CN114422088A - Rapid satellite signal code identification system and method - Google Patents
Rapid satellite signal code identification system and method Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention discloses a rapid satellite signal coding and identifying system and a rapid satellite signal coding and identifying method, which relate to the technical field of satellite signal analysis and solve the technical problems that the existing hardware platform has poor iteration capability, equipment cannot adapt to the subsequent upgrading requirement of a user after being shaped and the existing software technology has phase ambiguity and positive and negative spectrums; in the software coding identification process, the invention adopts a special code word potential difference analysis method and a mode matching method to solve the phase ambiguity problem caused by demodulation and the positive and negative spectrum problem caused by frequency conversion, thereby improving the identification performance.
Description
Technical Field
The invention relates to the technical field of satellite signal analysis, in particular to a rapid satellite signal code identification system and a rapid satellite signal code identification method.
Background
The performance of the satellite signal identification system determines the accuracy and real-time performance of the satellite signal identification system on monitoring and identification of the satellite signal, a satellite signal coding mode is one of key characteristics of a satellite communication signal, and the rapid analysis and identification of the signal coding mode is beneficial to improving the performance of the signal identification system;
in the existing satellite signal analysis technology, there are two code identification methods: firstly, a hardware platform is adopted to demodulate, code, identify and decode the satellite signals, and secondly, software is adopted to code and identify the signals. The iteration capability is poor by adopting a hardware mode, the equipment cannot adapt to the subsequent upgrading requirement of a user after being shaped, and the problems of phase ambiguity and positive and negative spectrums exist by adopting a software mode, so that the coding identification effect is influenced; and the conventional satellite communication product has a single satellite signal identification mode and cannot meet the diversified use scenes of the satellite signal identification modes in different areas.
Disclosure of Invention
In order to solve the problems existing in the scheme, the invention provides a rapid satellite signal code identification system and a rapid satellite signal code identification method. The invention adopts a software mode to realize the rapid channel coding identification of six modulation signals of BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16QAM, and the identifiable coding modes comprise systematic convolutional codes, non-systematic convolutional codes, Turbo codes, TCM codes and LDPC codes; different types of channel coding modes are identified according to the modulation mode of the signal, so that the software identification speed of the signal coding mode is increased, and the system operation efficiency is fundamentally improved; in the software coding identification process, the invention adopts a special code word potential difference analysis method and a mode matching method to solve the phase ambiguity problem caused by demodulation and the positive and negative spectrum problem caused by frequency conversion, thereby improving the identification performance.
The purpose of the invention can be realized by the following technical scheme:
a rapid satellite signal code identification system comprises a data acquisition module, a server, a storage module, a data analysis module, a display module and a code management module;
the data acquisition module is used for acquiring received satellite data according to preset acquisition parameters and transmitting the acquired satellite data to the server, and the server is used for packaging the received satellite data into data packets and stamping time stamps on the data packets and sending the data packets to the storage module for storage;
the data analysis module is used for reading satellite data stored in the storage module, and carrying out demodulation and decoding analysis according to preset analysis parameters, and the specific analysis steps are as follows:
s1: reading satellite data stored in a storage module;
s2: identifying the modulation mode of the satellite data by combining a big data reference platform according to preset analysis parameters;
s3: determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data;
s4: and performing software coding identification on the satellite data according to the matched identifiable coding mode, specifically:
s41: firstly, identifying Turbo codes and LDPC codes; wherein, in the process of identifying the Turbo code and the LDPC code, a method of analyzing the potential difference of special code words is adopted for identification;
s42: then, identifying a system convolutional code, a non-system convolutional code and a TCM code; in the identification process of the system convolutional code, the non-system convolutional code and the TCM code, a mode matching mode is adopted for identification;
s5: and analyzing the satellite data after the software coding identification in time domain and frequency domain, and transmitting a signal time domain graph and a signal frequency domain graph obtained by analysis to a display module through a server for real-time display.
Further, the memory module comprises a first memory unit and a second memory unit; the first storage unit is used for writing the received satellite data into a memory in a direct memory access mode; the second storage unit is used for rewriting the satellite data into the disk array from the memory.
Further, the code management module is used for storing the modulation mode and the recognizable coding mode of the satellite signal and classifying the modulation mode and the recognizable coding mode; the coding management module comprises a creating unit and an editing unit;
the creating unit is used for configuring a plurality of modulation modes and recognizable coding modes of satellite signals according to the requirements of management personnel, wherein the modulation modes comprise BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16 QAM; the recognizable coding modes comprise a system convolutional code, a non-system convolutional code, a Turbo code, a TCM code and an LDPC code;
the editing unit is used for associating the modulation mode of the satellite signal with the recognizable coding mode and generating a mapping relation table of the modulation mode and the recognizable coding mode;
and the coding management module is used for transmitting the mapping relation table of the modulation mode and the recognizable coding mode to the storage module for storage through the server.
Furthermore, the system also comprises a configuration module, wherein the configuration module is used for configuring the acquisition parameters and the analysis parameters; the preset acquisition parameters comprise a central frequency point and a sampling rate; the preset analysis parameters comprise a modulation mode, a coding mode and a frame format.
Further, in the process of identifying the Turbo code and the LDPC code, a method of analyzing a bit difference of a special codeword is used for identifying, and the specific identification step is as follows:
v1: firstly, searching a synchronous code: because of the uncertainty of the spectrum mode, the uncertainty of the phase ambiguity and the uncertainty of the data starting point, the original synchronous code can generate a plurality of synchronous codes after being transformed;
v2: and searching a synchronous code by traversing data, then carrying out potential difference analysis on the synchronous code with the largest occurrence frequency, and judging the type of the signal when the potential difference is consistent with the frame length of the corresponding satellite signal, thereby determining the spectrum mode, the starting point and the phase ambiguity of the satellite signal.
Further, in the process of identifying the systematic convolutional code, the non-systematic convolutional code and the TCM code, a mode matching method is adopted for identification, which specifically includes:
for non-systematic convolutional codes, deleting bits at certain specific positions of the (2, 1, m) code; after the receiving end receives the sequence, the deleting positions are filled with specific dummy bits, and the VTB decoder prohibits the measurement calculation of the dummy bits, thereby enabling the VTB decoding method of the deleted code to decode.
Further, a fast satellite signal coding identification method comprises the following steps:
the method comprises the following steps: collecting the received satellite data according to preset collection parameters;
step two: storing the collected satellite data, packaging the collected satellite data into a data packet and stamping a time stamp; the method specifically comprises the following steps: firstly, writing acquired satellite data into a memory in a direct memory access mode, and then writing the satellite data into a disk array from the memory;
step three: reading the stored satellite data, and carrying out demodulation and decoding analysis according to preset analysis parameters; the specific analysis steps are as follows:
identifying the modulation mode of the satellite data by combining a big data reference platform according to preset analysis parameters;
determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data;
and performing software coding identification on the satellite data according to the matched identifiable coding mode, specifically:
the method comprises the steps of firstly identifying Turbo codes and LDPC codes, and then identifying systematic convolutional codes, non-systematic convolutional codes and TCM codes.
Further, before determining the identifiable coding mode associated with the modulation mode in the mapping relation table according to the modulation mode of the satellite data, the method further includes:
configuring a plurality of modulation modes and identifiable coding modes of the satellite signals according to the requirements of management personnel, associating the modulation modes and the identifiable coding modes of the satellite signals, and generating a mapping relation table of the modulation modes and the identifiable coding modes.
Compared with the prior art, the invention has the beneficial effects that:
1. the data analysis module is used for reading satellite data stored in the storage module, demodulating, decoding and analyzing the satellite data according to preset analysis parameters, and rapidly identifying channel codes of six modulation signals of BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16QAM in a software mode, wherein the identifiable coding modes comprise a system convolutional code, a non-system convolutional code, a Turbo code, a TCM code and an LDPC code; different types of channel coding modes are identified according to the modulation mode of the signal, so that the software identification speed of the signal coding mode is increased, and the system operation efficiency is fundamentally improved;
2. in the software coding identification process, the invention adopts a special code word potential difference analysis method and a mode matching method to solve the phase ambiguity problem caused by demodulation and the positive and negative spectrum problem caused by frequency conversion, thereby improving the identification performance.
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 drawings without creative efforts.
FIG. 1 is a schematic block diagram of a fast satellite signal code identification system according to the present invention.
Fig. 2 is a schematic diagram of the recognizable coding modes for different modulation modes according to the present invention.
FIG. 3 is a flow chart of the code recognition process of the data analysis module of the present invention.
Fig. 4 is a signal positive and negative spectrum constellation mapping diagram with a modulation mode of 8 PSK.
FIG. 5 is a flow chart of the identification process of TPC7/8 code by using a special code bit difference analysis method.
FIG. 6 is a flow chart of the identification of non-systematic convolutional codes by pattern matching.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
As shown in fig. 1 to 6, a rapid satellite signal code recognition system includes a data acquisition module, a server, a storage module, a data analysis module, a display module, and a code management module;
the data acquisition module is used for acquiring received satellite data according to preset acquisition parameters and transmitting the acquired satellite data to the server, and the server is used for packaging the received satellite data into data packets and stamping time stamps on the data packets and transmitting the data packets to the storage module for storage; the preset acquisition parameters comprise a central frequency point and a sampling rate;
the storage module comprises a first storage unit and a second storage unit, wherein the first storage unit is used for writing the received satellite data into a memory in a direct memory access mode in order to improve the real-time performance of data acquisition; meanwhile, in order to improve the storage capacity of satellite data, the second storage unit is used for rewriting the satellite data into the disk array from the memory;
the data analysis module is used for reading satellite data stored in the storage module and carrying out demodulation and decoding analysis according to preset analysis parameters, wherein the preset analysis parameters comprise a modulation mode, a coding mode and a frame format; the specific analysis steps are as follows:
s1: reading satellite data stored in a storage module;
in this step, satellite data can be read from a memory or a disk array, all data of a certain satellite can be selected according to requirements, and satellite data of a certain time period can be selected for subsequent analysis by collecting a timestamp;
s2: identifying the modulation mode of the satellite data by combining a big data reference platform according to preset analysis parameters;
s3: determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data;
s4: and performing software coding identification on the satellite data according to the matched identifiable coding mode, specifically:
firstly, identifying Turbo codes and LDPC codes, and then identifying systematic convolutional codes or non-systematic convolutional codes or TCM codes;
the coding modes which can be identified by the invention aiming at different modulation modes are shown in figure 2; in order to improve the software identification speed of the signal coding mode, the invention identifies different types of channel coding modes according to the modulation mode of the signal, for example, aiming at the signal of which the modulation mode is QPSK, Turbo code and LDPC code identification are firstly carried out, and then systematic convolutional code and non-systematic convolutional code identification are carried out; for a signal with a modulation mode of 8PSK, Turbo code and LDPC code identification is firstly carried out, and then TCM code identification is carried out. Therefore, the system can finish the identification of the signal channel coding mode at the highest speed, and the system operation efficiency is fundamentally improved;
s5: performing time domain and frequency domain analysis on satellite data identified by the software codes, and transmitting a signal time domain diagram and a signal frequency domain diagram obtained by analysis to a display module through a server for real-time display;
in the process of identifying the coding mode of the signal, the problems of phase ambiguity caused by demodulation and positive and negative spectrums caused by frequency conversion need to be solved. Therefore, in the process of identifying the Turbo code and the LDPC code, the invention mainly adopts a method of analyzing the potential difference of the special code words to solve the problems of phase ambiguity and positive and negative spectrums; in the identification process of the systematic convolutional code, the non-systematic convolutional code and the TCM code, the problems of phase ambiguity and positive and negative spectrums are mainly solved by adopting a mode matching method. The following is specifically analyzed:
1. special code potential difference analysis method
For Turbo codes and LDPC codes, the invention mainly solves the problems of forward spectrum and backward spectrum, the phase ambiguity and the starting point through a special code potential difference analysis method;
a signal positive and negative spectrum constellation map with a modulation mode of 8PSK is shown in fig. 4;
the identification process is analyzed by taking an example of a TPC7/8 code with a modulation mode of 8PSK and a frame length of 16320, and the frame structure of the TPC7/8 code with the frame length of 16320 is shown in the following table:
frame structure of TPC7/8 code
| Synchronization code 32 | 32 | 118*128 | 128 | 8*128 |
The signal frame length is 16320, the synchronous column is 32 bits, the horizontal direction is composed of 32 bits and 119 128 bits, wherein the 32 bits are (31, 24) BCH code and one-bit even check; the 128 bits are (127, 120) BCH codes and one-bit even check, 120 bits of information in 119 th 128 bits are useful information which is only 96 bits, and the other 24 bits are used to be verified;
the identification process of the TPC7/8 code mainly comprises the steps of searching a synchronous code, then carrying out bit difference analysis on the position of the synchronous code, and judging that the signal is the standard TPC7/8 when the bit difference is 16320. The main work of code identification will be focused on the determination of the synchronization code. That is, the positive and negative spectra of the 32-bit sync code through frequency conversion and the phase ambiguity of demodulation will generate different sync codes. Due to the uncertainty of the spectral pattern, the uncertainty of the phase ambiguity, and the uncertainty of the data start, the original synchronization code is transformed to generate 48 synchronization codes. Namely 2 positive and negative spectra, 8 phase ambiguities and 3 starting points. The 8 phase ambiguity synchronization data with the spectrum mode being positive spectrum and the starting point being 0 are respectively shown in the following table:
TPC7/8 phase ambiguity synchronous data table
| Serial number | Synchronization code(original) | Spectral pattern | Starting point | Phase ambiguity | Synchronization code (after conversion) |
| 1 | 0xF8DD4258 | Is just | 0 | 0 degree | 0xF8DD4258 |
| 2 | 0xF8DD4258 | Is just | 0 | 45 degree | 0xC875E368 |
| 3 | 0xF8DD4258 | Is just | 0 | 90 degree | 0x4E67A92C |
| 4 | 0xF8DD4258 | Is just | 0 | 135 degree | 0x66A2B804 |
| 5 | 0xF8DD4258 | Is just | 0 | 180 degrees | 0x23B0F480 |
| 6 | 0xF8DD4258 | Is just | 0 | 225 degree | 0x131855B0 |
| 7 | 0xF8DD4258 | Is just | 0 | 270 degree | 0x950A1FF4 |
| 8 | 0xF8DD4258 | Is just | 0 | 315 degree | 0xBDCF0EDC |
Searching for a synchronous code by traversing data, then carrying out potential difference analysis on the synchronous code with the largest occurrence frequency, and judging that the signal is a standard TPC7/8 signal when the potential difference is 16320; the spectral pattern, the starting point and the phase ambiguity of the signal are determined; the processing procedure is shown in FIG. 5;
2. pattern matching method
For systematic convolutional codes, non-systematic convolutional codes and TCM codes, the invention mainly solves the problems of forward and backward spectrums, phase ambiguity and starting points in a mode of mode matching;
for non-systematic convolutional codes, in order to increase the code rate and not increase the complexity of the encoder, the (2, 1, m) code is usually deleted, i.e., bits at certain specific positions of the (2, 1, m) code are deleted. After the receiving end receives the sequence, the deleting position is filled with specific dummy bits. The VTB decoder disables metric calculations for these dummy bits, thereby enabling decoding by the erasure decoding VTB decoding method. For QPSK modulated signals, the syndrome of coding VIT3/4 is as follows:
H（1,1）=1111011
H（1,2）=1101101
H（1,3）=1010110
H（1,4）=1100010
the identification process is shown in FIG. 6;
the code management module is used for storing the modulation mode and the recognizable code mode of the satellite signal and classifying the modulation mode and the recognizable code mode; the coding management module comprises a creating unit and an editing unit;
the system comprises a creating unit, a transmitting unit and a receiving unit, wherein the creating unit is used for configuring a modulation mode and an identifiable coding mode of a plurality of satellite signals according to the requirements of managers, the modulation mode comprises common modulation modes of six satellite signals such as BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16QAM, and the identifiable coding mode comprises a system convolutional code, a non-system convolutional code, a Turbo code, a TCM code and an LDPC code;
the editing unit is used for associating the modulation mode of the satellite signal with the recognizable coding mode and generating a mapping relation table of the modulation mode and the recognizable coding mode;
the coding management module is used for transmitting the mapping relation table of the modulation mode and the recognizable coding mode to the storage module for storage through the server;
the system also comprises a configuration module, a data acquisition module and a data analysis module, wherein the configuration module is used for configuring the acquisition parameters and the analysis parameters;
a rapid satellite signal code identification method comprises the following steps:
the method comprises the following steps: collecting the received satellite data according to preset collection parameters;
in addition, before the step one, the method may further include:
presetting acquisition parameters, wherein the acquisition parameters at least comprise a central frequency point, a sampling rate and the like; of course, the acquisition parameters may include other content;
step two: storing the collected satellite data, packaging the collected satellite data into a data packet and stamping a time stamp; writing the original satellite data acquired in the step one into a disk array in real time, and labeling the acquired satellite data time after the satellite data;
specifically, in order to improve the real-time performance of data acquisition, the acquired satellite data can be written into the memory in a direct memory access mode, and meanwhile, in order to improve the storage capacity of the satellite data, the satellite data can be written into the disk array from the memory;
step three: reading the stored satellite data, and carrying out demodulation and decoding analysis according to preset analysis parameters; in this step, satellite data can be read from a memory or a disk array, all data of a certain satellite can be selected according to requirements, and satellite data of a certain time period can be selected for subsequent analysis by collecting a timestamp; the specific analysis steps are as follows:
s31: reading the stored satellite data;
s32: identifying the modulation mode of the satellite data by combining a big data reference platform according to preset analysis parameters;
s33: determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data;
s34: and performing software coding identification on the satellite data according to the matched identifiable coding mode, specifically:
firstly, identifying Turbo codes and LDPC codes, and then identifying systematic convolutional codes or non-systematic convolutional codes or TCM codes;
further, before step S33, the method may further include:
configuring a modulation mode and an identifiable coding mode of a plurality of satellite signals according to the requirements of management personnel;
associating the modulation mode of the satellite signal with the recognizable coding mode to generate a mapping relation table of the modulation mode and the recognizable coding mode;
the invention adopts a software mode to realize the rapid channel coding identification of six modulation signals of BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16QAM, and the identifiable coding modes comprise systematic convolutional codes, non-systematic convolutional codes, Turbo codes, TCM codes and LDPC codes; different types of channel coding modes are identified according to the modulation mode of the signal, so that the software identification speed of the signal coding mode is increased, and the system operation efficiency is fundamentally improved;
meanwhile, before the third step, the method may further include:
configuring analysis parameters in advance, wherein the analysis parameters at least comprise a modulation mode, a coding mode, a frame format and the like;
in the process of identifying the Turbo code and the LDPC code, a method of analyzing the potential difference of special code words is adopted for identification, and the specific identification steps are as follows:
v1: firstly, searching a synchronous code: because of the uncertainty of the spectrum mode, the uncertainty of the phase ambiguity and the uncertainty of the data starting point, the original synchronous code can generate a plurality of synchronous codes after being transformed;
v2: searching a synchronous code through traversal data, then carrying out potential difference analysis on the synchronous code with the largest occurrence frequency, judging the type of the signal when the potential difference is consistent with the frame length of the corresponding satellite signal, and determining the spectrum mode, the starting point and the phase ambiguity of the satellite signal;
in the identification process of the systematic convolutional code, the non-systematic convolutional code and the TCM code, a mode matching mode is adopted for identification, wherein for the non-systematic convolutional code, bits on certain specific positions of the (2, 1, m) code are deleted; after the receiving end receives the sequence, the deleting positions are filled with specific dummy bits, and the VTB decoder prohibits the measurement calculation of the dummy bits, thereby enabling the VTB decoding method of the deleted code to decode.
In the software coding identification process, the invention adopts a special code word potential difference analysis method and a mode matching method to solve the phase ambiguity problem caused by demodulation and the positive and negative spectrum problem caused by frequency conversion, thereby improving the identification performance.
The working principle of the invention is as follows:
a rapid satellite signal code identification system and method, in operation, collect the satellite data received according to the preset acquisition parameter at first; storing the collected satellite data, packaging the collected satellite data into a data packet and stamping a time stamp; reading the stored satellite data, demodulating, decoding and analyzing the satellite data according to preset analysis parameters, and identifying the modulation mode of the satellite data by combining a big data reference platform according to the preset analysis parameters; determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data; performing software coding identification on the satellite data according to a matched identifiable coding mode, firstly performing Turbo code and LDPC code identification, and then performing systematic convolutional code or non-systematic convolutional code or TCM code identification;
in the process of identifying the Turbo code and the LDPC code, a special code word potential difference analysis method is adopted for identification, synchronous codes are searched firstly, the synchronous codes are searched through traversal data, then the potential difference analysis is carried out on the synchronous codes with the largest occurrence frequency, when the potential difference is consistent with the frame length of a corresponding satellite signal, the type of the signal can be judged, and at the moment, the spectrum mode, the starting point and the phase ambiguity of the satellite signal are also determined; in the identification process of the systematic convolutional code, the non-systematic convolutional code and the TCM code, identifying by adopting a mode matching mode, wherein for the non-systematic convolutional code, bits on certain specific positions of the (2, 1, m) code are deleted; after the receiving end receives the sequence, filling specific false bits at the deletion position, and prohibiting the VTB decoder from performing measurement calculation on the false bits, so that the VTB decoding method of the deleted code is used for decoding; in the software coding identification process, the invention adopts a special code word potential difference analysis method and a mode matching method to solve the phase ambiguity problem caused by demodulation and the positive and negative spectrum problem caused by frequency conversion, thereby improving the identification performance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A rapid satellite signal coding and identifying system is characterized by comprising a data acquisition module, a server, a storage module, a data analysis module, a display module and a coding management module;
the data acquisition module is used for acquiring received satellite data according to preset acquisition parameters and transmitting the acquired satellite data to the server, and the server is used for packaging the received satellite data into data packets and stamping time stamps on the data packets and sending the data packets to the storage module for storage;
the data analysis module is used for reading satellite data stored in the storage module, and carrying out demodulation and decoding analysis according to preset analysis parameters, and the specific analysis steps are as follows:
s1: reading satellite data stored in a storage module;
s2: identifying the modulation mode of the satellite data by combining a big data reference platform according to preset analysis parameters;
s3: determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data;
s4: and performing software coding identification on the satellite data according to the matched identifiable coding mode, specifically:
s41: firstly, identifying Turbo codes and LDPC codes; wherein, in the process of identifying the Turbo code and the LDPC code, a method of analyzing the potential difference of special code words is adopted for identification;
s42: then, identifying a system convolutional code, a non-system convolutional code and a TCM code; in the identification process of the system convolutional code, the non-system convolutional code and the TCM code, a mode matching mode is adopted for identification;
s5: and analyzing the satellite data after the software coding identification in time domain and frequency domain, and transmitting a signal time domain graph and a signal frequency domain graph obtained by analysis to a display module through a server for real-time display.
2. The rapid satellite signal code identification system of claim 1, wherein said memory module comprises a first memory unit and a second memory unit; the first storage unit is used for writing the received satellite data into a memory in a direct memory access mode; the second storage unit is used for rewriting the satellite data into the disk array from the memory.
3. The system according to claim 1, wherein the code management module is configured to store and classify the modulation scheme and the recognizable coding scheme of the satellite signal; the coding management module comprises a creating unit and an editing unit;
the creating unit is used for configuring a plurality of modulation modes and recognizable coding modes of satellite signals according to the requirements of management personnel, wherein the modulation modes comprise BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16 QAM; the recognizable coding modes comprise a system convolutional code, a non-system convolutional code, a Turbo code, a TCM code and an LDPC code;
the editing unit is used for associating the modulation mode of the satellite signal with the recognizable coding mode and generating a mapping relation table of the modulation mode and the recognizable coding mode;
and the coding management module is used for transmitting the mapping relation table of the modulation mode and the recognizable coding mode to the storage module for storage through the server.
4. The system according to claim 1, further comprising a configuration module for configuring the acquisition parameters and the analysis parameters; the preset acquisition parameters comprise a central frequency point and a sampling rate; the preset analysis parameters comprise a modulation mode, a coding mode and a frame format.
5. The rapid satellite signal coding identification system according to claim 1, wherein in the process of identifying the Turbo code and the LDPC code, a method of analyzing a bit difference of a special codeword is used for identification, and the specific identification steps are as follows:
v1: firstly, searching a synchronous code: because of the uncertainty of the spectrum mode, the uncertainty of the phase ambiguity and the uncertainty of the data starting point, the original synchronous code can generate a plurality of synchronous codes after being transformed;
v2: and searching a synchronous code by traversing data, then carrying out potential difference analysis on the synchronous code with the largest occurrence frequency, and judging the type of the signal when the potential difference is consistent with the frame length of the corresponding satellite signal, thereby determining the spectrum mode, the starting point and the phase ambiguity of the satellite signal.
6. The system according to claim 1, wherein in the process of identifying systematic convolutional codes, non-systematic convolutional codes and TCM codes, pattern matching is adopted for identification, and the method specifically comprises:
for non-systematic convolutional codes, deleting bits at certain specific positions of the (2, 1, m) code; after the receiving end receives the sequence, the deleting positions are filled with specific dummy bits, and the VTB decoder prohibits the measurement calculation of the dummy bits, thereby enabling the VTB decoding method of the deleted code to decode.
7. A rapid satellite signal code identification method is characterized by comprising the following steps:
the method comprises the following steps: collecting the received satellite data according to preset collection parameters;
step two: storing the collected satellite data, packaging the collected satellite data into a data packet and stamping a time stamp; the method specifically comprises the following steps: firstly, writing acquired satellite data into a memory in a direct memory access mode, and then writing the satellite data into a disk array from the memory;
step three: reading the stored satellite data, and carrying out demodulation and decoding analysis according to preset analysis parameters; the specific analysis steps are as follows:
identifying the modulation mode of the satellite data by combining a big data reference platform according to preset analysis parameters;
determining an identifiable coding mode associated with the modulation mode in a corresponding mapping relation table according to the modulation mode of the satellite data;
and performing software coding identification on the satellite data according to the matched identifiable coding mode, specifically:
the method comprises the steps of firstly identifying Turbo codes and LDPC codes, and then identifying systematic convolutional codes, non-systematic convolutional codes and TCM codes.
8. The method as claimed in claim 7, wherein before determining the identifiable coding scheme associated with the modulation scheme in the mapping table according to the modulation scheme of the satellite data, the method further comprises:
configuring a plurality of modulation modes and identifiable coding modes of the satellite signals according to the requirements of management personnel, associating the modulation modes and the identifiable coding modes of the satellite signals, and generating a mapping relation table of the modulation modes and the identifiable coding modes.
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