CN111711476B - Real-time frame synchronization system and method based on satellite communication countermeasure system - Google Patents
Real-time frame synchronization system and method based on satellite communication countermeasure system Download PDFInfo
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- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- H—ELECTRICITY
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
The invention belongs to the technical field of satellite communication, and particularly relates to a real-time frame synchronization system and a real-time frame synchronization method based on a satellite communication countermeasure system. The system comprises: the system comprises: the device comprises a signal processing device, a processor and an upper computer; the signal processor device is in signal connection with the processor; the processor is respectively in signal connection with the signal processing device and the upper computer; the upper computer provides the parameters for the operator to send the parameters for receiving the master station signals to the processor; and the processor is used for sending the parameters of the master station signals to the signal processing device, extracting the frame plan table and sending the frame plan table to the signal processing device. The method can realize real-time change of the frame plan under the condition of ensuring that the superframe period is not changed; meanwhile, the invention also has the advantages of wide applicability and resource saving.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and particularly relates to a real-time frame synchronization system and a real-time frame synchronization method based on a satellite communication countermeasure system.
Background
Satellite communication is simply communication between radio communication stations on earth (including the ground and in the lower atmosphere) using a satellite as a relay. The satellite communication system consists of two parts, a satellite and an earth station. The satellite communication is characterized in that: the communication range is large; communication can be performed from any two points as long as the range covered by the electric wave transmitted by the satellite is covered; the device is not easily affected by land disasters (high reliability); the earth station circuit can be switched on (the circuit is switched on quickly) only by setting the earth station circuit; meanwhile, the system can receive at multiple places, and can economically realize broadcasting and multiple access communication (multiple access characteristic); the circuit is very flexible in arrangement, and excessively centralized telephone traffic can be dispersed at any time; the same channel can be used for different directions or different intervals (multiple access).
In the field of communications, a signal is a physical quantity representing a message, such as an electrical signal that may represent different messages by variations in amplitude, frequency, and phase. Interference refers to impairment of reception of a useful signal. The interference is generally caused by two, crosstalk: a coupling phenomenon between two signal lines in electronics. Radio interference: the behaviors of destroying communication and preventing broadcasting station signals are achieved by a mode of reducing the signal-to-noise ratio by sending radio signals.
The satellite communication system includes all devices for communication and guaranteed communication. The system is generally composed of a space subsystem, a communication earth station, a tracking, remote measuring and instruction subsystem and a monitoring and management subsystem.
1. Tracking remote measuring and instruction subsystem: the tracking, remote measuring and command subsystem is responsible for tracking and measuring the satellite and controlling the satellite to accurately enter a designated position on a static orbit. After the satellite normally operates, the orbit position correction and the attitude maintenance are carried out on the satellite regularly.
2. Monitoring management subsystem: the monitoring management subsystem is responsible for detecting and controlling communication performance of a fixed-point satellite before and after service opening, such as basic communication parameters of satellite transponder power, satellite antenna gain, power transmitted by each earth station, radio frequency, bandwidth and the like, so as to ensure normal communication.
3. Spatial subsystem (communication satellite): the communication satellite mainly comprises a communication system, a telemetering command device, a control system, a power supply device (comprising a solar battery and a storage battery) and the like. A communication system is the main body of a communication satellite and essentially comprises one or more transponders, each of which is capable of simultaneously receiving and retransmitting signals from a plurality of earth stations, thereby functioning as a relay station.
4. A communication earth station: the communication earth station is a microwave radio receiving and transmitting station, and users access a satellite line through the microwave radio receiving and transmitting station to carry out communication.
Since the satellite network we want to monitor is not designed by us, we usually need to extract the signal characteristic parameters by using various signal analysis tools, such as: unique code, decoding specification, scrambling specification, and frame planning specification, and then design our demodulation equipment based on these parameters. In a traditional satellite monitoring system, the adaptive carrier receiving equipment can only traverse all specifications during decoding to solve correct data. Such devices have a low overall received symbol rate (because the received symbol rate is heavily dependent on the speed of the decoder, which adds a lot of logical resources if multiple decoders are used) and must be used in case the baseband frame carries a CRC indication. In order to solve the problem, a frame plan guiding mode is required to be adopted to indicate the decoding specification of the current burst, so that the situation that a decoder needs to traverse to correctly decode is avoided; meanwhile, the limitation that the baseband frame must carry CRC indication application scenes is removed. In order to use frame planning guidance, synchronization of the frame plan must be realized, and therefore, a synchronization method of the frame plan is important.
The offline frame plan can guide the whole network small station to receive without receiving the carrier signal of the main station, but the application scene is limited. It can only receive the application scene that the frame plan is unchanged in a period of time, but can not solve the application scene that the frame plan changes in real time. In order to solve the application scenario of real-time change of the frame plan, it is necessary to receive the carrier of the master station and extract the frame plan in real time according to the carrier indication.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a real-time frame synchronization system and method based on a satellite communication countermeasure system, which can realize real-time change of frame plan under the condition of ensuring that the superframe period is not changed; meanwhile, the invention also has the advantages of wide applicability and resource saving.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a real-time frame synchronization system for a satellite communication based countermeasure system, the system comprising: the system comprises: the device comprises a signal processing device, a processor and an upper computer; the signal processor device is in signal connection with the processor; the processor is respectively in signal connection with the signal processing device and the upper computer; the upper computer sends the parameters for receiving the master station signals to the processor; the processor is used for sending the parameters of the master station signals to the signal processing device, extracting a frame plan table and sending the frame plan table to the signal processing device; the signal processing device, the step of processing the signal at least comprises: and receiving parameters of a master station signal from a processor and a frame schedule table, performing frame synchronization guidance and decoding guidance, and performing frame synchronization and decoding work after the frame synchronization guidance and the decoding guidance according to the frame schedule table and the NCR time information extracted from the received signal.
Further, the signal processing apparatus includes: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a DVB receiving unit, an NCR synchronization counter unit, a frame synchronization guiding unit, a timestamp adding unit and a decoding guiding unit; the analog-to-digital converter is connected with the digital down-conversion unit through signals; the digital down-conversion unit is respectively connected with the frame synchronization unit and the analog-to-digital converter through signals; the frame synchronization unit is respectively in signal connection with the demodulator, the digital down-conversion unit, the frame synchronization guiding unit and the timestamp adding unit; the demodulator is respectively connected with the frame synchronization unit, the timestamp adding unit and the decoder through signals; the decoder is respectively connected with the demodulator, the decoding guide unit and the upper computer through signals; the DVB receiving unit is respectively connected with the processor and the NCR synchronous counter unit through signals; the NCR synchronous counter unit is respectively connected with the frame synchronization guiding unit, the timestamp adding unit, the DVB receiving unit and the processor through signals; the frame synchronization guiding unit is respectively connected with the frame synchronization unit, the NCR synchronization counter unit and the processor through signals; the time stamp adding unit is respectively connected with the NCR synchronous counter unit, the frame synchronous unit, the demodulator and the decoding guide unit through signals; the decoding guide unit is respectively connected with the decoder, the timestamp adding unit and the processor through signals; the processor is respectively in signal connection with the DVB receiving unit, the NCR synchronous counter unit, the frame synchronization guiding unit, the decoding guiding unit and the upper computer; and the upper computer is respectively in signal connection with the processor and the decoder.
Further, the parameters of the primary station signal at least include: unique code, decoding specification, scrambling specification and frame plan specification of the primary station signal.
Furthermore, the frame synchronization guiding unit indicates the decoding specification of the current burst, so that the decoder can correctly decode without traversing.
A real-time frame synchronization method for a satellite communication based countermeasure system, the method performing the steps of:
step S1: extracting and issuing a frame plan;
step S2: guidance for frame planning is performed.
Further, the step S1: the method for extracting and issuing the frame plan sequentially executes the following steps: the signal processing device collects signals sent by the master station; analyzing the signaling specification of the main station and a frame schedule; the upper computer sends the signal parameters of the receiving master station to the processor; the processor transmits the received signal parameters of the main station to the DVB receiving unit; a demodulator in the signal processing device locks and sends the received data to a processor; the processor analyzes the signaling according to the master station signaling specification extracted by the signal processing device and extracts a frame planning table; the processor sends the extracted frame plan to the frame synchronization guiding unit and the decoding unit in real time.
Further, the step S2: the method for guiding frame planning sequentially executes the following steps: after receiving the signal, the DVB receiving unit extracts a frame plan table, and the processor issues a frame synchronization parameter corresponding to the whole superframe time information to the frame synchronization guiding unit and issues a whole decoding parameter to the decoding guiding unit according to the received frame plan table; the frame synchronization guiding unit guides the frame synchronization unit to work according to the time information provided by the NCR synchronization counter; the decoding guide unit guides the decoder to work according to the time information provided by the NCR synchronous counter.
Further, the signal processing apparatus includes: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a DVB receiving unit, an NCR synchronization counter unit, a frame synchronization guiding unit, a timestamp adding unit and a decoding guiding unit; the analog-to-digital converter is connected with the digital down-conversion unit through signals; the digital down-conversion unit is respectively connected with the frame synchronization unit and the analog-to-digital converter through signals; the frame synchronization unit is respectively in signal connection with the demodulator, the digital down-conversion unit, the frame synchronization guiding unit and the timestamp adding unit; the demodulator is respectively connected with the frame synchronization unit, the timestamp adding unit and the decoder through signals; the decoder is respectively connected with the demodulator, the decoding guide unit and the upper computer through signals; the DVB receiving unit is respectively connected with the processor and the NCR synchronous counter unit through signals; the NCR synchronous counter unit is respectively connected with the frame synchronization guiding unit, the timestamp adding unit, the DVB receiving unit and the processor through signals; the frame synchronization guiding unit is respectively connected with the frame synchronization unit, the NCR synchronization counter unit and the processor through signals; the time stamp adding unit is respectively connected with the NCR synchronous counter unit, the frame synchronous unit, the demodulator and the decoding guide unit through signals; the decoding guide unit is respectively connected with the decoder, the timestamp adding unit and the processor through signals; the processor is respectively in signal connection with the DVB receiving unit, the NCR synchronous counter unit, the frame synchronization guiding unit, the decoding guiding unit and the upper computer; and the upper computer is respectively in signal connection with the processor and the decoder.
Further, the parameters of the primary station signal at least include: unique code, decoding specification, scrambling specification and frame plan specification of the primary station signal.
Furthermore, the frame synchronization guiding unit indicates the decoding specification of the current burst, so that the decoder can correctly decode without traversing.
The real-time frame synchronization system and method based on the satellite communication countermeasure system have the following beneficial effects:
1. the applicability is wide: the invention can still be used under the condition that the baseband frame does not carry CRC indication;
2. the use is convenient: the invention extracts the frame plan in real time by receiving the signal of the main station, and does not need to import the frame plan offline in the using process;
3. powerful: the invention can realize the application scene of planning real-time change of each superframe frame;
4. the resources are saved: the invention can guide the frame synchronization module and the demodulation module, and can greatly save resources.
Drawings
Fig. 1 is a schematic structural diagram of an overall structure of a physical layer of a satellite communication network according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a frame structure of a satellite communication MF-TDMA network according to an embodiment of the present invention;
fig. 3 is a schematic system structure diagram of a real-time frame synchronization system based on a satellite communication countermeasure system according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for real-time frame synchronization based on a satellite communication countermeasure system according to an embodiment of the present invention.
Detailed Description
The method of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments of the invention.
Example 1
As shown in fig. 1, a real-time frame synchronization system of a satellite communication based countermeasure system, the system comprising: the system comprises: the device comprises a signal processing device, a processor and an upper computer; the signal processor device is in signal connection with the processor; the processor is respectively in signal connection with the signal processing device and the upper computer; the upper computer provides the function of transmitting the parameters for receiving the master station signals to the processor for the operator; the processor is used for sending the parameters of the master station signals to the signal processing device, extracting a frame plan table and sending the frame plan table to the signal processing device; the signal processing device, the step of processing the signal at least comprises: and receiving parameters of a master station signal from a processor and a frame schedule table, performing frame synchronization guidance and decoding guidance, and performing frame synchronization and decoding work after the frame synchronization guidance and the decoding guidance according to the frame schedule table and the NCR time information extracted from the received signal.
Specifically, since the satellite network to be monitored is not designed by itself, it is usually necessary to extract signal characteristic parameters by using various signal analysis tools, such as: unique code, decoding specification, scrambling specification, and frame planning specification, and then design our demodulation equipment based on these parameters. In a traditional satellite monitoring system, the adaptive carrier receiving equipment can only traverse all specifications during decoding to solve correct data. Such devices have a low overall received symbol rate (because the received symbol rate is heavily dependent on the speed of the decoder, which adds a lot of logical resources if multiple decoders are used) and must be used in case the baseband frame carries a CRC indication. In order to solve the problem, a frame plan guiding mode is required to be adopted to indicate the decoding specification of the current burst, so that the situation that a decoder needs to traverse to correctly decode is avoided; meanwhile, the limitation that the baseband frame must carry CRC indication application scenes is removed. In order to use frame planning guidance, synchronization of the frame plan must be realized, and therefore, a synchronization method of the frame plan is important.
The offline frame plan can guide the whole network small station to receive without receiving the carrier signal of the main station, but the application scene is limited. It can only receive the application scene that the frame plan is unchanged in a period of time, but can not solve the application scene that the frame plan changes in real time. In order to solve the application scenario of real-time change of the frame plan, it is necessary to receive the carrier of the master station and extract the frame plan in real time according to the carrier indication.
Example 2
On the basis of the above embodiment, the signal processing apparatus includes: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a DVB receiving unit, an NCR synchronization counter unit, a frame synchronization guiding unit, a timestamp adding unit and a decoding guiding unit; the analog-to-digital converter is connected with the digital down-conversion unit through signals; the digital down-conversion unit is respectively connected with the frame synchronization unit and the analog-to-digital converter through signals; the frame synchronization unit is respectively in signal connection with the demodulator, the digital down-conversion unit, the frame synchronization guiding unit and the timestamp adding unit; the demodulator is respectively connected with the frame synchronization unit, the timestamp adding unit and the decoder through signals; the decoder is respectively connected with the demodulator, the decoding guide unit and the upper computer through signals; the DVB receiving unit is respectively connected with the processor and the NCR synchronous counter unit through signals; the NCR synchronous counter unit is respectively connected with the frame synchronization guiding unit, the timestamp adding unit, the DVB receiving unit and the processor through signals; the frame synchronization guiding unit is respectively connected with the frame synchronization unit, the NCR synchronization counter unit and the processor through signals; the time stamp adding unit is respectively connected with the NCR synchronous counter unit, the frame synchronous unit, the demodulator and the decoding guide unit through signals; the decoding guide unit is respectively connected with the decoder, the timestamp adding unit and the processor through signals; the processor is respectively in signal connection with the DVB receiving unit, the NCR synchronous counter unit, the frame synchronization guiding unit, the decoding guiding unit and the upper computer; and the upper computer is respectively in signal connection with the processor and the decoder.
In particular, before implementing the invention, it has been fully analyzed and made clear that all physical layer specifications currently required to monitor the MF-TDMA network and the frame plan specifications it employs; all specifications of the demodulator are realized in a non-boot mode; all specifications of the decoder are realized; the clock synchronization of the entire network of the NCR is realized.
Example 3
On the basis of the above embodiment, the parameters of the primary station signal at least include: unique code, decoding specification, scrambling specification and frame plan specification of the primary station signal.
Example 4
Based on the above embodiment, the frame synchronization guiding unit indicates the decoding specification of the current burst, so that the decoder can decode correctly without traversing.
Example 5
A real-time frame synchronization method for a satellite communication based countermeasure system, the method performing the steps of:
step S1: extracting and issuing a frame plan;
step S2: guidance for frame planning is performed.
Example 6
On the basis of the above embodiment, the step S1: the method for extracting and issuing the frame plan sequentially executes the following steps: the signal processing device collects signals sent by the master station; analyzing the signaling specification of the main station and a frame schedule; the upper computer sends the signal parameters of the receiving master station to the processor; the processor transmits the received signal parameters of the main station to the DVB receiving unit; a demodulator in the signal processing device locks and sends the received data to a processor; the processor analyzes the signaling according to the master station signaling specification extracted by the signal processing device and extracts a frame planning table; the processor sends the extracted frame plan to the frame synchronization guiding unit and the decoding unit in real time.
Example 7
On the basis of the above embodiment, the step S2: the method for guiding frame planning sequentially executes the following steps: after receiving the signal, the DVB receiving unit extracts a frame plan table, and the processor issues a frame synchronization parameter corresponding to the whole superframe time information to the frame synchronization guiding unit and issues a whole decoding parameter to the decoding guiding unit according to the received frame plan table; the frame synchronization guiding unit guides the frame synchronization unit to work according to the time information provided by the NCR synchronization counter; the decoding guide unit guides the decoder to work according to the time information provided by the NCR synchronous counter.
The invention mainly comprises the following steps: frame plan extraction and transmission and frame plan guide. The specific implementation process is as follows:
frame plan extraction and issuing: collecting signals sent by a master station; analyzing the main station signaling specification by using a signal analysis tool; the equipment is powered on, and parameters of the master station signals are received to the CPU through the upper computer configuration; the CPU processor transmits the parameter information to the DVB receiving module; after the demodulator is locked, sending the received data to a CPU processor; the CPU extracts a frame plan form according to a signaling analysis method extracted by the signaling analysis tool; and the CPU processor sends the extracted frame schedule to the frame synchronization guide module and the decoding guide module in real time.
A decoding guiding step: the equipment is powered on, and the CPU processor issues frame synchronization parameters and decoding parameters corresponding to the whole superframe time information to a corresponding guide module according to a frame schedule extracted by receiving DVB signals; and the guide module guides the corresponding module to work according to the NCR time information.
Example 8
On the basis of the above embodiment, the signal processing apparatus includes: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a DVB receiving unit, an NCR synchronization counter unit, a frame synchronization guiding unit, a timestamp adding unit and a decoding guiding unit; the analog-to-digital converter is connected with the digital down-conversion unit through signals; the digital down-conversion unit is respectively connected with the frame synchronization unit and the analog-to-digital converter through signals; the frame synchronization unit is respectively in signal connection with the demodulator, the digital down-conversion unit, the frame synchronization guiding unit and the timestamp adding unit; the demodulator is respectively connected with the frame synchronization unit, the timestamp adding unit and the decoder through signals; the decoder is respectively connected with the demodulator, the decoding guide unit and the upper computer through signals; the DVB receiving unit is respectively connected with the processor and the NCR synchronous counter unit through signals; the NCR synchronous counter unit is respectively connected with the frame synchronization guiding unit, the timestamp adding unit, the DVB receiving unit and the processor through signals; the frame synchronization guiding unit is respectively connected with the frame synchronization unit, the NCR synchronization counter unit and the processor through signals; the time stamp adding unit is respectively connected with the NCR synchronous counter unit, the frame synchronous unit, the demodulator and the decoding guide unit through signals; the decoding guide unit is respectively connected with the decoder, the timestamp adding unit and the processor through signals; the processor is respectively in signal connection with the DVB receiving unit, the NCR synchronous counter unit, the frame synchronization guiding unit, the decoding guiding unit and the upper computer; and the upper computer is respectively in signal connection with the processor and the decoder.
Example 9
On the basis of the above embodiment, the parameters of the primary station signal at least include: unique code, decoding specification, scrambling specification and frame plan specification of the primary station signal.
Example 10
Based on the above embodiment, the frame synchronization guiding unit indicates the decoding specification of the current burst, so that the decoder can decode correctly without traversing.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related description of the system described above may refer to the corresponding process in the foregoing method embodiments, and will not be described herein again.
It should be noted that, the system provided in the foregoing embodiment is only illustrated by dividing the functional modules, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the modules or steps in the embodiment of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not to be construed as unduly limiting the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and related descriptions of the storage device and the processing device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Those of skill in the art would appreciate that the various illustrative modules, method steps, and modules described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that programs corresponding to the software modules, method steps may be located in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. A real-time frame synchronization system for a satellite communication based countermeasure system, the system comprising: the device comprises a signal processing device, a processor and an upper computer; the signal processing device is in signal connection with the processor; the processor is respectively in signal connection with the signal processing device and the upper computer; the system is characterized in that the upper computer sends parameters for receiving signals of the master station to the processor; the processor is used for sending the parameters of the master station signals to the signal processing device, extracting a frame plan table and sending the frame plan table to the signal processing device; the signal processing device, the step of processing the signal at least comprises: receiving parameters of a master station signal from a processor and a frame schedule table, performing frame synchronization guidance and decoding guidance, and performing frame synchronization and decoding work after the frame synchronization guidance and the decoding guidance according to the frame schedule table and NCR time information extracted from the received signal;
the signal processing apparatus includes: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a DVB receiving unit, an NCR synchronization counter unit, a frame synchronization guiding unit, a timestamp adding unit and a decoding guiding unit; the analog-to-digital converter is connected with the digital down-conversion unit through signals; the digital down-conversion unit is respectively connected with the frame synchronization unit and the analog-to-digital converter through signals; the frame synchronization unit is respectively in signal connection with the demodulator, the digital down-conversion unit, the frame synchronization guiding unit and the timestamp adding unit; the demodulator is respectively connected with the frame synchronization unit, the timestamp adding unit and the decoder through signals; the decoder is respectively connected with the demodulator, the decoding guide unit and the upper computer through signals; the DVB receiving unit is respectively connected with the processor and the NCR synchronous counter unit through signals; the NCR synchronous counter unit is respectively connected with the frame synchronization guiding unit, the timestamp adding unit, the DVB receiving unit and the processor through signals; the frame synchronization guiding unit is respectively connected with the frame synchronization unit, the NCR synchronization counter unit and the processor through signals; the time stamp adding unit is respectively connected with the NCR synchronous counter unit, the frame synchronous unit, the demodulator and the decoding guide unit through signals; the decoding guide unit is respectively connected with the decoder, the timestamp adding unit and the processor through signals; the processor is respectively in signal connection with the DVB receiving unit, the NCR synchronous counter unit, the frame synchronization guiding unit, the decoding guiding unit and the upper computer; and the upper computer is respectively in signal connection with the processor and the decoder.
2. The system of claim 1, wherein the parameters of the primary station signal include at least: unique code, decoding specification, scrambling specification and frame plan specification of the primary station signal.
3. The system of claim 2, wherein the frame synchronization guidance unit indicates a decoding specification of the current burst such that the decoder can correctly decode without traversal.
4. A real-time frame synchronization method based on a satellite communication countermeasure system based on the system of one of claims 1 to 3, characterized in that it performs the following steps:
step S1: extracting and issuing a frame plan;
step S2: guidance for frame planning is performed.
5. The method of claim 4, wherein the step S1: the method for extracting and issuing the frame plan sequentially executes the following steps: the signal processing device collects signals sent by the master station; analyzing the signaling specification of the main station and a frame schedule; the upper computer sends the signal parameters of the receiving master station to the processor; the processor transmits the received signal parameters of the main station to the DVB receiving unit; a demodulator in the signal processing device locks and sends the received data to a processor; the processor analyzes the signaling according to the master station signaling specification extracted by the signal processing device and extracts a frame planning table; the processor sends the extracted frame plan to the frame synchronization guiding unit and the decoding unit in real time.
6. The method of claim 5, wherein the step S2: the method for guiding frame planning sequentially executes the following steps: after receiving the signal, the DVB receiving unit extracts a frame plan table, and the processor issues a frame synchronization parameter corresponding to the whole superframe time information to the frame synchronization guiding unit and issues a whole decoding parameter to the decoding guiding unit according to the received frame plan table; the frame synchronization guiding unit guides the frame synchronization unit to work according to the time information provided by the NCR synchronization counter; the decoding guide unit guides the decoder to work according to the time information provided by the NCR synchronous counter.
7. The method of claim 6, wherein the signal processing means comprises: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a DVB receiving unit, an NCR synchronization counter unit, a frame synchronization guiding unit, a timestamp adding unit and a decoding guiding unit; the analog-to-digital converter is connected with the digital down-conversion unit through signals; the digital down-conversion unit is respectively connected with the frame synchronization unit and the analog-to-digital converter through signals; the frame synchronization unit is respectively in signal connection with the demodulator, the digital down-conversion unit, the frame synchronization guiding unit and the timestamp adding unit; the demodulator is respectively connected with the frame synchronization unit, the timestamp adding unit and the decoder through signals; the decoder is respectively connected with the demodulator, the decoding guide unit and the upper computer through signals; the DVB receiving unit is respectively connected with the processor and the NCR synchronous counter unit through signals; the NCR synchronous counter unit is respectively connected with the frame synchronization guiding unit, the timestamp adding unit, the DVB receiving unit and the processor through signals; the frame synchronization guiding unit is respectively connected with the frame synchronization unit, the NCR synchronization counter unit and the processor through signals; the time stamp adding unit is respectively connected with the NCR synchronous counter unit, the frame synchronous unit, the demodulator and the decoding guide unit through signals; the decoding guide unit is respectively connected with the decoder, the timestamp adding unit and the processor through signals; the processor is respectively in signal connection with the DVB receiving unit, the NCR synchronous counter unit, the frame synchronization guiding unit, the decoding guiding unit and the upper computer; and the upper computer is respectively in signal connection with the processor and the decoder.
8. The method of claim 7, wherein the parameters of the primary station signals include at least: unique code, decoding specification, scrambling specification and frame plan specification of the primary station signal.
9. The method of claim 8, wherein the frame synchronization guidance unit indicates a decoding specification of the current burst such that the decoder can correctly decode without traversal.
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| CN202010339088.5A CN111711476B (en) | 2020-04-26 | 2020-04-26 | Real-time frame synchronization system and method based on satellite communication countermeasure system |
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