CN-121619206-B - Non-cooperative measurement and control signal parameter identification and analysis method and device and related equipment

CN121619206BCN 121619206 BCN121619206 BCN 121619206BCN-121619206-B

Abstract

The invention provides a method, a device and related equipment for identifying and analyzing parameters of non-cooperative measurement and control signals, wherein the method comprises the steps of carrying out modulation identification and demodulation on the non-cooperative measurement and control signals to obtain a demodulated bit stream, decoding the demodulated bit stream to obtain a decoded bit stream, analyzing the decoded bit stream according to a frame structure of CCSDS (common carrier space data) standards to obtain a plurality of transmission frame identifiers, wherein each transmission frame identifier at least comprises a spacecraft identifier and a virtual channel identifier, and obtaining APID (advanced personal identification) data in the decoded bit stream based on each transmission frame identifier and a packet header structure of the CCSDS standards. By applying the method provided by the invention, the debugging and analysis of the non-cooperative measurement and control signals can be realized automatically, and the operation and maintenance cost is reduced.

Inventors

GONG SHAN
JIANG TIANLI
REN HAO
Cai ze

Assignees

成都墨科科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (8)

1. A non-cooperative measurement and control signal parameter identification and analysis method is characterized by comprising the following steps: Modulating, identifying and demodulating a non-cooperative measurement and control signal to obtain a demodulated bit stream, wherein the non-cooperative measurement and control signal is a signal of a main carrier locked through carrier frequency searching; decoding the demodulated bit stream to obtain a decoded bit stream; Analyzing the decoding bit stream according to a frame structure of CCSDS specification to obtain a plurality of transmission frame identifiers, wherein each transmission frame identifier at least comprises a spacecraft identifier and a virtual channel identifier; Acquiring APID data in the decoding bit stream based on the transmission frame identifiers and the packet header structures of the CCSDS specifications; The method comprises the steps of obtaining a subcarrier in a main carrier, identifying a first modulation mode of the subcarrier, demodulating the subcarrier based on the first modulation mode to obtain a digital signal, carrying out multiple-time spectrum analysis on the digital signal to obtain a center frequency, a symbol rate and a second modulation mode, carrying out DDC resampling, timing synchronization and carrier synchronization operation on the digital signal based on the center frequency and the symbol rate in sequence to obtain a processed digital signal, demodulating the processed digital signal based on the second modulation mode to obtain a demodulated bit stream, and carrying out the demodulation of the digital signal based on the first modulation mode; the decoding method comprises the steps of obtaining a synchronous code set conforming to the CCSDS specification, searching synchronous codes related to a bit sequence and the demodulation bit stream in the synchronous code set, determining the coding type and coding parameters of the demodulation bit stream according to search results, and calling a decoder related to the coding type and the coding parameters to decode the demodulation bit stream to obtain a decoded bit stream.
2. The method according to claim 1, wherein the method further comprises: Searching carrier frequency to obtain main carrier wave meeting the specification of measurement and control signal, locking and tracking the main carrier wave, wherein the locked main carrier wave is non-cooperative measurement and control signal.
3. The method of claim 1, wherein the acquiring the set of synchronization codes compliant with the CCSDS specification comprises: checking whether the demodulated bit stream contains a convolutional code associated with the CCSDS specification; Acquiring a set of synchronization codes which conform to the CCSDS specification and are related to the convolutional codes when the demodulated bit stream contains the convolutional codes; And acquiring all synchronous code sets conforming to the CCSDS specification under the condition that the demodulated bit stream does not contain the convolutional codes.
4. The method of claim 3, wherein said checking whether said demodulated bit stream contains a convolutional code associated with said CCSDS specification comprises: Generating check matrixes of a plurality of code rates corresponding to the convolutional codes; Checking the demodulated bit stream by applying the check matrix of each code rate to obtain the passing rate of each code rate; checking whether the maximum passing rate exceeds a preset check threshold; determining that the demodulated bit stream contains the convolutional code if the maximum pass rate exceeds the check threshold; And determining that the demodulated bit stream does not contain the convolutional code in the case that the maximum pass rate does not exceed the check threshold.
5. The method of claim 4, wherein the obtaining APID data in the decoded bit stream based on the respective transport frame identification and header structure of the CCSDS specification comprises: Determining a packet header position related to a packet header structure in the decoded bit stream according to each transmission frame identifier; based on the packet header position, acquiring each APID information and packet header length in the decoding bit stream; And splicing the APID information based on the length of the packet header to obtain APID data.
6. The non-cooperative measurement and control signal parameter identification and analysis device is characterized by comprising: the demodulation unit is used for carrying out modulation recognition and demodulation on the non-cooperative measurement and control signal to obtain a demodulation bit stream, wherein the non-cooperative measurement and control signal is a signal of a main carrier locked through carrier frequency searching; a decoding unit, configured to decode the demodulated bit stream to obtain a decoded bit stream; The analyzing unit is used for analyzing the decoding bit stream according to a frame structure of the CCSDS specification to obtain a plurality of transmission frame identifiers, wherein each transmission frame identifier at least comprises a spacecraft identifier and a virtual channel identifier; a data processing unit, configured to obtain APID data in the decoded bit stream based on each of the transmission frame identifier and a header structure of the CCSDS specification; The analysis unit carries out modulation recognition and demodulation on the non-cooperative measurement and control signal to obtain a demodulated bit stream, and concretely comprises the steps of obtaining a subcarrier in the main carrier, identifying a first modulation mode of the subcarrier, demodulating the subcarrier based on the first modulation mode to obtain a digital signal, carrying out multiple power spectrum analysis on the digital signal to obtain a center frequency, a symbol rate and a second modulation mode, carrying out DDC resampling, timing synchronization and carrier synchronization operation on the digital signal based on the center frequency and the symbol rate in sequence to obtain a processed digital signal, demodulating the processed digital signal based on the second modulation mode to obtain a demodulated bit stream; The decoding unit decodes the demodulated bit stream to obtain a decoded bit stream, and specifically comprises the steps of obtaining a synchronous code set conforming to the CCSDS specification, searching synchronous codes related to the demodulated bit stream in the synchronous code set, determining the coding type and the coding parameters of the demodulated bit stream according to the searching result, and calling a decoder related to the coding type and the coding parameters to decode the demodulated bit stream to obtain the decoded bit stream.
7. A storage medium comprising stored instructions, wherein the instructions, when executed, control a device in which the storage medium is located to perform the non-cooperative measurement and control signal parameter identification and resolution method of any of claims 1-5.
8. An electronic device comprising a memory and one or more instructions, wherein the one or more instructions are stored in the memory and configured to be executed by one or more processors to perform the non-cooperative measurement and control signal parameter identification and resolution method of any of claims 1-5.

Description

Non-cooperative measurement and control signal parameter identification and analysis method and device and related equipment Technical Field The present invention relates to the field of signal processing technologies, and in particular, to a method and apparatus for identifying and analyzing parameters of non-cooperative measurement and control signals, and related devices. Background With the leap development of aerospace technology, the value of the measurement and control system in the civil and military fields is increasingly remarkable. In this context, the measurement and control signal sensing and protocol analysis technology in a non-cooperative communication scenario has become a key of industry research. The technology can remarkably improve the sensing precision and the resource utilization rate of a frequency spectrum monitoring and cognitive radio system, particularly in the military field, the technology can identify and analyze non-cooperative signals, and has important strategic value. The prior art lacks full-flow automatic processing capability, and needs manual operation of professional technicians from signal detection, parameter debugging and demodulation strategy adjustment to data analysis. On the one hand, the manual intervention has the problems of operation errors, response lag and the like, and cannot adapt to the requirements of scenes such as burst signals, real-time monitoring and the like, and on the other hand, in the scenes such as unattended monitoring stations, large-scale spectrum monitoring networks and the like, the manual operation and maintenance are required to be put into a large amount of labor cost, and the continuous and stable operation for 24 hours is difficult to realize, so that the application scene boundary and the large-scale deployment capability of the prior art are further limited. Disclosure of Invention In view of the above, the invention provides a method, a device and related equipment for identifying and analyzing parameters of non-cooperative measurement and control signals, by which the method can realize automatic debugging and analysis of the non-cooperative measurement and control signals and reduce operation and maintenance cost. A non-cooperative measurement and control signal parameter identification and analysis method comprises the following steps: carrying out modulation recognition and demodulation on the non-cooperative measurement and control signals to obtain a demodulated bit stream; decoding the demodulated bit stream to obtain a decoded bit stream; Analyzing the decoding bit stream according to the frame structure of the CCSDS specification to obtain a plurality of transmission frame identifiers, wherein each transmission frame identifier at least comprises a spacecraft identifier and a virtual channel identifier; And acquiring APID data in the decoding bit stream based on each transmission frame identifier and a packet header structure of the CCSDS specification. The method, optionally, further comprising: Searching carrier frequency to obtain main carrier wave meeting the specification of measurement and control signal, locking and tracking the main carrier wave, wherein the locked main carrier wave is non-cooperative measurement and control signal. The method, optionally, carries out modulation recognition and demodulation on the non-cooperative measurement and control signal to obtain a demodulated bit stream, and includes: obtaining a subcarrier in the main carrier; identifying a first modulation mode of the subcarrier, and demodulating the subcarrier based on the first modulation mode to obtain a digital signal; Carrying out multiple power spectrum analysis on the digital signal to obtain a center frequency, a symbol rate and a second modulation mode; sequentially performing DDC resampling, timing synchronization and carrier synchronization operation on the digital signal based on the center frequency and the symbol rate to obtain a processed digital signal; And demodulating the processed digital signal based on the second modulation mode to obtain a demodulated bit stream. The above method, optionally, decodes the demodulated bit stream to obtain a decoded bit stream, including: acquiring a synchronous code set conforming to the CCSDS specification; searching the synchronous codes related to the demodulation bit stream in the synchronous code set, and determining the coding type and coding parameters of the demodulation bit stream according to the searching result; and decoding the demodulation bit stream according to the coding type and the coding parameters to obtain a decoding bit stream. The method, optionally, the acquiring the set of synchronization codes conforming to the CCSDS specification includes: checking whether the demodulated bit stream contains a convolutional code associated with the CCSDS specification; Acquiring a set of synchronization codes which conform to the CCSDS specification and are related to th