CN115118351B - Digital signal processing method, electronic reconnaissance equipment and electronic reconnaissance system - Google Patents
Digital signal processing method, electronic reconnaissance equipment and electronic reconnaissance system Download PDFInfo
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Abstract
The invention discloses a digital signal processing method, electronic reconnaissance equipment and an electronic reconnaissance system, which are applied to the field of electronic reconnaissance; the digital signal processing method is applied to electronic reconnaissance equipment and comprises the following steps: dividing a current channel into a plurality of sub-channel units with preset bandwidths; receiving a first digital signal, and acquiring the frequency, bandwidth and quantity of the first digital signal; determining the number of corresponding sub-channel units according to the frequency, the bandwidth and the number of the first digital signal, and re-fusing the sub-channel units with the corresponding number to obtain a channel matched with the frequency, the bandwidth and the number of the first digital signal; and filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to the system chip through a channel obtained by fusion so that the system chip can output the second digital signal to the terminal server. The invention solves the problem of low frequency spectrum utilization efficiency of the electronic reconnaissance equipment.
Description
Technical Field
The present invention relates to the field of electronic reconnaissance, and in particular, to a digital signal processing method, an electronic reconnaissance device, and an electronic reconnaissance system.
Background
For the field of electronic countermeasure, signals in 0.1GHz to 2GHz frequency bands are dense, radar signals and communication signals are provided, and various special electronic signals such as IFF signals, ADS-B signals, navigation signals, data chain signals and the like for identifying enemies and peoples are provided, so that the electronic reconnaissance of the frequency bands is extremely high in intelligence value. However, the electromagnetic environment of the frequency band is complex, various signals are seriously interwoven, the reconnaissance, interception and independent operation of each signal in the existing electronic reconnaissance equipment and the utilization efficiency of the frequency spectrum of single equipment are low, so that the system-level integration is difficult to complete, the volume power consumption is large, the energy consumption ratio is extremely high, the miniaturization requirement of unmanned operation in the future cannot be met more and more, and the frequency band can not be popularized and used in a large number of military-to-civilian projects.
Disclosure of Invention
The invention mainly aims to provide a digital signal processing method, electronic reconnaissance equipment and an electronic reconnaissance system, and aims to solve the problem of low frequency spectrum utilization efficiency of the electronic reconnaissance equipment.
In order to achieve the above object, the present invention provides a digital signal processing method applied to an electronic reconnaissance device, the digital signal processing method comprising the steps of:
dividing a current channel into a plurality of sub-channel units with preset bandwidths;
receiving a first digital signal, and acquiring the frequency, bandwidth and quantity of the first digital signal;
determining the number of corresponding sub-channel units according to the frequency, the bandwidth and the number of the first digital signal, and re-fusing the sub-channel units with the corresponding number to obtain a channel matched with the frequency, the bandwidth and the number of the first digital signal;
and filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to a system chip through a channel obtained by fusion so that the system chip can output the second digital signal to a terminal server.
Optionally, the acquiring the frequency, the bandwidth, and the number of the first digital signal specifically includes:
acquiring the number of detection marks of the first digital signal;
determining the number of the first digital signals according to the number of the detection marks of the first digital signals;
amplifying the first digital signal by a preset threshold to obtain an amplified first digital signal;
comparing the amplified first digital signal with a plurality of preset thresholds;
when the amplified first digital signal is determined to be a real signal according to the comparison result, tracking the variation trend and the duration of the first digital signal;
and calculating the instantaneous frequency and the bandwidth of the first digital signal according to the variation trend and the duration of the first digital signal.
Optionally, the step of filtering the first digital signal to obtain a second digital signal specifically includes:
generating a corresponding filter according to the frequency and the bandwidth of the first digital signal;
and filtering the amplified first digital signal according to the generated filter to obtain the second digital signal.
Optionally, the determining that the amplified first digital signal is a true signal according to the comparison result includes:
and if the amplified first digital signal can pass through all preset thresholds, determining that the first digital signal is a real signal.
Optionally, the multiple preset thresholds include a constant false alarm detection threshold, an adaptive thermal noise threshold, a communication suppression threshold, and a dual tone automatic suppression threshold.
Optionally, the filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to a system chip through a channel obtained by fusion, so that the system chip outputs the second digital signal to a terminal server further includes:
calculating the amplitude, arrival time, frequency and phase of the second digital signal;
calculating a low confidence signal, a noise interference signal and a high probability false alarm signal in the second digital signal according to the amplitude, the arrival time, the frequency and the phase of the second digital signal;
filtering out low confidence signal, noise interference signal and large probability false alarm signal in the second digital signal;
and outputting the filtered second digital signal to a terminal server.
The invention also proposes an electronic reconnaissance device comprising:
the front-end frequency conversion assembly is used for receiving an external radio frequency signal, performing frequency conversion processing on the external radio frequency signal and outputting a first digital signal;
the input end of the acquisition processing assembly is connected with the output end of the front-end frequency conversion assembly, the acquisition processing assembly is further in communication connection with a terminal server, a signal processing program is stored in the acquisition processing assembly, and when the signal processing program is executed by the acquisition processing assembly, the digital signal processing method is realized.
Optionally, the front-end frequency conversion assembly includes:
the frequency selection component is used for selecting and outputting the external radio frequency signal with fixed frequency;
the input end of the low-noise amplifier component is connected with the output end of the frequency selection component, and the low-noise amplifier component is used for amplifying the external radio-frequency signal and then outputting the first digital signal to the acquisition processing component.
Optionally, the acquisition processing component includes:
the sampling chip is provided with a sampling end, and the sampling end of the sampling chip is used for collecting the first digital signal;
a memory storing the signal processing program;
a processor, an input end of the processor being connected to an output end of the sampling chip, the processor being further connected to the memory, the signal processing program, when executed by the processor, implementing the digital signal processing method as described above;
and the input end of the system chip is connected with the output end of the processor, the system chip is also in communication connection with the terminal server, and the system chip is used for outputting the second digital signal to the terminal server.
The invention also provides an electronic reconnaissance system which comprises the electronic reconnaissance equipment.
The technical scheme of the invention divides the current channel into a plurality of sub-channel units with preset bandwidth by adopting digital channelization operation, receives a first digital signal and acquires the frequency, the bandwidth and the number of the first digital signal; determining the number of corresponding sub-channel units according to the frequency, the bandwidth and the number of the first digital signal, and re-fusing the sub-channel units with the corresponding number to obtain a channel matched with the frequency, the bandwidth and the number of the first digital signal; then, the first digital signal is filtered to obtain a second digital signal, and the second digital signal is transmitted to the system chip through a channel matched with the bandwidth of the first digital signal, so that the system chip can output the second digital signal to the terminal server; according to the scheme, the most matched channel can be selected according to the specific bandwidth of the digital signal for signal processing, and then different types of signals in the first digital signal are respectively filtered and output, so that the matching degree of the current signal to be detected is improved, the resource overhead of a processing system cannot be additionally increased, and the power consumption of the electronic reconnaissance equipment during processing of a large amount of data is effectively reduced. The invention solves the problem of low frequency spectrum utilization efficiency of the electronic reconnaissance equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flowchart of method steps of a digital signal processing method according to an embodiment of the present invention;
FIG. 2 is a flowchart of method steps of another embodiment of a digital signal processing method according to the present invention;
FIG. 3 is a flowchart of method steps of a digital signal processing method according to another embodiment of the present invention;
FIG. 4 is a flowchart of method steps for a digital signal processing method according to yet another embodiment of the present invention;
fig. 5 is a schematic functional block diagram of an electronic scout apparatus according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Front end |
21 | |
| 11 | |
22 | Processor with a memory for storing a plurality of |
| 12 | Low-noise amplifier assembly | 23 | |
| 20 | |
24 | Memory device |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
For the field of electronic countermeasure, signals in 0.1GHz to 2GHz frequency bands are dense, radar signals and communication signals are provided, and various special electronic signals such as IFF signals, ADS-B signals, navigation signals, data chain signals and the like for identifying enemies and peoples are provided, so that the electronic reconnaissance of the frequency bands is extremely high in intelligence value. However, the electromagnetic environment of the frequency band is complex, various signals are seriously interwoven, the reconnaissance, interception and independent operation of each signal in the existing electronic reconnaissance equipment are realized, the single equipment has low frequency spectrum utilization rate, the difficulty of completing system-level fusion is high, the volume power consumption is high, the energy consumption ratio is extremely high, the miniaturization requirement of unmanned operation in the future cannot be met more and more, and the frequency band can not be popularized and used in a large number of military-to-civilian projects.
The invention provides a digital signal processing method which is applied to electronic reconnaissance equipment.
Referring to fig. 1 to 5, in an embodiment of the present invention, the digital signal processing method includes:
step S100, dividing a current channel into a plurality of sub-channel units with preset bandwidths;
step S200, receiving a first digital signal, and acquiring the frequency, bandwidth and quantity of the first digital signal;
step S300, determining the number of the corresponding sub-channel units according to the frequency, the bandwidth and the number of the first digital signal, and re-fusing the sub-channel units with the corresponding number to obtain a channel matched with the frequency, the bandwidth and the number of the first digital signal;
step S400, filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to the system chip 21 through a channel obtained by fusion, so that the system chip 21 outputs the second digital signal to the terminal server.
In the embodiment, digital channelization operation is adopted to divide an original channel into a plurality of sub-channel units with preset bandwidths, the preset bandwidth of each sub-channel unit can be 1bps, 2bps or 3bps, and specific bandwidth setting conditions can be set according to specific application scenarios and signal conditions; after the first digital signal is received, further multi-scale processing is carried out on the digital signal through wavelet transformation, and more accurate time domain and frequency domain detail information is obtained; the frequency, the bandwidth and the number of the first digital signals can be detected through various algorithms, and meanwhile, the number of the required sub-channel units is determined according to the frequency, the bandwidth and the number of the first digital signals; for example, an original channel is divided into 500 sub-channel units with a preset bandwidth, 500 sub-channels are sequentially arranged to be 1-500, the preset bandwidth of each sub-channel unit is 1bps, if the number of received first digital signals is 2, the frequency of the first digital signal is 10Hz, the bandwidth is 10bps, since the frequency is 10Hz, the 10 th sub-channel needs to be fused, and since the bandwidth is 10bps, the 10 th-20 th sub-channel units need to be fused, so that a new channel matched with the first digital signal is formed; the frequency of the second first digital signal is 100Hz, the bandwidth is 50bps, because the frequency is 100Hz, the fusion needs to be started from the 100 th sub-channel, and because the bandwidth is 50bps, the fusion needs to be started from 50 sub-channels, so that the fusion needs to be performed on the 100 th-150 th sub-channel units to form a new channel matched with the second first digital signal; at which time the other unfused subchannels are off. The multiple sub-channel units are fused, so that a channel formed by fusing the multiple sub-channel units is most matched with the bandwidth of the first digital signal, the channel is not larger than the bandwidth of the first digital signal, so that the resource of a processing system is not wasted, and the channel is not smaller than the bandwidth of the first digital signal, so that the signal cannot be normally transmitted; by the way of dynamically recombining the channels, the matching degree of the current signal to be detected can be improved, the resource overhead of a processing system can not be additionally increased, and the power consumption of the electronic reconnaissance equipment in the process of processing a large amount of data is effectively reduced. After a channel matched with the frequency of the first digital signal is obtained, the first digital signal can be filtered, because the electronic reconnaissance equipment can receive signals with different frequencies in the frequency ranges of 0.1GHz to 2GHz, other unnecessary signals need to be filtered, and according to the frequency of the first digital signal, the first digital signal can be screened from various signals through various filtering algorithms, such as an amplitude limiting filtering method, a median filtering method, an arithmetic mean filtering method and the like; if a plurality of signals need to be filtered, different digital signals can be correspondingly filtered through a plurality of filtering algorithms, and then each filtered digital signal is arranged and transmitted to the System Chip 21 one by one, the System Chip 21 can be an SOC (System on Chip) Chip, the System Chip 21 uploads each digital signal to be output to a terminal server, the terminal server can be a cloud platform or a computer, and a user can check the specific situation of the first digital signal through the terminal server. By the digital signal processing method, the corresponding channel can be generated according to the bandwidth of the digital signal, and the corresponding filter is generated according to the frequency of the digital signal for filtering, so that the data throughput rate is improved, and the power consumption of the electronic reconnaissance equipment is reduced.
The technical scheme of the invention divides the current channel into a plurality of sub-channel units with preset bandwidth by adopting digital channelization operation, receives a first digital signal and acquires the frequency, the bandwidth and the number of the first digital signal; determining the number of corresponding sub-channel units according to the frequency, the bandwidth and the number of the first digital signal, and re-fusing the sub-channel units with the corresponding number to obtain a channel matched with the frequency, the bandwidth and the number of the first digital signal; then, the first digital signal is filtered to obtain a second digital signal, and the second digital signal is transmitted to the system chip 21 through a channel matched with the bandwidth of the first digital signal, so that the system chip 21 outputs the second digital signal to the terminal server; according to the scheme, the most matched channel can be selected according to the specific bandwidth of the digital signal to perform signal processing, and different types of signals in the first digital signal are respectively filtered and then output, so that the matching degree of the current to-be-detected signal is improved, the resource overhead of a processing system cannot be additionally increased, and the power consumption of the electronic reconnaissance equipment during processing of a large amount of data is effectively reduced. The invention solves the problem of low frequency spectrum utilization efficiency of the electronic reconnaissance equipment.
Referring to fig. 1 to 5, in an embodiment, the frequency, the bandwidth, and the number of the acquired first digital signals are specifically:
step S210, acquiring the number of detection marks of the first digital signal;
step S220, determining the number of the first digital signals according to the number of the detection marks of the first digital signals;
step S230, amplifying the first digital signal by a preset threshold to obtain an amplified first digital signal;
step S240, comparing the amplified first digital signal with a plurality of preset thresholds;
step S250, when the amplified first digital signal is determined to be a real signal according to the comparison result, tracking the variation trend and the duration of the first digital signal;
step S260, calculating an instantaneous frequency and a bandwidth of the first digital signal according to the variation trend and the duration of the first digital signal.
In this embodiment, the number of the first digital signals may be obtained by obtaining the number of the detection marks of the first digital signals, for example, the number of the first digital signals corresponding to each detection mark is 1 or 2, and the corresponding relationship between the number of the first digital signals and the number of the detection marks may be set according to actual situations; after the number of the first digital signals is determined according to the number of detection marks in the first digital signals, the first digital signals are amplified by a preset threshold and then are compared with a plurality of preset thresholds, and whether the first digital signals are real signals is judged; for example, after the first digital signal is amplified by a threshold, detecting whether the first digital signal can pass through various thresholds, and if the first digital signal can pass through various thresholds, the first digital signal is a real signal; or the first digital signal can pass through several specific thresholds after being amplified by the thresholds, so that the first digital signal is a real signal, the real signal is a signal really required by a user, and the interference of other similar signals, such as signals with close frequency or amplitude, can be eliminated. After the first digital signal is judged to be a signal, frequency tracking is carried out on the first digital signal, the variation trend and the duration of the first digital signal are detected in real time, the instantaneous frequency and the bandwidth of the first digital signal detected in the preset time are calculated and obtained according to the frequency tracking result, the preset time can be 1 second or 2 seconds, and the specific preset time can be set according to the actual situation. In this embodiment, the number of the first digital signals can be determined by the number of the detection marks of the first digital signals, a real signal is obtained by threshold comparison, and the instantaneous frequency and bandwidth of the real signal are calculated after the real signal is tracked.
In an embodiment, the determining that the amplified first digital signal is a real signal according to the comparison result includes:
and if the amplified first digital signal can pass through all preset thresholds, determining that the first digital signal is a real signal.
In this embodiment, because the digital signal may include other disordered signals, the real signal needs to be screened out through threshold comparison, the first digital signal is subjected to threshold amplification and then subjected to threshold comparison with multiple thresholds, if the amplified first digital signal can pass through each of the multiple thresholds, it indicates that the first digital signal is the real signal, and if the amplified first digital signal cannot pass through each of the multiple thresholds, it indicates that the first digital signal is not the real signal. In this embodiment, whether the first digital signal is a real signal is determined by whether the first digital signal can pass through all the preset thresholds.
In one embodiment, the plurality of predetermined thresholds include a constant false alarm detection threshold, an adaptive thermal noise threshold, a communication suppression threshold, and a two-tone auto-mute threshold.
In this embodiment, the multiple thresholds for threshold comparison of the first digital signal may be a constant false alarm detection threshold, an adaptive thermal noise threshold, a communication suppression threshold, and a dual-tone automatic suppression threshold, where if the amplified first digital signal can pass through each of the thresholds, it indicates that the first digital signal is a real signal, and if the amplified first digital signal cannot pass through each of the thresholds, it indicates that the first digital signal is not a real signal. In this embodiment, whether the first digital signal is a real signal can be determined by whether the first digital signal can pass through a constant false alarm detection threshold, a self-adaptive thermal noise threshold, a communication suppression threshold, and a dual-tone automatic suppression threshold.
Referring to fig. 1 to 5, in an embodiment, the step of filtering the first digital signal to obtain a second digital signal specifically includes:
step S410, generating a corresponding filter according to the frequency and the bandwidth of the first digital signal;
and step S420, filtering the amplified first digital signal according to the generated filter to obtain the second digital signal.
In this embodiment, according to the instantaneous frequency and bandwidth of the first digital signal obtained in the above embodiments, the corresponding filters generated by a plurality of different algorithms may be used to respectively filter out different types of corresponding signals from the digital signal, and then the second digital signal obtained after filtering is sorted and output to the terminal server. According to the instantaneous frequency and the bandwidth of the first digital signal, the embodiment can generate a corresponding filter to filter the first digital signal and output the second digital signal.
Referring to fig. 1 to 5, in an embodiment, the filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to the system chip 21 through a channel obtained by fusion, so that the system chip 21 outputs the second digital signal to the terminal server further includes:
step 430, calculating the amplitude, arrival time, frequency and phase of the second digital signal;
step 440, calculating a low confidence signal, a noise interference signal and a high probability false alarm signal in the second digital signal according to the amplitude, the arrival time, the frequency and the phase of the second digital signal;
step 450, filtering out a low confidence signal, a noise interference signal and a large probability false alarm signal in the second digital signal;
and 460, outputting the filtered second digital signal to a terminal server.
In this embodiment, for the filtered second digital signal in the above embodiment, multiple algorithms may be used to calculate parameters such as amplitude, arrival time, frequency, and phase of the second digital signal, and according to the amplitude, arrival time, frequency, and phase of the second digital signal, a low confidence signal, a noise interference signal, and a high probability false alarm signal in the second digital signal are calculated, and then the low confidence, the noise interference, and the high probability false alarm signal in the second digital signal are filtered; because the identification and demodulation of the signal are influenced by the signal-to-noise ratio and have a certain bit error rate or error rate, a confidence evaluation is synchronously given in the signal processing process, and the credibility degree of the processing result is judged to guide the subsequent data processing; if the confidence coefficient is low, the processing result is proved to be unreliable, and the result needs to be filtered; the noise interference signal, i.e. the signal with larger noise, is easy to influence the identification of the real signal required in the digital signal; the false alarm probability refers to the probability that a target is judged to be present when no target actually exists due to the ubiquitous and fluctuating noise in the radar detection process by adopting a threshold detection method; the digital signals after filtering signals such as low confidence, noise interference, large probability false alarm and the like are more accurate. In this embodiment, by calculating the amplitude, arrival time, frequency and phase of the second digital signal, low confidence, noise interference and a high probability false alarm signal in the second digital signal can be filtered out, so that the signal output to the terminal server is more accurate and has higher reliability.
The invention also provides electronic reconnaissance equipment.
Referring to fig. 1 to 5, the electronic reconnaissance apparatus includes:
the front-end frequency conversion component 10 is used for receiving an external radio frequency signal, performing frequency conversion processing on the external radio frequency signal and outputting a first digital signal;
the input end of the acquisition processing component 20 is connected with the output end of the front-end frequency conversion component 10, the acquisition processing component 20 is further in communication connection with a terminal server, a signal processing program is stored in the acquisition processing component 20, and when the signal processing program is executed by the acquisition processing component 20, the digital signal processing method is realized.
In this embodiment, after receiving the external radio frequency signal, the electronic reconnaissance device first performs two-stage amplification in the front-end frequency conversion component 10, so as to obtain a larger signal and ensure that the system has a smaller noise coefficient. When the electronic reconnaissance equipment is in different modes, corresponding frequency hopping local oscillators need to be selected, the frequency hopping local oscillators can be selected by a switch, and when the electronic reconnaissance equipment is in a wide-open interception mode, independent frequency hopping local oscillators are selected; when the direction is in the high-precision direction-finding mode, a common frequency hopping local oscillator is selected, so that six-channel phase synchronization is guaranteed; the shared local oscillator and the independent local oscillator are mutually switched, so that the electronic reconnaissance equipment can be used for wide-open interception and time difference positioning of electronic countermeasure, has a high-precision interception bandwidth of 50MHz multiplied by 6=300MHz instantaneously, can also be used for a high-sensitivity direction-finding system, meets the requirement of 25kHz on the minimum instantaneous interception frequency, and adapts to the requirement of partial communication reconnaissance. In addition, the front-end frequency conversion module 10 further has a frequency self-check signal, and a channel gain self-check signal is embedded in each receiving channel and finally reported to the acquisition processing module 20 through a discrete interface. The acquisition processing component 20 is provided with a control program for signal processing, and when the control program is executed, the above-mentioned digital signal processing method can be implemented, and the signal is output to the terminal server after being subjected to operation and filtering processing. In this embodiment, the front-end frequency conversion module 10 may perform frequency conversion processing on the external radio frequency signal and then output a first digital signal to the acquisition processing module 20, and the acquisition processing module 20 performs operation and filtering processing on the first digital signal and then outputs a second digital signal to the terminal server.
Referring to fig. 1 to 5, in an embodiment, the front-end frequency conversion assembly 10 includes:
a frequency selection component 11, wherein the frequency selection component 11 is configured to select and output the external radio frequency signal with a fixed frequency;
the input end of the low-noise amplifier 12 is connected to the output end of the frequency selection component 11, and the low-noise amplifier 12 is configured to amplify the external radio frequency signal and output the first digital signal to the acquisition and processing component 20.
In this embodiment, the front-end frequency conversion component 10 specifically includes a frequency selection component 11 and a low-noise amplification component 12; the frequency selection component 11 can adopt an industry general customized module, can be developed according to the requirements of frequency coverage, instantaneous interception bandwidth, sensitivity dynamic and the like of a digital signal in practical application, achieves the purpose of in-situ replacement, does not need to replace a hardware circuit of the electronic reconnaissance equipment, and is flexible and convenient. The low noise amplifier component 12 may be comprised of a two-stage amplifier that ensures a higher gain while maintaining a lower noise figure for the system. The front-end frequency conversion assembly 10 may further include a frequency source, which may provide a standard frequency signal for some measurement devices, a filter bank, a control circuit, and a power supply. An oscillator and its accessory circuit capable of generating high accuracy and high stability standard frequency signals (such as 5 MHz, 10 MHz sine signals); the filter bank can amplify the number again, and perform out-of-band filtering after the number is amplified by multiple times; the control circuit can control the frequency conversion of the front-end frequency conversion component 10 to a corresponding frequency band according to a manual instruction, and control the parameter changes such as attenuation gain and the like; the power supply is capable of providing operating power for each device of the front-end frequency conversion assembly 10, so that the front-end frequency conversion assembly 10 can operate normally. In this embodiment, the frequency selection component 11 and the low noise amplifier component 12 form the front end frequency conversion component 10, which can perform frequency conversion processing on the external radio frequency signal and then output a first digital signal to the acquisition processing component 20.
Referring to fig. 1-5, in one embodiment, the acquisition processing assembly 20 includes:
a sampling chip 23, wherein the sampling chip 23 has a sampling end, and the sampling end of the sampling chip 23 is used for acquiring the first digital signal;
a memory 24, the memory 24 storing the signal processing program;
a processor 22, an input of the processor 22 being connected to an output of the sampling chip 23, the processor 22 being further connected to the memory 24, the signal processing program, when executed by the processor 22, implementing the digital signal processing method as described above;
the input end of the system chip 21 is connected to the output end of the processor 22, the system chip 21 is further in communication connection with the terminal server, and the system chip 21 is configured to output the second digital signal to the terminal server.
In this embodiment, the sampling chip 23 may adopt a dual-channel sampling chip 23 with a highest sampling rate of 250MSPS, a resolution of 14bit, and a linear dynamic range greater than 65dBc, the front end of the sampling chip 23 may adopt a dual-balun structure to satisfy high-frequency signal input, a sampling clock of the sampling chip 23 may be input by a low-jitter clock chip, and a phase may be adjusted according to specific conditions. The processor 22 may adopt a Field Programmable Gate Array (FPGA), and the processor 22 completes the time sequence control and the intermediate frequency signal acquisition of the sampling chip 23 and also completes the digital signal processing real-time pipeline operation. The processor 22 can be externally hung with two groups of DDR3 chips, namely a memory 24, each group of memory 24 has 8Gbit capacity, can store the signal processing program, supports the caching of high-speed real-time pipeline data, and can meet the internal data interaction for a GTX high-speed serial bus by 80 pairs. The system chip 21 is mainly responsible for external interface protocol analysis, external data reporting and issuing of the system, and fixed algorithm work such as signal modulation and demodulation, decoding and interpretation, and the like, and improves development efficiency. In this embodiment, the acquisition processing component 20 composed of the sampling chip 23, the processor 22, the memory 24 and the system chip 21 can perform operation and filtering processing on the first digital signal and then output a second digital signal to the terminal server.
The invention also provides an electronic reconnaissance system which comprises the electronic reconnaissance equipment. The specific structure of the electronic reconnaissance device refers to the above embodiments, and since the electronic reconnaissance system adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the specification and drawings or directly/indirectly applied to other related technical fields under the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. A digital signal processing method is applied to electronic reconnaissance equipment and is characterized by comprising the following steps of:
dividing a current channel into a plurality of sub-channel units with preset bandwidths;
receiving a first digital signal, and acquiring the frequency, bandwidth and quantity of the first digital signal;
determining the number of corresponding sub-channel units according to the frequency, the bandwidth and the number of the first digital signal, and re-fusing the sub-channel units with the corresponding number to obtain a channel matched with the frequency, the bandwidth and the number of the first digital signal;
filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to a system chip through a channel obtained by fusion so that the system chip can output the second digital signal to a terminal server;
the acquiring the frequency, the bandwidth and the number of the first digital signal specifically includes:
acquiring the number of detection marks of the first digital signal;
determining the number of the first digital signals according to the number of the detection marks of the first digital signals;
amplifying the first digital signal by a preset threshold to obtain an amplified first digital signal;
comparing the amplified first digital signal with a plurality of preset thresholds;
when the amplified first digital signal is determined to be a real signal according to the comparison result, tracking the variation trend and the duration of the first digital signal;
and calculating the instantaneous frequency and the bandwidth of the first digital signal according to the variation trend and the duration of the first digital signal.
2. The method of claim 1, wherein the determining that the amplified first digital signal is a true signal according to the comparison comprises:
and if the amplified first digital signal can pass through all preset thresholds, determining that the first digital signal is a real signal.
3. The digital signal processing method of claim 1, wherein the plurality of predetermined thresholds include a constant false alarm detection threshold, an adaptive thermal noise threshold, a communication suppression threshold, and a two-tone auto-mute threshold.
4. The method for processing a digital signal according to claim 1, wherein the step of filtering the first digital signal to obtain a second digital signal specifically comprises:
generating a corresponding filter according to the frequency and the bandwidth of the first digital signal;
and filtering the amplified first digital signal according to the generated filter to obtain the second digital signal.
5. The method as claimed in claim 1, wherein the filtering the first digital signal to obtain a second digital signal, and transmitting the second digital signal to the system chip through the channel obtained by fusion, so that the system chip outputs the second digital signal to the terminal server, further comprises:
calculating the amplitude, arrival time, frequency and phase of the second digital signal;
calculating a low confidence signal, a noise interference signal and a high probability false alarm signal in the second digital signal according to the amplitude, the arrival time, the frequency and the phase of the second digital signal;
filtering out low confidence signal, noise interference signal and large probability false alarm signal in the second digital signal;
and outputting the filtered second digital signal to a terminal server.
6. An electronic scout device, characterized in that it comprises:
the front-end frequency conversion assembly is used for receiving an external radio frequency signal, performing frequency conversion processing on the external radio frequency signal and outputting a first digital signal;
the acquisition processing assembly, the input end of the acquisition processing assembly is connected with the output end of the front-end frequency conversion assembly, the acquisition processing assembly is further in communication connection with a terminal server, a signal processing program is stored in the acquisition processing assembly, and when the signal processing program is executed by the acquisition processing assembly, the digital signal processing method according to any one of claims 1 to 5 is realized.
7. The electronic reconnaissance device of claim 6, wherein the front end frequency conversion assembly comprises:
the frequency selection component is used for selecting and outputting the external radio frequency signal with fixed frequency;
the input end of the low-noise amplifier component is connected with the output end of the frequency selection component, and the low-noise amplifier component is used for amplifying the external radio-frequency signal and then outputting the first digital signal to the acquisition processing component.
8. The electronic reconnaissance device of claim 6, wherein the acquisition processing component comprises:
the sampling chip is provided with a sampling end, and the sampling end of the sampling chip is used for collecting the first digital signal;
a memory storing the signal processing program;
a processor, an input of the processor being connected to an output of the sampling chip, the processor being further connected to the memory, the signal processing program, when executed by the processor, implementing the digital signal processing method of any one of claims 1-5;
and the input end of the system chip is connected with the output end of the processor, the system chip is also in communication connection with the terminal server, and the system chip is used for outputting the second digital signal to the terminal server.
9. An electronic reconnaissance system, comprising the electronic reconnaissance apparatus according to any one of claims 6 to 8 and a terminal server.
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