CN111711508B - User interference system, method and device based on satellite communication countermeasure - Google Patents
User interference system, method and device based on satellite communication countermeasure Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04K3/60—Jamming involving special techniques
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Abstract
The invention belongs to the technical field of satellite communication, and particularly relates to a user interference system, method and device based on satellite communication countermeasure. The system comprises: the system 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 connected with the signal processing device and the upper computer in a signal way; the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference moment point and the interference moment point to the processor; and the processor controls the operation of the signal processing device to finish interference according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point issued by the upper computer. The method can be used for interfering users in the satellite communication network and has the advantages of good concealment and high interference efficiency.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and particularly relates to a user interference system, method and device based on satellite communication countermeasure.
Background
Satellite communication is simply communication between radio stations on earth (including the ground and the lower atmosphere) using satellites as relays. Satellite communication systems consist of two parts, satellite and 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 communication is within the range covered by the electric wave emitted by the satellite; is not easily affected by land disasters (high reliability); the earth station circuit can be opened (the opening circuit is rapid) only by setting the earth station circuit; meanwhile, the system can be received at a plurality of places, and can economically realize broadcast and multiple access communication (multiple access characteristic); the circuit is very flexible to set, and can disperse the telephone traffic which is too concentrated at any time; the same channel may be used for different directions or for different intervals (multiple access).
In the field of communications, a signal is a physical quantity representing a message, e.g. an electrical signal may represent a different message by a change in amplitude, frequency, phase. Interference refers to impairment of the reception of useful signals. Interference is generally caused by crosstalk, which is two of the following: and a coupling phenomenon between the two signal lines electronically. Radio interference: the actions of destroying communication and preventing broadcasting station signals are achieved by transmitting radio signals to reduce the signal-to-noise ratio.
The satellite communication system includes all devices that communicate and secure communications. The system generally comprises a space subsystem, a communication earth station, a tracking telemetry and instruction subsystem, a monitoring management subsystem and the like.
1. Tracking telemetry and instruction subsystem: the tracking telemetry and instruction 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 satellite is subjected to orbit position correction and attitude maintenance at regular intervals.
2. Monitoring management subsystem: the monitoring management subsystem is responsible for detecting and controlling communication performance of the fixed-point satellite before and after service opening, such as satellite transponder power, satellite antenna gain, and basic communication parameters such as power, radio frequency and bandwidth emitted by each earth station, so as to ensure normal communication.
3. Space subsystem (communication satellite): the communication satellite mainly comprises a communication system, a telemetry instruction device, a control system, a power supply device (comprising a solar battery and a storage battery) and the like. A communication system is a body on a communication satellite and mainly includes one or more transponders, each of which can simultaneously receive and retransmit signals of a plurality of earth stations, thereby functioning as a relay station.
4. Communication earth station: the communication earth station is a microwave radio transceiver station through which users access satellite lines for communication.
Disclosure of Invention
In view of the above, a main object of the present invention is to provide a system, a method and a device for user interference based on satellite communication countermeasure, which can interfere with users in a satellite communication network, and has advantages of good concealment and high interference efficiency.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a satellite communication countermeasure based user interference system, the system comprising: the system 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 connected with the signal processing device and the upper computer in a signal way; the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference moment point and the interference moment point to the processor; the processor controls the operation of the signal processing device to finish interference according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point issued by the upper computer; the signal processing device, the step of carrying out signal processing at least comprises: collecting signals; analog-to-digital conversion of the signal; acquiring a signaling specification and a frame schedule of a master station through signal analysis; issuing a frame schedule to a processor; under the control of the processor, completing frame plan alignment; user interference is accomplished under the control of the processor.
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 digital-to-analog converter, a carrier superposition unit, a digital up-conversion unit, an interference processing unit, a super frame counter, a time stamp processing unit and a decoding guiding unit; the digital-to-analog converter is in signal connection with the digital down-conversion unit; the digital down-conversion unit is in signal connection with the frame synchronization unit; the frame synchronization unit is respectively connected with the demodulator, the digital down-conversion unit and the timestamp processing unit in a signal manner; the demodulator is respectively connected with the decoder, the frame synchronization unit and the timestamp processing unit in a signal manner; the decoder is respectively connected with the upper computer, the demodulator and the decoding guide unit in a signal manner; the digital-to-analog converter is in signal connection with the carrier superposition unit; the carrier superposition units are respectively connected with the digital up-conversion unit and the digital analog converter in a signal manner; the digital up-conversion unit is respectively connected with the carrier superposition unit, the interference processing unit, the processor and the carrier superposition unit in a signal manner; the signal of the interference processing unit is respectively connected with the super frame counter, the digital up-conversion unit and the processor through signals; the super frame counter is respectively connected with the processor, the time stamp processing unit and the interference processing unit in a signal mode; the time stamp processing unit is respectively connected with the demodulator, the interference processing unit, the decoding guiding unit, the super frame counter and the processor in a signal manner; the decoding guiding unit is respectively connected with the processor, the time stamp processing unit and the decoder in a signal mode.
Further, the timestamp processing unit includes: a time stamp adding subunit and a time stamp recording subunit; the time stamp adding subunit is respectively connected with the super frame counter, the time stamp recording subunit, the decoding guiding unit and the demodulator in a signal manner; the time stamp recording subunit is respectively connected with the frame synchronizing unit, the processor and the time stamp adding subunit in a signal mode.
Further, the time interference processing unit includes: an interference physical frame subunit and an interference starting point subunit; the interference physical frame subunit is respectively connected with the digital up-conversion unit, the interference starting point subunit and the processor in a signal manner; the interference starting point subunit is respectively connected with the super frame counter and the interference physical frame subunit in a signal mode.
A method of user interference based on satellite communication countermeasure, the method performing the steps of:
step S1: frame plan extraction and issuing are carried out;
step S2: performing frame plan alignment;
step S3: user interference is performed.
Further, the step S1: the method for extracting and issuing the frame plan sequentially comprises the following steps: the signal processing device collects signals sent by the main station; analyzing a signaling specification and a frame schedule of a master station; and issuing a frame schedule to the processor.
Further, the step S2: the method for performing frame plan alignment sequentially performs the steps of: step S2.1: the superframe counter circularly counts according to the superframe period; step S2.2: when the demodulator captures the burst frame head, the time stamp adding subunit records the moment of the current burst in the super frame and simultaneously transmits the recorded value to the time stamp recording subunit; step S2.3: at the end of each superframe period, the superframe counter informs the processor in the form of an interrupt; step S2.4: the processor acquires burst time points recorded by the time stamp adding subunit at fixed time according to the received superframe interrupt signal; step S2.5: the processor compares the obtained burst time information with the time information of the frame plan to calculate the deviation time of the super-frame counter; step S2.6: the processor issues the deviation time to the superframe counter; step S2.7: the superframe counter corrects the value of the counter according to the deviation time; step S2.8: steps S2.2 to S2.7 are looped until the superframe counter is completely aligned with the frame schedule time information.
Further, the step S3: the method for performing user interference sequentially performs the following steps: step S3.1: the signal processing device transmits an offline frame schedule to the processor; step S3.2: the processor issues the received frame schedule to the decoding guiding unit and completes frame schedule alignment; step S3.3: calculating the space transmission time delay according to GPS information and orbit position information of the satellite; step S3.4: recording the power and length information of a certain user burst according to the time captured by the superframe counter and the frame synchronization module; step S3.5: calculating a time slot starting point according to the value of the superframe counter and the air transmission delay; step S3.6: calculating an interference starting point according to the frame schedule, the time slot starting point and the burst power information of a certain user recorded by the time stamp recording module; step S3.7: and the processor transmits interference data according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point which are issued by the upper computer.
An apparatus for a satellite communication countermeasure based user interference method, the apparatus being a non-transitory computer readable storage medium storing computing instructions, comprising: code segments for frame plan extraction and issuing are carried out; code segments for performing frame plan alignment; code segments that do user interference.
Further, the storage medium is also stored with a code segment for preprocessing; all physical layer specifications of the MF-TDMA network that the code segment has obtained and the frame plan specifications it employs; all specifications of the demodulator can be realized in the non-boot mode;
meanwhile, all specifications of the decoder are realized.
The satellite communication countermeasure-based user interference system, method and device have the following beneficial effects: the invention uses carrier interference method, which only interferes the load information after unique code for each user burst signal, to make the target network receive the incorrect data because of low signal-to-noise ratio. The method has the advantages of strong concealment and high interference efficiency.
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 user interference system based on satellite communication countermeasure according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an interference process of a system, a method and a device for user interference based on satellite communication countermeasure according to an embodiment of the present invention.
Detailed Description
The method of the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, a system for user interference based on satellite communication countermeasure, the system comprising: the system 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 connected with the signal processing device and the upper computer in a signal way; the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference moment point and the interference moment point to the processor; the processor controls the operation of the signal processing device to finish interference according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point issued by the upper computer; the signal processing device, the step of carrying out signal processing at least comprises: collecting signals; analog-to-digital conversion of the signal; acquiring a signaling specification and a frame schedule of a master station through signal analysis; issuing a frame schedule to a processor; under the control of the processor, completing frame plan alignment; user interference is accomplished under the control of the processor.
Specifically, MF-TDMA satellite networks are divided into mesh networks and star networks, both of which are composed of a master station and a number of small stations. The mesh network master station transmits continuous or burst carrier waves, the small station transmits burst carrier waves, and the small station can directly communicate; the star network master transmits a continuous carrier wave, the small stations transmit a burst carrier wave, and communication between the small stations must be performed through the master (i.e., the small stations transmit data to the master first and then the master forwards the data to another small station).
The satellite communication device is composed of a transmitting unit and a receiving unit. The transmitting unit is divided into: baseband frame encapsulation, encoding, interleaving, physical frame framing, digital up-converter and DAC (digital-to-analog converter); the receiving unit is divided into: baseband de-encapsulation, decoding, de-interleaving, demodulator, digital down-converter and ADC (analog to digital converter).
FIG. 1 is a physical layer overall structure of a satellite communication network, wherein an aerial transmission signal in an MF-TDMA communication system takes superframes as reference units in time, and each superframe is equal in length; the super frame comprises a plurality of subframes, and the lengths of the subframes can be unequal; each subframe in turn contains several slots, one burst per slot, or one burst for multiple slots. Frame planning in MF-TDMA systems actually refers to the physical layer specifications (e.g., symbol rate, unique code, pilot frequency, modulation scheme, code rate, code length, etc.) of the transmitted signal at a certain moment.
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 digital-to-analog converter, a carrier superposition unit, a digital up-conversion unit, an interference processing unit, a super frame counter, a time stamp processing unit and a decoding guiding unit; the digital-to-analog converter is in signal connection with the digital down-conversion unit; the digital down-conversion unit is in signal connection with the frame synchronization unit; the frame synchronization unit is respectively connected with the demodulator, the digital down-conversion unit and the timestamp processing unit in a signal manner; the demodulator is respectively connected with the decoder, the frame synchronization unit and the timestamp processing unit in a signal manner; the decoder is respectively connected with the upper computer, the demodulator and the decoding guide unit in a signal manner; the digital-to-analog converter is in signal connection with the carrier superposition unit; the carrier superposition units are respectively connected with the digital up-conversion unit and the digital analog converter in a signal manner; the digital up-conversion unit is respectively connected with the carrier superposition unit, the interference processing unit, the processor and the carrier superposition unit in a signal manner; the signal of the interference processing unit is respectively connected with the super frame counter, the digital up-conversion unit and the processor through signals; the super frame counter is respectively connected with the processor, the time stamp processing unit and the interference processing unit in a signal mode; the time stamp processing unit is respectively connected with the demodulator, the interference processing unit, the decoding guiding unit, the super frame counter and the processor in a signal manner; the decoding guiding unit is respectively connected with the processor, the time stamp processing unit and the decoder in a signal mode.
Example 3
On the basis of the above embodiment, the time stamp processing unit includes: a time stamp adding subunit and a time stamp recording subunit; the time stamp adding subunit is respectively connected with the super frame counter, the time stamp recording subunit, the decoding guiding unit and the demodulator in a signal manner; the time stamp recording subunit is respectively connected with the frame synchronizing unit, the processor and the time stamp adding subunit in a signal mode.
Example 4
On the basis of the above embodiment, the time interference processing unit includes: an interference physical frame subunit and an interference starting point subunit; the interference physical frame subunit is respectively connected with the digital up-conversion unit, the interference starting point subunit and the processor in a signal manner; the interference starting point subunit is respectively connected with the super frame counter and the interference physical frame subunit in a signal mode.
Example 5
A method of user interference based on satellite communication countermeasure, the method performing the steps of:
step S1: frame plan extraction and issuing are carried out;
step S2: performing frame plan alignment;
step S3: user interference is performed.
Example 6
On the basis of the above embodiment, the step S1: the method for extracting and issuing the frame plan sequentially comprises the following steps: the signal processing device collects signals sent by the main station; analyzing a signaling specification and a frame schedule of a master station; and issuing a frame schedule to the processor.
Example 7
On the basis of the above embodiment, the step S2: the method for performing frame plan alignment sequentially performs the steps of: step S2.1: the superframe counter circularly counts according to the superframe period; step S2.2: when the demodulator captures the burst frame head, the time stamp adding subunit records the moment of the current burst in the super frame and simultaneously transmits the recorded value to the time stamp recording subunit; step S2.3: at the end of each superframe period, the superframe counter informs the processor in the form of an interrupt; step S2.4: the processor acquires burst time points recorded by the time stamp adding subunit at fixed time according to the received superframe interrupt signal; step S2.5: the processor compares the obtained burst time information with the time information of the frame plan to calculate the deviation time of the super-frame counter; step S2.6: the processor issues the deviation time to the superframe counter; step S2.7: the superframe counter corrects the value of the counter according to the deviation time; step S2.8: steps S2.2 to S2.7 are looped until the superframe counter is completely aligned with the frame schedule time information.
Fig. 2 is a frame structure of a star communication MF-TDMA network. In view of the architecture of the MF-TDMA network carrier, the satellite interference system is divided into: carrier interference and full network interference. Full-network interference may in fact also be referred to as full-network suppression, i.e.: the whole satellite communication network of the other party is paralyzed. The whole network interference method is simple, the interference to the whole MF-TDMA network can be realized only by the interference master station transmitting carrier waves, the whole network interference does not need to be considered and is not doubt caused by the other party, and once the whole network is interfered, the interference from a third party is ensured. The method of carrier interference is relatively difficult because it is considered that the user is not suspicious of interference from his own communication equipment when the carrier is interfering.
In the carrier interference system, a set of small stations identical to the opposite network needs to be designed, and when the demodulator identical to the opposite network exists, the power and the time point needed to be transmitted can be calculated, so that the purpose of carrier interference is achieved. Since the satellite network we want to monitor is not designed by themselves. Therefore, we generally need to extract signal characteristic parameters using various signal analysis tools, such as: parameters such as unique code, decoding specification, scrambling specification, and frame plan specification, and then design our demodulation equipment based on these parameters.
However, the carrier interference system, like the whole network interference system, is also easy for the target to suspect that its own network is interfered, so that the user interference system is induced. As the name implies, user interference refers to interference with a user in an MF-TDMA system and does not leave the target to suspect that its own network is being interfered. Therefore, by using carrier interference, only the burst signal of each user interferes with the payload information after the unique code, so that the target network cannot receive correct data because of low signal-to-noise ratio (which may be due to cloud blocking, heavy rain or other reasons).
Example 8
On the basis of the above embodiment, the step S3: the method for performing user interference sequentially performs the following steps: step S3.1: the signal processing device transmits an offline frame schedule to the processor; step S3.2: the processor issues the received frame schedule to the decoding guiding unit and completes frame schedule alignment; step S3.3: calculating the space transmission time delay according to GPS information and orbit position information of the satellite; step S3.4: recording the power and length information of a certain user burst according to the time captured by the superframe counter and the frame synchronization module; step S3.5: calculating a time slot starting point according to the value of the superframe counter and the air transmission delay; step S3.6: calculating an interference starting point according to the frame schedule, the time slot starting point and the burst power information of a certain user recorded by the time stamp recording module; step S3.7: and the processor transmits interference data according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point which are issued by the upper computer.
Example 9
An apparatus for a satellite communication countermeasure based user interference method, the apparatus being a non-transitory computer readable storage medium storing computing instructions, comprising: code segments for frame plan extraction and issuing are carried out; code segments for performing frame plan alignment; code segments that do user interference.
Example 10
On the basis of the above embodiment, the storage medium further stores a code segment for preprocessing; all physical layer specifications of the MF-TDMA network that the code segment has obtained and the frame plan specifications it employs; all specifications of the demodulator can be realized in the non-boot mode;
meanwhile, all specifications of the decoder are realized.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above and the related description may refer to the corresponding process in the foregoing method embodiment, which is not repeated here.
It should be noted that, in the system provided in the foregoing embodiment, only the division of the foregoing functional modules is illustrated, in practical application, the foregoing functional allocation may be performed by different functional modules, 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 related to the embodiments of the present invention are merely for distinguishing the respective modules or steps, and are not to be construed as unduly limiting the present invention.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the storage device and the processing device described above and the related description may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
Those of skill in the art will appreciate that the various illustrative modules, method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the program(s) corresponding to the software modules, method steps, may be embodied in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, 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. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.
The terms "first," "second," and the like, are used for distinguishing between similar objects and not for describing a particular sequential or chronological order.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus/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/apparatus.
Thus far, the technical solution of the present invention has 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 protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A satellite communication countermeasure based user interference system, the system comprising: the system 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 connected with the signal processing device and the upper computer in a signal way; the method is characterized in that the upper computer transmits interference instructions, interference time points and transmitting power and length corresponding to the interference time points to the processor; the processor controls the operation of the signal processing device to finish interference according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point issued by the upper computer; the signal processing device, the step of carrying out signal processing at least comprises: collecting signals; analog-to-digital conversion of the signal; acquiring a signaling specification and a frame schedule of a master station through signal analysis; issuing a frame schedule to a processor; under the control of the processor, completing frame plan alignment; under the control of the processor, user interference is completed; the signal processing device includes: the device comprises an analog-to-digital converter, a digital down-conversion unit, a frame synchronization unit, a demodulator, a decoder, a digital-to-analog converter, a carrier superposition unit, a digital up-conversion unit, an interference processing unit, a super frame counter, a time stamp processing unit and a decoding guiding unit; the analog-to-digital converter is in signal connection with the digital down-conversion unit; the digital down-conversion unit is in signal connection with the frame synchronization unit; the frame synchronization unit is respectively connected with the demodulator, the digital down-conversion unit and the timestamp processing unit in a signal manner; the demodulator is respectively connected with the decoder, the frame synchronization unit and the timestamp processing unit in a signal manner; the decoder is respectively connected with the upper computer, the demodulator and the decoding guide unit in a signal manner; the digital-to-analog converter is in signal connection with the carrier superposition unit; the carrier superposition units are respectively connected with the digital up-conversion unit and the digital analog converter in a signal manner; the digital up-conversion unit is respectively connected with the carrier superposition unit, the interference processing unit, the processor and the carrier superposition unit in a signal manner; the signal of the interference processing unit is respectively connected with the super frame counter, the digital up-conversion unit and the processor through signals; the super frame counter is respectively connected with the processor, the time stamp processing unit and the interference processing unit in a signal mode; the time stamp processing unit is respectively connected with the demodulator, the interference processing unit, the decoding guiding unit, the super frame counter and the processor in a signal manner; the decoding guiding unit is respectively connected with the processor, the timestamp processing unit and the decoder in a signal manner;
the time stamp processing unit includes: a time stamp adding subunit and a time stamp recording subunit; the time stamp adding subunit is respectively connected with the super frame counter, the time stamp recording subunit, the decoding guiding unit and the demodulator in a signal manner; the time stamp recording subunit is respectively connected with the frame synchronization unit, the processor and the time stamp adding subunit in a signal manner;
the method for performing frame plan alignment sequentially performs the steps of: step S2.1: the superframe counter circularly counts according to the superframe period; step S2.2: when the demodulator captures the burst frame head, the time stamp adding subunit records the moment of the current burst in the super frame and simultaneously transmits the recorded value to the time stamp recording subunit; step S2.3: at the end of each superframe period, the superframe counter informs the processor in the form of an interrupt; step S2.4: the processor acquires burst time points recorded by the time stamp adding subunit at fixed time according to the received superframe interrupt signal; step S2.5: the processor compares the obtained burst time information with the time information of the frame plan to calculate the deviation time of the super-frame counter; step S2.6: the processor issues the deviation time to the superframe counter; step S2.7: the superframe counter corrects the value of the counter according to the deviation time; step S2.8: steps S2.2 to S2.7 are looped until the superframe counter is completely aligned with the frame schedule time information.
2. The system of claim 1, wherein the interference processing unit comprises: an interference physical frame subunit and an interference starting point subunit; the interference physical frame subunit is respectively connected with the digital up-conversion unit, the interference starting point subunit and the processor in a signal manner; the interference starting point subunit is respectively connected with the super frame counter and the interference physical frame subunit in a signal mode.
3. A method of user interference based on satellite communication countermeasure based on the system of one of claims 1 to 2, characterized in that the method performs the following steps:
step S1: frame plan extraction and issuing are carried out;
step S2: performing frame plan alignment;
step S3: user interference is performed.
4. A method according to claim 3, wherein said step S1: the method for extracting and issuing the frame plan sequentially comprises the following steps: the signal processing device collects signals sent by the main station; analyzing a signaling specification and a frame schedule of a master station; and issuing a frame schedule to the processor.
5. The method according to claim 4, wherein said step S2: the method for performing frame plan alignment sequentially performs the steps of: step S2.1: the superframe counter circularly counts according to the superframe period; step S2.2: when the demodulator captures the burst frame head, the time stamp adding subunit records the moment of the current burst in the super frame and simultaneously transmits the recorded value to the time stamp recording subunit; step S2.3: at the end of each superframe period, the superframe counter informs the processor in the form of an interrupt; step S2.4: the processor acquires burst time points recorded by the time stamp adding subunit at fixed time according to the received superframe interrupt signal; step S2.5: the processor compares the obtained burst time information with the time information of the frame plan to calculate the deviation time of the super-frame counter; step S2.6: the processor issues the deviation time to the superframe counter; step S2.7: the superframe counter corrects the value of the counter according to the deviation time; step S2.8: steps S2.2 to S2.7 are looped until the superframe counter is completely aligned with the frame schedule time information.
6. The method according to claim 5, wherein said step S3: the method for performing user interference sequentially performs the following steps: step S3.1: the signal processing device transmits an offline frame schedule to the processor; step S3.2: the processor issues the received frame schedule to the decoding guiding unit and completes frame schedule alignment; step S3.3: calculating the space transmission time delay according to GPS information and orbit position information of the satellite; step S3.4: recording the power and length information of a certain user burst according to the time captured by the superframe counter and the frame synchronization module; step S3.5: calculating a time slot starting point according to the value of the superframe counter and the air transmission delay; step S3.6: calculating an interference starting point according to the frame schedule, the time slot starting point and the burst power information of a certain user recorded by the time stamp recording module; step S3.7: and the processor transmits interference data according to the interference instruction, the interference moment point and the transmitting power and the length corresponding to the interference moment point which are issued by the upper computer.
7. An apparatus based on the satellite communication countermeasure based user interference method of one of claims 3 to 6, characterized in that the apparatus is a non-transitory computer readable storage medium storing computing instructions comprising: code segments for frame plan extraction and issuing are carried out; code segments for performing frame plan alignment; code segments that do user interference.
8. The apparatus of claim 7, wherein the storage medium further has stored thereon code segments for preprocessing; all physical layer specifications of the MF-TDMA network that the code segment has obtained and the frame plan specifications it employs; all specifications of the demodulator can be realized in the non-boot mode; meanwhile, all specifications of the decoder are realized.
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| CN115801111B (en) * | 2023-02-10 | 2023-04-25 | 成都戎星科技有限公司 | Method for realizing MF-TDMA signal user time slot data separation |
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