CN106330373B - Synchronization method and device in a jammer, jammer - Google Patents

Abstract

The invention discloses a synchronization method in a jammer. The method includes: tracking a synchronization signal on a reference frequency band to obtain the current frame header position of the reference frequency band; The time difference between the frame header position of the frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band determine the current frame header position of each frequency band; obtain the frame structure of each frequency band; The current frame header position and the corresponding frame structure send a synchronization control signal, and the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal. The invention also discloses a synchronization device and a jammer in the jammer.

Description

Synchronization method and device in a jammer, jammer

technical field

The present invention relates to jammer technology, in particular to a synchronization method and device in jammer, and jammer.

Background technique

In some sensitive places such as party and government organs or school examination rooms, it is necessary to block normal mobile phone communication in a specific area or place for the purpose of confidentiality. In this case, jammers are generally deployed near the target area. Figure 1 shows the existing The schematic diagram of the network architecture in the technology is shown in Figure 1. Generally speaking, the jammer 11 is a high-power wireless signal transmitter, and the jammer 11 continuously transmits high-power interference on the same downlink frequency as the base station 12. or noise signal. Therefore, the user equipment (UE) 13 in the target area 13 will also be strongly interfered by the jammer 11 while receiving the normal base station signal, so that the UE 13 cannot maintain normal downlink communication; In the other places 15, the interference signal generated by the jammer 11 is very weak, generally much weaker than the useful signal of the base station. Therefore, the UE 16 in these places can still maintain normal communication with the base station.

Fig. 2 shows a frame structure in a Time Division Long Term Evolution (Time Division Long Term Evolution, TD-LTE) system. As shown in Fig. 2, an LTE system adopts a sub-frame (Sub-frame) structure of equal length: Each subframe has a length of 1 millisecond (ms) and includes two time slots with a length of 0.5ms; 10 subframes constitute a radio frame (Radio Frame) with a length of 10ms. In a Time Division Duplexing (Time Division Duplexing, TDD) frame, some subframes are downlink and other subframes are uplink. According to the requirements of different coverage scenarios, in a radio frame of the TD-LTE system, the normal subframe (U) for uplink transmission, the normal subframe (D) for downlink transmission and the special subframe (S) may have different configurations. By adjusting the ratio of the number of uplink and downlink subframes, the TD-LTE system can meet the needs of different ratios of uplink and downlink data transmission services. Table 1 is a configuration table of uplink and downlink subframes used in the related art to reflect the allocation of resources in the TD-LTE time domain. As shown in Table 1, TD-LTE introduces special subframes (S subframes in the above table). In a TD-LTE frame, one or two special subframes are included for uplink and downlink conversion.

Table 1 Uplink and downlink subframe configuration table

Specifically, the special subframe is composed of three parts: a downlink pilot time slot (DwPTS, Downlink Pilot Time Slot), a guard interval (GP, Guard Period) and an uplink pilot time slot (UpPTS, Uplink Pilot Time Slot). TD-LTE uses the guard interval GP as a price to enable simultaneous uplink and downlink transmission on the same frequency band, and its function is similar to the uplink and downlink frequency guard interval of the FDD system. TD-LTE transmits primary synchronization channel (PSS) on DwPTS, and the remaining resources can be used for downlink data transmission; in TD-LTE, UpPTS can carry random access channel and uplink signal quality estimation channel. Table 2 shows the configuration table of a special subframe. As shown in Table 2, the special time slot of TD-LTE has various configuration methods. The length of DwPTS, GP, and UpPTS can be changed to adapt to coverage, capacity, interference, etc. needs of different scenarios.

Table 2 Configuration table of special subframes

The channel mapping relationship of TD-LTE is shown in Figure 3. Taking a TD-LTE system with a bandwidth of 5MHz and a subframe ratio of 1.2 as an example, the PBCH is placed on the middle 6 resource blocks (RBs), and the physical downlink control channel ( Physical Downlink Control Channel, PDCCH) is placed on the first N (N≤3) orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols of each subframe.

In an FDD system such as the Global System for Mobile Communication (GSM) system, the uplink and downlink work continuously on different frequencies, for example, the downlink works at f1, the uplink works at f2, and the above-mentioned jammers are on the downlink frequency. It also continuously transmits interference signals, which can achieve the deployment goal, that is, only interfere with users in the target area, while other users in the cell can still communicate normally. For the TDD system (such as the TD-LTE system), since both the uplink and the downlink work on the same frequency point (such as the f1 frequency point), as shown in FIG. 4 , in the uplink time slot, the uplink receiver of the base station 12 is turned on and receives the UE. 13 sends the uplink signal on f1; however, at this time, the jammer 11 is still sending the interference signal on the f1 frequency point, so it will inevitably affect the uplink receiver and uplink reception performance of the base station, thus affecting the whole Normal communication of all users in the cell.

In view of the problems described in the background art, an improved jammer transmission method is proposed in the prior art. In this method, the jammer is silent in the uplink subframe, and only transmits the jamming signal in the downlink subframe, so as to avoid the transmission of the jammer to the base station. Upstream interference. However, in order to implement this method, after the jammer is synchronized with the target TD-LTE system, the current subframe direction, that is, the uplink subframe or the downlink subframe, is determined according to the known uplink and downlink subframe ratio.

However, the key parameter of the uplink and downlink subframe allocation information in the above scheme is almost difficult to obtain during the specific implementation process, because the uplink and downlink subframe allocation information is carried in the broadcast channel of LTE, and it is necessary to adjust the broadcast channel. This information can only be obtained by performing demodulation, but the demodulation function based on a general-purpose digital chip is generally complicated and expensive. In addition, there are also the following difficulties in the actual acquisition process of the uplink and downlink subframe ratios: In China, the TD-LTE system works in multiple frequency bands, such as F-band (1885-1915MHz), E-band (2320MHz) –2370MHz), D-band (2575–2615MHz). In the current actual network, the frame header positions of the TD-LTE systems on multiple frequency bands (the starting position of a 10ms radio frame in time) may be aligned or different. This causes great difficulties to the synchronization process of the TD-LTE jammer. The reasons are as follows: The synchronization between the TD-LTE jammer and the TD-LTE system can realize silence in the uplink phase to protect the uplink reception of the base station. Considering the clock drift of the crystal oscillator, the jammer needs to continuously track the downlink synchronization signal of the TD-LTE system in order to perform time-domain and frequency-domain deviation correction. However, if the frame headers of the TD-LTE system between multiple frequency bands are out of synchronization, it will be difficult to synchronize the tracking processing of the jammer, because at this time, the jammer needs to scan back and forth between multiple frequency bands in order to track and synchronize multiple frequency bands at the same time. TD-LTE system on a frequency band.

SUMMARY OF THE INVENTION

In view of this, in order to solve at least one problem existing in the prior art, the embodiments of the present invention provide a synchronization method and device in a jammer, and a jammer, which can avoid causing the uplink receiver and uplink reception performance of the base station to be affected. Therefore, the normal communication of all users in the whole cell is not affected.

The technical solution of the embodiment of the present invention is realized as follows:

In a first aspect, an embodiment of the present invention provides a synchronization method in a jammer, the method comprising:

Track the synchronization signal on the reference frequency band to obtain the current frame header position of the reference frequency band;

Determine the current frame header position of each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band in the communication system supported by the jammer and the current frame header position of the reference frequency band;

Get the frame structure of each frequency band;

According to the current frame header position of each frequency band and the corresponding frame structure, a synchronization control signal is sent, and the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

In a second aspect, an embodiment of the present invention provides a synchronization device in a jammer, the device includes a tracking unit, a determination unit, an acquisition unit, and a transmission unit, wherein:

the tracking unit, configured to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band;

The determining unit is configured to determine each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer. The current frame header position of the frequency band;

The obtaining unit is used to obtain the frame structure of each frequency band;

The sending unit is configured to send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

In a third aspect, an embodiment of the present invention provides a jammer, the jammer includes a processor and a transmit chain, wherein

The processor is used to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band; and is used for the frame header position and the reference frequency in each frequency band of the communication system supported by the jammer. The time difference between the frame header positions of the frequency bands and the current frame header position of the reference frequency band determines the current frame header position of each frequency band; it is used to obtain the frame structure of each frequency band; it is used to obtain the frame structure of each frequency band according to the current frame header of each frequency band the position and the corresponding frame structure, and send a synchronization control signal, the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal;

The transmission link is used for transmitting an interference signal according to the synchronization control signal.

Embodiments of the present invention provide a synchronization method and device in a jammer, and a jammer, wherein a synchronization signal on a reference frequency band is tracked to obtain the current frame header position of the reference frequency band; according to the communication system supported by the jammer Determine the current frame header position of each frequency band based on the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band; obtain the frame structure of each frequency band; The current frame header position of a frequency band and the corresponding frame structure send a synchronization control signal, and the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal; in this way, the uplink reception of the base station can be avoided. This will not affect the normal communication of all users in the whole cell.

Description of drawings

1 is a schematic diagram 1 of a network architecture of a TDD system in the prior art;

2 is a schematic diagram of a frame structure in a TD-LTE system in the related art;

3 is a schematic diagram of a channel mapping relationship of TD-LTE in the related art;

4 is a schematic diagram 2 of a network architecture of a TDD system in the prior art;

FIG. 5 is a schematic flowchart of the implementation of a synchronization method in a jammer according to Embodiment 1 of the present invention;

FIG. 6 is a schematic flowchart of the implementation of the synchronization method in the jammer according to the second embodiment of the present invention;

7 is a schematic diagram of the composition and structure of a synchronization device in a jammer according to Embodiment 3 of the present invention;

8 is a schematic diagram of the composition and structure of a synchronization device in a jammer according to Embodiment 4 of the present invention;

9 is a schematic diagram of the composition and structure of a synchronization device in a jammer according to Embodiment 5 of the present invention;

Fig. 10-1 is a schematic diagram 1 of the composition structure of the jammer according to the fifth embodiment of the present invention;

Fig. 10-2 is a schematic diagram 2 of the composition structure of the jammer according to the fifth embodiment of the present invention;

Fig. 10-3 is a schematic diagram 3 of the composition structure of the jammer according to the fifth embodiment of the present invention;

Fig. 10-4 is a schematic diagram 4 of the composition structure of the jammer according to the fifth embodiment of the present invention;

Fig. 10-5 is a schematic diagram 5 of the composition structure of the jammer according to the fifth embodiment of the present invention;

FIG. 11 is a schematic flowchart of the implementation of the synchronization method in the jammer according to the eleventh embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be further elaborated below with reference to the accompanying drawings and specific embodiments.

Example 1

An embodiment of the present invention provides a synchronization method in a jammer. The method is applied to a jammer. The functions implemented by the method can be implemented by calling a program code by a processor in the jammer. Of course, the program code can be stored in a computer storage medium. , it can be seen that the jammer includes at least a processor and a storage medium.

FIG. 5 is a schematic flowchart of the implementation of the synchronization method in the jammer according to the first embodiment of the present invention. As shown in FIG. 5 , the synchronization method in the jammer includes:

Step 501, track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band;

Here, the reference frequency band is one or more frequency bands in the communication system supported by the jammer. For the convenience of implementation, in this embodiment and the following embodiments, the reference frequency band is taken as an example. Yes, the base station in the communication system needs to use this frequency band to transmit synchronization signals. Although some frequency bands are supported by the communication system, but the communication system does not use this frequency band to work, then if the reference frequency band is set to the frequency band where the communication system does not work , then it will not be possible to lock the reference band to track the synchronization signal on the reference band. In this embodiment and the following embodiments, the synchronization signal may be a downlink synchronization signal sent by the base station to the UE, and the jammer implements interference to the UE by searching for the downlink synchronization signal sent by the base station.

Here, the current frame header position of the reference frequency band refers to the frame header position of the current reference frequency band, wherein the frame header position is also called the frame header signal position.

Step 502: Determine the current frame of each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer head position;

Here, the time difference may be pre-stored, or may be determined or calculated in real time; it should be noted that real-time determination or calculation will consume the resources of the jammer. Therefore, after the jammer is powered on, the jammer will first Some steps are performed in order to obtain the time difference and store the time difference in advance. Based on the background art, the reason for acquiring the time difference is that the positions of the frame headers on multiple frequency bands of the communication system may be aligned or may be different. Moreover, the clock of the crystal oscillator in the jammer will also drift, so the current frame header position of each frequency band cannot be accurately known. It should be noted that even if the crystal oscillator always drifts, the time difference between the frame header positions between the frequency bands is indeed fixed. Therefore, in order to solve this problem, in each embodiment of the present invention, the reference frequency band will be locked, and the Calculate the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band to obtain the current frame header position of each frequency band.

Step 503, obtaining the frame structure of each frequency band;

Here, those skilled in the art can obtain the frame structure on each frequency band according to various existing technologies.

Step 504: Send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

The synchronization method in the jammer provided by the embodiment of the present invention is suitable for a general communication system, and is especially suitable for a communication system in which the uplink frequency band and the downlink frequency band have overlapping frequency bands. As an extreme example, the synchronization method is suitable for the uplink frequency band and the downlink frequency band. A fully coincident or overlapping Time Division Long Term Evolution (TD-LTE) communication system.

In the embodiment of the present invention, the synchronization signal on the reference frequency band is tracked to obtain the current frame header position of the reference frequency band; according to the frame header position of each frequency band and the frame header position of the reference frequency band of the communication system supported by the jammer The time difference between the time difference and the current frame header position of the reference frequency band, determine the current frame header position of each frequency band; obtain the frame structure of each frequency band; send synchronization according to the current frame header position of each frequency band and the corresponding frame structure control signal, the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal; in this way, the technical solution provided by the embodiment of the present invention can make the jammer adapt well and work stably in multiple frequency bands on a scene where the frame headers are out of sync. As mentioned above, if the frame headers are out of sync between multiple frequency bands, it will be difficult to process the synchronous tracking of the jammer. Based on the technical solution of the present invention, the jammer can be stably locked on a certain frequency band. Synchronize the tracking process, and calculate the frame header position on each frequency band by measuring the saved frame header position time difference on different frequency bands in advance, thereby solving the above problems. The uplink reception performance is affected, so that the normal communication of all users in the entire cell is not affected.

Embodiment 2

Based on the foregoing first embodiment, an embodiment of the present invention provides a synchronization method in a jammer. The method is applied to a jammer, and the functions implemented by the method can be implemented by calling a program code by a processor in the jammer. Of course, the program The code can be stored in a computer storage medium, and it can be seen that the jammer includes at least a processor and a storage medium.

FIG. 6 is a schematic flowchart of the implementation of the synchronization method in the jammer according to the second embodiment of the present invention. As shown in FIG. 6 , the synchronization method in the jammer includes:

Step 601, after the jammer is powered on, control the transmission link of the jammer to remain in a closed state;

Here, in addition to the processor, the jammer also includes a transmission link for transmitting interference signals. After the jammer is powered on, the processor first controls the transmission link to be in a closed state, so that the transmission link cannot transmit interference signals.

Step 602, searching for synchronization signals on each frequency band of the communication system, and recording the frame header position of each frequency band;

Step 603: Obtain the frame header position of a reference frequency band, where the reference frequency band is a frequency band supported by the communication system;

Here, the reference frequency band may be preset. Taking the TD-LTE system as an example, the frequency bands supported by the TD-LTE system include the D frequency band, the F frequency band, and the E frequency band. Those skilled in the art can set any frequency band as the reference frequency band.

Step 604, determining the time difference between the frame header position of the reference frequency band and the frame header position of each frequency band;

Step 605: Track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band;

Step 606: Determine the current frame of each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer head position;

Here, the time difference may be pre-stored, or may be determined or calculated in real time; it should be noted that real-time determination or calculation will consume the resources of the jammer. Therefore, after the jammer is powered on, the jammer will first Some steps are performed in order to obtain the time difference and store the time difference in advance. Based on the background art, the reason for acquiring the time difference is that the positions of the frame headers on multiple frequency bands of the communication system may be aligned or may be different. Moreover, the clock of the crystal oscillator in the jammer will also drift, so the current frame header position of each frequency band cannot be accurately known. It should be noted that even if the crystal oscillator always drifts, the time difference between the frame header positions between the frequency bands is indeed fixed. Therefore, in order to solve this problem, in each embodiment of the present invention, the reference frequency band will be locked, and the Calculate the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band to obtain the current frame header position of each frequency band.

Step 607, acquiring the frame structure of each frequency band;

Here, those skilled in the art can obtain the frame structure on each frequency band according to various existing technologies.

Step 608: Send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

A method for implementing step 602 is provided here. Specifically, in step 602, the searching for synchronization signals on each frequency band of the communication system, and recording the frame header position of each frequency band, includes:

Step 6021, search the frequency points on each frequency band one by one;

Step 6022, when the synchronization signal is searched on the frequency point, record the frame header position of the frequency point as the frame header position of the frequency band;

Step 6023, when a synchronization signal is found on the frequency point, stop searching for the synchronization signal on other frequency points in the frequency band.

It should be noted that, in addition to the above-mentioned method for searching the synchronization signal of each frequency band, those skilled in the art can use various existing technologies to implement step 602, which will not be repeated here.

In this embodiment of the present invention, when no synchronization signal is found on all frequency points in the frequency band, a first search result is recorded, and the first search result is used to indicate that no synchronization signal is found in the frequency band . The method according to the embodiment of the present invention further includes: according to the first search result, not sending a synchronization control signal on the frequency band.

Embodiment 3

Based on the foregoing embodiments, the embodiments of the present invention provide a synchronization device in a jammer. The tracking unit, the determining unit, the acquiring unit, and the sending unit in the device can all be implemented by a processor in the jammer; It is implemented by a specific logic circuit; in the process of the specific embodiment, the processor may be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP) or a field programmable gate array (FPGA), etc. .

FIG. 7 is a schematic diagram of the composition and structure of the synchronization device in the jammer according to the third embodiment of the present invention. As shown in FIG. 7 , the device 700 includes a tracking unit 701, a determination unit 702, an acquisition unit 703 and a transmission unit 704, wherein:

The tracking unit 701 is configured to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band;

The determining unit 702 is configured to determine each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer. The current frame header position of a frequency band;

The obtaining unit 703 is configured to obtain the frame structure of each frequency band;

The sending unit 704 is configured to send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

In the embodiment of the present invention, the tracking unit 701 tracks the synchronization signal on the reference frequency band, and obtains the current frame header position of the reference frequency band; the determining unit 702 determines according to the frame header position of the communication system supported by the jammer in each frequency band and The time difference between the frame header positions of the reference frequency band and the current frame header position of the reference frequency band determines the current frame header position of each frequency band; the obtaining unit 703 obtains the frame structure of each frequency band; The current frame header position and the corresponding frame structure send a synchronization control signal, and the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal; in this way, the technical solution provided by the embodiment of the present invention can make the jammer The controller adapts well and works stably on multiple frequency bands where the frame headers are out of sync. As mentioned above, if the frame headers are out of sync between multiple frequency bands, it will be difficult to process the synchronous tracking of the jammer. Based on the technical solution of the present invention, the jammer can be stably locked on a certain frequency band. Synchronize the tracking process, and calculate the frame header position on each frequency band by measuring the saved frame header position time difference on different frequency bands in advance, thereby solving the above problems. The uplink reception performance is affected, so that the normal communication of all users in the entire cell is not affected.

It should be pointed out here that the descriptions of the above apparatus embodiments are similar to the descriptions of the above method embodiments, and have similar beneficial effects to those of the method embodiments, so they will not be repeated. For the technical details that are not disclosed in the apparatus embodiments of the present invention, please refer to the description of the method embodiments of the present invention for understanding, and to save space, therefore, no further descriptions will be given.

Embodiment 4

Based on the foregoing embodiments, the embodiments of the present invention provide a synchronization device in a jammer. In the device, a forming unit, a tracking unit, a determining unit, an acquiring unit, and a transmitting unit, and each module included in each unit, each module has its own Each sub-module included can be realized by the processor in the jammer; of course, it can also be realized by a specific logic circuit; in the process of the specific embodiment, the processor can be a central processing unit, a microprocessor, a digital Signal processor or field programmable gate array, etc.

FIG. 8 is a schematic diagram of the composition and structure of a synchronization device in a jammer according to Embodiment 4 of the present invention. As shown in FIG. 8 , the device 800 includes a forming unit 801, a tracking unit 802, a determining unit 803, an obtaining unit 804, and a sending unit 805, wherein The forming unit 801 further includes a control module 8011, a search module 8012, an acquisition module 8013 and a determination module 8014, wherein:

The control module 8011 is configured to control the transmission link of the jammer to remain in a closed state;

The search module 8012 is configured to search for synchronization signals on each frequency band of the communication system, and record the frame header position of each frequency band;

The obtaining module 8013 is configured to obtain the frame header position of a reference frequency band, where the reference frequency band is a frequency band supported by the communication system;

The determining module 8014 is configured to determine the time difference between the frame header position of the reference frequency band and the frame header position of each frequency band.

The tracking unit 802 is configured to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band;

The determining unit 803 is configured to determine each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer. The current frame header position of a frequency band;

The obtaining unit 804 is configured to obtain the frame structure of each frequency band;

The sending unit 805 is configured to send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

It should be pointed out here that the descriptions of the above apparatus embodiments are similar to the descriptions of the above method embodiments, and have similar beneficial effects to those of the method embodiments, so they will not be repeated. For the technical details that are not disclosed in the apparatus embodiments of the present invention, please refer to the description of the method embodiments of the present invention for understanding, and to save space, therefore, no further descriptions will be given.

Embodiment 5

Based on the foregoing embodiments, the embodiments of the present invention provide a synchronization device in a jammer. In the device, a forming unit, a tracking unit, a determining unit, an acquiring unit, and a transmitting unit, and each module included in each unit, each module has its own Each sub-module included can be realized by the processor in the jammer; of course, it can also be realized by a specific logic circuit; in the process of the specific embodiment, the processor can be a central processing unit, a microprocessor, a digital Signal processor or field programmable gate array, etc.

FIG. 9 is a schematic diagram of the composition and structure of a synchronization device in a jammer according to Embodiment 4 of the present invention. As shown in FIG. 9 , the device 800 includes a forming unit 801, a tracking unit 802, a determining unit 803, an obtaining unit 804, a sending unit 805, and a processing unit 800. Unit 806, wherein the forming unit 801 further includes a control module 8011, a search module 8012, an acquisition module 8013 and a determination module 8014, wherein the search module 8012 includes a search submodule 8121, a first record submodule 8122, a stop submodule 8123 and a second record Submodule 8124, where:

The control module 8011 is configured to control the transmission link of the jammer to remain in a closed state;

The search sub-module 8121 is used to search the frequency points on each frequency band one by one;

The recording sub-module 8122 is configured to record the frame header position of the frequency point as the frame header position of the frequency band when a synchronization signal is found on the frequency point.

The stop sub-module 8123 is configured to stop searching for synchronization signals on other frequency points in the frequency band when a synchronization signal is found on the frequency point.

The second recording sub-module 8124 is configured to record the first search result when no synchronization signal is found on all the frequency points on the frequency band, and the first search result is used to indicate that the frequency is on the frequency band No sync signal found.

The obtaining module 8013 is configured to obtain the frame header position of a reference frequency band, where the reference frequency band is a frequency band supported by the communication system;

The determining module 8014 is configured to determine the time difference between the frame header position of the reference frequency band and the frame header position of each frequency band.

The tracking unit 802 is configured to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band;

The determining unit 803 is configured to determine each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer. The current frame header position of a frequency band;

The obtaining unit 804 is configured to obtain the frame structure of each frequency band;

The sending unit 805 is configured to send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal.

The processing unit 806 is configured to not send a synchronization control signal on the frequency band according to the first search result.

It should be pointed out here that the descriptions of the above apparatus embodiments are similar to the descriptions of the above method embodiments, and have similar beneficial effects to those of the method embodiments, so they will not be repeated. For the technical details that are not disclosed in the apparatus embodiments of the present invention, please refer to the description of the method embodiments of the present invention for understanding, and to save space, therefore, no further descriptions will be given.

Embodiment 6

Based on the foregoing embodiments, an embodiment of the present invention further provides a jammer. FIG. 10-1 is a schematic diagram of the composition and structure of the jammer according to the tenth embodiment of the present invention. As shown in FIG. 10-1, the jammer 1000 includes a processor 1001 and transmit chain 1002, where

The processor 1001 is configured to track the synchronization signal on the reference frequency band and obtain the current frame header position of the reference frequency band; and is configured to match the frame header position of each frequency band with the frame header position of the communication system supported by the jammer. The time difference between the frame header positions of the reference frequency band and the current frame header position of the reference frequency band determines the current frame header position of each frequency band; it is used to obtain the frame structure of each frequency band; it is used to obtain the frame structure of each frequency band according to the current frame of each frequency band. The header position and the corresponding frame structure, sending a synchronization control signal, the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal;

The transmission link 1002 is configured to transmit an interference signal according to the synchronization control signal.

In this embodiment of the present invention, as shown in FIG. 10-2, the jammer further includes a first antenna 1003, which is used for transmitting an interference signal and searching for a synchronization signal.

In this embodiment of the present invention, as shown in FIG. 10-3, the jammer further includes a second antenna 1004 and a third antenna 1005, where:

the second antenna, used for searching for synchronization signals;

The third antenna is used to transmit interference signals.

It should be pointed out here that the description of the above-mentioned jammer embodiment item is similar to the description of the above-mentioned method, and has the same beneficial effects as the method embodiment, so it is not repeated. For the technical details not disclosed in the embodiments of the jammer of the present invention, those skilled in the art should refer to the description of the method embodiments of the present invention to understand, and to save space, they will not be repeated here.

It should be noted that, in the several embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other manners. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, the interference shown in Figure 10-1 above The structure of the device can also adopt the structure shown in Figures 10-4 and 10-5. The jammer is mainly composed of an antenna, a transmission chain and a synchronization control unit. The synchronization control unit and the transmission chain can pass through the combiner. Combine the circuits, so as to share the antenna (see Figure 10-4), or not share the antenna (see Figure 10-5), wherein, the combiner can be implemented by using various existing technologies, and the synchronization control unit is implemented in the specific implementation. In the process, it can be implemented based on a physical hardware processor.

Embodiment 11

Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization method in a jammer. In the embodiment of the present invention, the TD-LTE system will be used as an example to illustrate the technical solution of the embodiment of the present invention. FIG. 11 is a schematic flowchart of the implementation of the synchronization method in the jammer according to the eleventh embodiment of the present invention, as shown in FIG. 11 . , the method includes:

Step 1101, initial power-on;

Step 1102, the jammer keeps silent, acquires a supported frequency band, and the synchronization control unit searches for synchronization signals of all TD-LTE frequency points on the frequency band;

Here, after power-on, the jammer has not started searching, so get the first frequency band from the supported frequency bands to start searching. Specifically, the transmission link in the jammer is kept in a closed state, and starting from the first frequency band supported, the synchronization control unit searches for synchronization signals of all TD-LTE frequency points on the first frequency band.

Step 1103, whether a synchronization signal is found on any frequency point;

Specifically, whether synchronization information is searched on any frequency point in the frequency band, if yes, go to step 1104, if not, go to step 1105;

Step 1104, the synchronization control unit records the position of the frame header signal of this frequency band, and can decide whether to continue searching for other frequency points according to the interference scheme;

Step 1105, the synchronization control unit records the search result of this frequency band, and identifies that there is no TD-LTE system in this frequency band;

Step 1106, determine whether all frequency bands have been searched, if yes, go to Step 1107, if no, go to Step 1102;

Specifically, step 1102 acquires the next frequency band, starts to search all frequency points in the frequency band, and then proceeds to step 1103, and repeats this cycle until all frequency bands are searched.

Step 1107, the synchronization control unit calculates and saves the frame header time difference between the frequency band of the TD-LTE system and the reference frequency band;

Step 1108, the synchronization control unit is locked to the reference frequency band, and outputs a synchronization control signal;

Step 1109, the frame header positions on other frequency bands are adjusted accordingly according to the frame header positions of the reference frequency band and the pre-calculated frame header time difference.

Embodiment 12

Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization method in a jammer. In the embodiment of the present invention, a TD-LTE system will be used as an example to illustrate the technical solution of the embodiment of the present invention, and the method includes:

Step S1101, at the beginning of power-on, the transmission link in the jammer is kept in a closed state, and the synchronization control unit starts to scan and search for TD-LTE system synchronization signals on all frequency points of all TD-LTE system frequency bands supported by the jammer in turn. ; then go to step S1102.

Here, in the process of scanning all the frequency points on the frequency band of the TD-LTE system, two schemes can be adopted. Considering that the existing network generally only works on a few fixed frequency points, according to the actual system configuration of the existing network, search can be performed on several fixed frequency points in each frequency band to speed up the scanning process.

Step S1102, determine whether there are other unsearched frequency bands in the TD-LTE system, if yes, go to step S1103, if no, go to step S1106;

Step S1103, for a certain frequency band, search for TD-LTE system synchronization signals on all frequency points on the frequency band; for a frequency band, if a synchronization signal is searched on a certain frequency point in this frequency band, then enter step S1104; If the synchronization signal is still not detected after all the frequency points of this frequency band are searched, then go to step S1105.

Step S1104, the synchronization control unit records the frame header position of this frequency band;

For example, the frame header position of the first frequency band is denoted as S1. Note that even if the TD-LTE synchronization signal is searched on multiple frequencies in this frequency band, since the TD-LTE system on multiple frequencies in the same frequency band must require frame header alignment and synchronization, for one frequency band, there will only be A frame header position. After that, for other frequency points on this frequency band, you can decide whether to continue the search according to the interference working principle of the jammer:

When the jammer works in a fixed broadband jamming mode, such as sending a 60MHz broadband jamming signal in the D frequency band, or sending a single-tone scan signal at a fixed bandwidth of 60MHz, you can go directly to the step without searching for other frequency points. S1102, start searching for the next frequency band.

When the jammer works in a variable bandwidth jamming mode, such as supporting the transmission of 20MHz jamming signals, an optimal solution is to continue to search all frequency points and record the search results on each frequency point for subsequent use. When transmitting the interference signal, the synchronization control unit can control the jammer to only transmit the interference signal on the corresponding frequency point where the TD-LTE system exists according to the search result on each frequency point. For example, for the D frequency band, if the synchronization control unit only searches for a TD-LTE signal on the frequency point of 2585MHz, the synchronization control unit can control the jammer to select only the center frequency of 2585MHz to send an interference signal with a bandwidth of 20MHz. After that, go to step S1102 to start searching for the next frequency band.

Step S1105, if the TD-LTE synchronization signal is not found on all the frequency points of this frequency band, the synchronization control unit records the search result of this frequency band for subsequent processing. After that, go to step S1102 to start searching for the next frequency band.

If there is no TD-LTE signal in this frequency band, when subsequent jammers transmit jamming signals, the synchronization control unit can control the jammer to remain silent in this frequency band and not transmit jamming signals; or the synchronization control unit can also choose to control the jammer After determining the frame header position and the TD-LTE frame structure according to the preset default parameters on this frequency band, the interference signal is transmitted.

Step S1106, the synchronization control unit calculates and saves the frame header positions of all other frequency bands relative to this given frame head position based on the frame head positions recorded on all frequency bands searched for the TD-LTE system, and takes the frame head position of a given frequency band as a reference. The time difference between the position of the frame header of the band.

For example, if the TD-LTE positions are searched on the F, E, and D frequency bands, the frame header positions are S1, S2, and S3 respectively. Assuming that the frame header position of the D frequency band is used as the reference, the frame headers between different frequency bands are calculated and saved. The relative time difference of positions (referred to as time difference), for example, the time difference Offset1=S1-S3 of the frame header position of the F relative to the D frequency band, and the time difference Offset2 of the frame header position of the E relative to the D frequency band Offset2=S2-S3. Then, it progresses to step S1107.

Step S1107, the synchronization control unit is locked to a certain frequency of the reference frequency band that is searched for the TD-LTE system, continues to track and detect the synchronization signal, and performs time domain and frequency domain deviation correction to obtain the current frame header position of the reference frequency band;

Step S1108, according to the current frame header position of the reference frequency band and the time difference determined in step S1106, calculate the current frame header position on each frequency band;

Step S1109, when the jammer is ready to interfere with the TD-LTE system on the reference frequency band, the frame header position of the TD-LTE system is determined according to the synchronization control signal output by the synchronization control unit, and the transmission is started according to the determined TD-LTE frame structure. interfering signal;

When the jammer is ready to interfere with the TD-LTE system on other frequency bands, the synchronization control unit can still lock on the reference frequency band, continuously output the synchronization control signal, and according to the relative time difference of the frame header positions between different frequency bands saved in step S1106 , considering that the relative time difference is generally fixed, the frame header position of the TD-LTE system on this frequency band can be determined based on this calculation, and the interference signal can be sent according to the determined TD-LTE frame structure.

It should be emphasized that, before step S1109, the jammer should always be in a silent state and not transmit jamming signals. In addition, when the synchronization control module is not synchronized or out of synchronization, the jammer signal transmission chain of the jammer should also be kept closed.

It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, rather than the embodiments of the present invention. implementation constitutes any limitation. The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages or disadvantages of the embodiments.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the coupling, or direct coupling, or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical or other forms. of.

The unit described above as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit; it may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may all be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integration The unit can be implemented either in the form of hardware or in the form of hardware plus software functional units.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by program instructions related to hardware, the aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, the execution includes: The steps of the above method embodiments; and the aforementioned storage medium includes: a removable storage device, a read only memory (Read Only Memory, ROM), a magnetic disk or an optical disk and other media that can store program codes.

Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of software products in essence or the parts that make contributions to the prior art. The computer software products are stored in a storage medium and include several instructions for A computer device (which may be a personal computer, a server, or a network device, etc.) is caused to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a removable storage device, a ROM, a magnetic disk, or an optical disk.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (16)

1. A synchronization method in a jammer, wherein the method comprises: tracking the synchronization signal on the reference frequency band to obtain the current frame header position of the reference frequency band; wherein the reference frequency band is used to determine the synchronization signal, so that the jammer generates an interference signal based on the synchronization signal; Determine the current frame header position of each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band in the communication system supported by the jammer and the current frame header position of the reference frequency band; Get the frame structure of each frequency band; According to the current frame header position of each frequency band and the corresponding frame structure, a synchronization control signal is sent, and the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal. 2 . The method according to claim 1 , wherein the uplink frequency band of the communication system and the downlink frequency band of the communication system have overlapping frequency bands. 3 . 3. The method according to claim 2, wherein the communication system is a time-sharing long-term evolution TD-LTE communication system. 4. The method according to claim 1, wherein the time difference is obtained in the following manner: controlling the transmission link of the jammer to remain closed; searching for synchronization signals on each frequency band of the communication system, and recording the frame header position of each frequency band; obtaining the frame header position of the reference frequency band, where the reference frequency band is a frequency band supported by the communication system; A time difference between the frame header position of the reference frequency band and the frame header position of each frequency band is determined. 5. The method according to claim 4, wherein the searching for a synchronization signal on each frequency band of the communication system, and recording the frame header position of each frequency band, comprises: Search the frequency points on each frequency band one by one; When a synchronization signal is found on the frequency point, the frame header position of the frequency point is recorded as the frame header position of the frequency band. 6. The method according to claim 5, wherein the searching for a synchronization signal on each frequency band of the communication system, and recording the frame header position of each frequency band, further comprises: When a synchronization signal is found in the frequency point, the search for synchronization signals in other frequency points in the frequency band is stopped. 7. The method according to claim 6, wherein the searching for a synchronization signal on each frequency band of the communication system, and recording the frame header position of each frequency band, further comprises: When no synchronization signal is found on all frequency points in the frequency band, a first search result is recorded, and the first search result is used to indicate that no synchronization signal is found in the frequency band. 8. The method according to claim 7, wherein the method further comprises: According to the first search result, no synchronization control signal is sent on the frequency band. 9. A synchronization device in a jammer, wherein the device comprises a tracking unit, a determination unit, an acquisition unit and a transmission unit, wherein: The tracking unit is configured to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band; wherein, the reference frequency band is used to determine the synchronization signal, so that the jammer generates the synchronization signal based on the synchronization signal interfering signal; The determining unit is configured to determine each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer. The current frame header position of the frequency band; The obtaining unit is used to obtain the frame structure of each frequency band; The sending unit is configured to send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, where the synchronization control signal is used to control the transmission link in the jammer to transmit the jamming signal. 10. The device according to claim 9, wherein the device further comprises: a forming unit, the forming unit further comprises a control module, a search module, an acquisition module and a determination module, wherein: the control module, configured to control the transmission link of the jammer to remain in a closed state; The search module is configured to search for synchronization signals on each frequency band of the communication system, and record the frame header position of each frequency band; the obtaining module, configured to obtain the frame header position of the reference frequency band, where the reference frequency band is a frequency band supported by the communication system; The determining module is configured to determine the time difference between the frame header position of the reference frequency band and the frame header position of each frequency band. 11. The device according to claim 10, wherein the search module comprises a search sub-module and a first record sub-module, wherein: The search submodule is used to search the frequency points on each frequency band one by one; The recording submodule is configured to record the frame header position of the frequency point as the frame header position of the frequency band when a synchronization signal is searched on the frequency point. 12. The apparatus according to claim 11, wherein the search module further comprises a stop submodule and a second record submodule, wherein: The stop submodule is configured to stop searching for synchronization signals on other frequency points on the frequency band when a synchronization signal is searched on the frequency point; The second recording submodule is configured to record a first search result when no synchronization signal is found on all frequency points on the frequency band, and the first search result is used to indicate that there is no synchronization signal on the frequency band. Sync signal is found. 13 . The apparatus according to claim 12 , wherein the apparatus further comprises a processing unit, configured to not send a synchronization control signal on the frequency band according to the first search result. 14 . 14. A jammer comprising a processor and a transmit chain, wherein the processor is configured to track the synchronization signal on the reference frequency band, and obtain the current frame header position of the reference frequency band; wherein, the reference frequency band is used to determine the synchronization signal, so that the jammer generates the synchronization signal based on the reference frequency band Interfering signal; used to determine the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band and the current frame header position of the reference frequency band according to the communication system supported by the jammer to determine the frequency of each frequency band. Current frame header position; used to obtain the frame structure of each frequency band; used to send a synchronization control signal according to the current frame header position of each frequency band and the corresponding frame structure, and the synchronization control signal is used to control the transmits the interfering signal; The transmission chain is used for transmitting the interference signal according to the synchronization control signal. 15. The jammer according to claim 14, wherein the jammer further comprises a first antenna for transmitting the jamming signal and searching for the synchronization signal. 16. The jammer of claim 14, wherein the jammer further comprises a second antenna and a third antenna, wherein: the second antenna, used for searching for synchronization signals; The third antenna is used for transmitting interference signals.

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