CN111800183A - A satellite communication method, device and system for high-speed data transmission service - Google Patents

Abstract

The application relates to a satellite communication method, a device and a system for high-speed data transmission service. The method comprises the following steps: receiving a communication signal which is sent by user equipment and contains a code division multiple access signal and a frequency division multiple access signal; analyzing the code division multiple access signal to obtain an initial code phase and a carrier frequency contained in the code division multiple access signal, and tracking the code division multiple access signal according to the initial code phase and the carrier frequency to obtain time-frequency synchronization information; and resolving the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service information. The method can realize high-speed data transmission satellite communication.

Description

A satellite communication method, device and system for high-speed data transmission service

technical field

The present application relates to the technical field of satellite communication, and in particular, to a satellite communication method, device and system for high-speed data transmission services.

Background technique

The satellite communication system is mainly composed of a space segment, a ground control center and a user segment. The space segment consists of a satellite constellation containing several satellites. The signal and the inbound signal sent by the user machine have certain anti-interference ability. The ground control center completes user signal transmission and reception measurement and information transmission and reception processing, and manages and controls the operation of the entire system. The user segment receives data services and control messages from the ground control center, and sends inbound messages according to its own business requirements and outbound control signaling to implement functions such as positioning, timing, and short message communication.

The current user inbound system of the RDSS service system adopts the CDMA transmission system, and the basic services of the service are short message communication and location reporting services. With the diversification of user needs, it is necessary to further expand the service business, especially the high-speed data transmission service that can temporarily access emergency big data, and can flexibly provide services such as pictures, voice, and small videos. Only by adopting a new service system can the RDSS system gain a place in the case of the further rapid expansion of the ground mobile communication network and the rapid development of satellite communication services.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a satellite communication method, device and system for high-speed data transmission service that can realize the high-speed data transmission of satellite communication in order to solve the above technical problems.

A satellite communication method oriented to high-speed data transmission service, the method comprises:

receiving a communication signal including a CDMA signal and a frequency division multiple access signal sent by the user equipment;

Parse the CDMA signal to obtain the initial code phase and carrier frequency contained in the CDMA signal, and track the CDMA signal according to the initial code phase and the carrier frequency, and obtain when, frequency synchronization information;

The frequency division multiple access signal is analyzed according to the time and frequency synchronization information to obtain communication service information.

In one of the embodiments, the method further includes: receiving a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment; wherein the code division multiple access signal occupies all frequency bands, and the frequency division multiple access signal The signal occupies the sub-band corresponding to the user equipment.

In one of the embodiments, the method further includes: tracking the code division multiple access signal according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information and the frequency division multiple access signal corresponding to the sub-band Instructions.

In one of the embodiments, the method further includes: calculating the length of the CDMA signal using the Gold code according to the usable duration and system bandwidth properties of the CDMA signal.

In one of the embodiments, the method further includes: analyzing the frequency division multiple access signal according to the time and frequency synchronization information and the indication information to obtain communication service data.

In one of the embodiments, the method further includes: using LDPC coding of 16QAM and a code rate of 3/4 as a modulation and coding manner of the baseband signal to analyze the frequency division multiple access signal.

A satellite communication device oriented to high-speed data transmission service, the device comprises:

a receiving module, configured to receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment;

A synchronization parsing module is used to analyze the CDMA signal to obtain the initial code phase and carrier frequency contained in the CDMA signal, and analyze the CDMA signal according to the initial code phase and the carrier frequency. Track and get time and frequency synchronization information;

The service information analysis module is configured to analyze the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service data.

In one of the embodiments, the receiving module is further configured to receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment; wherein the code division multiple access signal occupies all frequency bands, and the The frequency division multiple access signal occupies the sub-band corresponding to the user equipment.

In one embodiment, the synchronization analysis module is further configured to track the code division multiple access signal according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information and the frequency division multiple access The indication information of the corresponding sub-band of the signal.

A satellite communication system for high-speed data transmission services, comprising:

User equipment, for sending communication signals including CDMA signals and frequency division multiple access signals to the ground control center;

The ground control center is used to receive the communication signal of the communication signal; analyze the code division multiple access signal to obtain the initial code phase and carrier frequency contained in the code division multiple access signal, according to the initial code phase and the The carrier frequency tracks the code division multiple access signal to obtain time and frequency synchronization information; analyzes the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service information.

The above-mentioned satellite communication method, device and system for high-speed data transmission service, by changing the structure of the communication signal, that is, part of it is used for carrier pseudo-code synchronization, and the other part is used to complete the communication function, when applying high-speed modulation and coding, it can be Realize high-speed data transmission.

Description of drawings

Fig. 1 is the application scene diagram of the satellite communication method oriented to high-speed data transmission service in one embodiment;

2 is a schematic flowchart of a satellite communication method for high-speed data transmission services in one embodiment;

3 is a schematic structural diagram of a communication signal in an embodiment;

4 is a schematic diagram of a frequency band occupied by a communication signal in an embodiment;

5 is a receiving satellite constellation diagram in one embodiment;

Fig. 6 is the structural block diagram of the satellite communication device oriented to high-speed data transmission service in one embodiment;

FIG. 7 is a structural block diagram of a satellite communication system oriented to a high-speed data transmission service in an embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

The satellite communication method for high-speed data transmission service provided by the present application can be applied to the application environment shown in FIG. 1 . The satellite communication system is mainly composed of a space segment, a ground control center and a user segment. The space segment consists of a satellite constellation containing several satellites. The signal and the inbound signal sent by the user machine have certain anti-interference ability. The ground control center completes user signal transmission and reception measurement and information transmission and reception processing, and manages and controls the operation of the entire system. The user segment receives data services and control messages from the ground control center, and sends inbound messages according to its own business requirements and outbound control signaling to implement functions such as positioning, timing, and short message communication.

In one embodiment, as shown in FIG. 2, a satellite communication method for high-speed data transmission service is provided, and the method is applied to the ground control center in FIG. 1 as an example to illustrate, including the following steps:

Step 202: Receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment.

The communication signal can be generated by inter-frame fusion of the CDMA signal and the frequency division multiple access signal. As shown in Figure 3, the communication signal includes: the CDMA pilot signal and the frequency division multiple access high-speed data transmission communication symbol, The code division multiple access pilot signal is used to realize the carrier pseudo code synchronization, and the frequency division multiple access high-speed data transmission communication symbol is used to realize the communication function.

Step 204: Analyze the CDMA signal to obtain the initial code phase and carrier frequency contained in the CDMA signal, and track the CDMA signal according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information .

Step 206: Analyze the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service information.

In the above-mentioned satellite communication method for high-speed data transmission service, by changing the structure of communication data, that is, part of it is used for carrier pseudo-code synchronization, and the other part is used to complete the communication function, high-speed data transmission can be realized when high-speed modulation and coding is applied.

In one of the embodiments, as shown in FIG. 4 , a communication signal including a CDMA signal and a frequency division multiple access signal sent by the user equipment is received; wherein, the CDMA signal occupies all frequency bands, and the frequency division multiple access signal Occupies the sub-band corresponding to the user equipment. In this embodiment, the sub-bands can be allocated according to users, that is, the sub-bands of the frequency division multiple access signals of different users are allocated according to requirements, and the code division multiple access signals occupy all frequency bands to improve the anti-interference ability and synchronization performance.

In one of the embodiments, the code division multiple access signal is tracked according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information and indication information of the sub-band corresponding to the frequency division multiple access signal. In this embodiment, the indication information is used to indicate the frequency band where the frequency division multiple access signal is located.

In one of the embodiments, the length of the CDMA signal using the Gold code is calculated according to the usable duration and system bandwidth properties of the CDMA signal.

In this embodiment, the initial code phase and carrier frequency of the CDMA signal are determined. According to the initial code phase and carrier frequency of the CDMA signal, the CDMA signal is tracked to obtain the time and frequency synchronization information of the frequency division multiple access signal, and the indication information of the sub-spectrum where the frequency division multiple access signal is demodulated is used to assist Demodulation of frequency division multiple access signals. The code division multiple access pilot signal can be selected from the Gold code with good autocorrelation and cross-correlation characteristics, and the code length can be designed according to the beacon's available time length and system bandwidth.

In one of the embodiments, when the frequency division multiple access signal is analyzed, the frequency division multiple access signal is analyzed according to the time and frequency synchronization information and the indication information to obtain the communication service data.

In one of the embodiments, the frequency division multiple access signal is analyzed by adopting LDPC coding of 16QAM and a code rate of 3/4 as the modulation and coding mode of the baseband signal. The supported information rate is 384Kbps.

Specifically, when the above method is used for satellite communication, the user equipment adopts a 50W power amplifier and the antenna gain is 10dBi, and a new communication system is adopted. The sub-band bandwidth is 1.02MHz, the user's information transmission rate is 384kbps, and the coding gain is 6dB. As can be seen from Figure 5, the constellation diagram can be distinguished, the receiving performance is good, and the communication quality requirements of high-speed data transmission services are met.

It should be understood that although the various steps in the flowchart of FIG. 2 are shown in sequence according to the arrows, these steps are not necessarily executed in the sequence shown by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order, and these steps may be performed in other orders. Moreover, at least a part of the steps in FIG. 2 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed and completed at the same time, but may be executed at different times. The execution of these sub-steps or stages The sequence is also not necessarily sequential, but may be performed alternately or alternately with other steps or sub-steps of other steps or at least a portion of a phase.

In one embodiment, as shown in FIG. 6, a satellite communication device oriented to high-speed data transmission service is provided, including: a receiving module 602, a synchronization analysis module 604, and a business information analysis module 606, wherein:

a receiving module 602, configured to receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment;

A synchronization parsing module 604 is configured to parse the CDMA signal to obtain the initial code phase and carrier frequency contained in the CDMA signal, and analyze the CDMA signal according to the initial code phase and the carrier frequency. The signal is tracked to obtain time and frequency synchronization information;

The service information analysis module 606 is configured to analyze the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service data.

In one embodiment, the receiving module 602 is further configured to receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment; wherein the code division multiple access signal occupies all frequency bands, and the frequency division multiple access signal occupies all frequency bands. The division multiple access signal occupies the sub-band corresponding to the user equipment.

In one embodiment, the synchronization analysis module 604 is further configured to track the code division multiple access signal according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information and the frequency division multiple access signal Indication information of the corresponding sub-band.

In one of the embodiments, it further includes: an information setting module, configured to calculate the length of the CDMA signal using the Gold code according to the usable duration and system bandwidth properties of the CDMA signal.

In one embodiment, the service information analysis module 606 is further configured to analyze the frequency division multiple access signal according to the time and frequency synchronization information and the indication information to obtain communication service data.

In one embodiment, the service information parsing module 606 is further configured to parse the frequency division multiple access signal by using LDPC coding of 16QAM and a code rate of 3/4 as the modulation and coding manner of the baseband signal.

For the specific limitation of the satellite communication device oriented to the high-speed data transmission service, reference may be made to the above definition of the satellite communication method oriented to the high-speed data transmission service, which will not be repeated here. Each module in the above-mentioned high-speed data transmission service-oriented satellite communication device may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

In one of the embodiments, as shown in FIG. 7, a satellite communication system for high-speed data transmission service is provided, including:

User equipment, configured to send a communication signal including a code division multiple access signal and a frequency division multiple access signal to a base station receiving apparatus;

In one of the embodiments, as shown in FIG. 7, a satellite communication system for high-speed data transmission service is also provided, including:

User equipment, configured to send a communication signal including a code division multiple access signal and a frequency division multiple access signal to a base station receiving apparatus;

The ground control center is used to receive the communication signal of the communication signal; analyze the code division multiple access signal to obtain the initial code phase and carrier frequency contained in the code division multiple access signal, according to the initial code phase and the carrier frequency The frequency tracks the code division multiple access signal to obtain time and frequency synchronization information; analyzes the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service information.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database or other medium used in the various embodiments provided in this application may include non-volatile and/or volatile memory. Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Road (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM) and so on.

The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (10)

1. a satellite communication method for high-speed data transmission service, the method comprises: receiving a communication signal including a CDMA signal and a frequency division multiple access signal sent by the user equipment; Parse the CDMA signal to obtain the initial code phase and carrier frequency contained in the CDMA signal, and track the CDMA signal according to the initial code phase and the carrier frequency, and obtain when, frequency synchronization information; The frequency division multiple access signal is analyzed according to the time and frequency synchronization information to obtain communication service information. 2. The method according to claim 1, wherein the receiving a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment comprises: A communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment is received; wherein the code division multiple access signal occupies all frequency bands, and the frequency division multiple access signal occupies a sub-frequency band corresponding to the user equipment. 3. The method according to claim 1, wherein the code division multiple access signal is tracked according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information, comprising: The code division multiple access signal is tracked according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information and indication information of the sub-band corresponding to the frequency division multiple access signal. 4. The method according to claim 3, wherein the method further comprises: According to the usable duration and system bandwidth properties of the CDMA signal, the length of the CDMA signal using the Gold code is calculated. 5. The method according to claim 3, wherein analyzing the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service data, comprising: The frequency division multiple access signal is analyzed according to the time and frequency synchronization information and the indication information to obtain communication service data. 6. The method according to any one of claims 1 to 5, wherein the method further comprises: The frequency division multiple access signal is analyzed by adopting 16QAM and LDPC coding with a code rate of 3/4 as the modulation and coding mode of the baseband signal. 7. A satellite communication device for high-speed data transmission service, wherein the device comprises: a receiving module, configured to receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment; A synchronization parsing module is used to analyze the CDMA signal to obtain the initial code phase and carrier frequency contained in the CDMA signal, and analyze the CDMA signal according to the initial code phase and the carrier frequency. Track and get time and frequency synchronization information; The service information analysis module is configured to analyze the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service data. 8 . The apparatus according to claim 7 , wherein the receiving module is further configured to receive a communication signal including a code division multiple access signal and a frequency division multiple access signal sent by the user equipment; wherein the code division multiple access signal The address signal occupies all frequency bands, and the frequency division multiple access signal occupies the sub-band corresponding to the user equipment. 9. The apparatus according to claim 7, wherein the synchronization analysis module is further configured to track the code division multiple access signal according to the initial code phase and the carrier frequency to obtain time and frequency synchronization information and indication information of the sub-band corresponding to the frequency division multiple access signal. 10. A satellite communication system for high-speed data transmission service, characterized in that, comprising: User equipment, for sending communication signals including CDMA signals and frequency division multiple access signals to the ground control center; The ground control center is used to receive the communication signal of the communication signal; analyze the code division multiple access signal to obtain the initial code phase and carrier frequency contained in the code division multiple access signal, according to the initial code phase and the The carrier frequency tracks the code division multiple access signal to obtain time and frequency synchronization information; analyzes the frequency division multiple access signal according to the time and frequency synchronization information to obtain communication service information.

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