CN111614360A - Carrier interference device based on satellite communication countermeasure system and corresponding decoding method - Google Patents
Carrier interference device based on satellite communication countermeasure system and corresponding decoding method Download PDFInfo
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Abstract
The invention belongs to the technical field of satellite communication, and particularly relates to a carrier interference device based on a satellite communication countermeasure system and a corresponding decoding method. 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 system further comprises: a carrier jamming device; the carrier interference device is in signal connection with the processor and is used for carrying out carrier interference processing, and meanwhile, a decoder arranged in the device is used for carrying out decoding operation on the received signals; the target communication is interfered by carrier interference, and the method has the advantages of good concealment and high interference efficiency; meanwhile, when carrier interference is carried out, the target signal is decoded, so that information translation and decoding are possible, and the method has the advantages of high decoding efficiency and high accuracy.
Description
Technical Field
The invention belongs to the technical field of satellite communication, and particularly relates to a carrier interference device based on a satellite communication countermeasure system and a corresponding decoding method.
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.
Carrier communication (Carrier communication) is a telephone multiplex communication system based on frequency division multiplexing technology, and belongs to the standard of classical analog communication. In engineering, the frequency spectrum of an electric signal of one telephone is limited to be 300-3400 Hz; the frequency bandwidth occupied by a single telephone is 4 khz, taking into account the protective frequency separation. Therefore, it is possible to multiplex telephone signals of different numbers in the frequency bandwidth of one channel according to the different frequency bandwidths of the utility channels. For example, an overhead open-wire channel may typically multiplex 12 telephone signals, a symmetric cable channel may typically multiplex 60 telephone signals, a medium coaxial cable channel may multiplex thousands of telephone signals, and so on. In general, communication technologies are being digitalized at a large step, digital optical fiber communication, digital satellite communication, and digital microwave communication systems have an increasing weight, and analog carrier communication systems are shrinking. But carrier communication will continue to function in the branch lines and rural areas for a period of time.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a carrier jamming device and a corresponding decoding method based on a satellite communication countermeasure system, which interfere with target communication through carrier jamming and have the advantages of good concealment and high jamming efficiency; meanwhile, when carrier interference is carried out, the target signal is decoded, so that information translation and decoding are possible, and the method has the advantages of high decoding efficiency and high accuracy.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a carrier jamming device 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 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; characterized in that the system further comprises: a carrier jamming device; the carrier interference device is in signal connection with the processor and is used for carrying out carrier interference processing, and meanwhile, a decoder arranged in the device is used for carrying out decoding operation on the received signals; the method of decoding operation performs the steps of: the decoder acquires a preset bit index set, performs data modeling, establishes a decoding model, and decodes the received signal according to the established decoding model.
Further, the decoder performs data modeling, and the method for establishing the decoding model executes the following steps: acquiring a preset bit index set as an input variable by xiRepresenting, wherein i represents the ith variable in the data; said xiAt least comprises the following steps: the dimension of the bit index set, the length of the bit index set and the encoding complexity of the bit index set; setting a weight function of wiExpressing, performing convolution operation on each input variable and the corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:
setting the neuron threshold of the neural network as follows: theta; and operating the first intermediate result, the excitation function and the neuron threshold value to obtain a result of the forward neural network, wherein the result is as follows:
calculating a training error of the forward neural network; because the output variable E of the training is the 'predicted value of the encryption result', but a predicted value O is generated after the model training, the obtained error function is as follows:
wherein m represents the number of the input modeling samples at this time, and i represents the ith variable; the update weight w is propagated backwards; in order to reduce the error and improve the accuracy of model prediction, the neural network reversely transmits data from the output layer to the input layer, and the value of the weight w is readjusted until the model error reaches the minimum, and then the training is stopped, so that the model creation is completed.
Further, the method for decoding the received signal by the decoder according to the established decoding model comprises the following steps: the decoder performs polar code decoding on the received vector to be decoded to generate a third bit vector; the decoder performs polarization code encoding on the third bit vector to generate an encoded second code word, and extracts a bit corresponding to the serial number of the information bit index set from the encoded second code word as a decoded fourth information bit; or the decoder generates sub-matrixes according to the elements corresponding to the row index and the column index of the information bit index set in the first matrix respectively; performing linear transformation on the third bit vector by using the sub-matrix to generate a decoded fourth information bit; and performing error verification on the decoded fourth information bit by using the model, and if the error verification is within a set threshold range, taking the decoded fourth information bit as a final decoding result.
Further, the upper computer provides the transmission power and the length corresponding to the interference instruction, the interference time point and the interference time point for an operator to send to the processor; the processor controls the operation of the signal processing device and the carrier interference device according to an interference instruction sent by the upper computer, an interference time point and the transmitting power and length corresponding to the interference time point, so as to complete interference; the signal processing device, the step of processing the signal at least comprises: collecting signals; performing analog-to-digital conversion on the signal; acquiring a master station signaling specification and a frame schedule through signal analysis; issuing a frame schedule to a processor; completing frame plan alignment under the control of the processor; the step of the carrier interference device for carrying out carrier interference processing comprises the following steps: adding an interference signal to the carrier signal to obtain a carrier interference signal; the processor uses the carrier interference signal and receives the frame schedule from the signal processing device to complete the user interference.
Further, the carrier jamming device includes: the filtering and sampling unit is used for receiving signal demodulation filtering sampling, and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion of the received signals, so that two paths of orthogonal baseband signals are obtained; s1And SQ(ii) a Phase positionThe amplitude calculation unit calculates an initial phase and an amplitude by using the orthogonal signal, wherein the initial phase is as follows:
the initial amplitudes are:
the phase correction iteration unit is used for performing phase correction iteration operation on the obtained initial phase to obtain a target phase; and the interference signal generating unit generates an interference signal and modulates and superposes the interference signal on the received signal.
A decoding method for a carrier jamming device of a satellite communication based countermeasure system, the method comprising the steps of: the decoder acquires a preset bit index set, performs data modeling, establishes a decoding model, and decodes the received signal according to the established decoding model.
Further, the decoder performs data modeling, and the method for establishing the decoding model executes the following steps: acquiring a preset bit index set as an input variable by xiRepresenting, wherein i represents the ith variable in the data; said xiAt least comprises the following steps: the dimension of the bit index set, the length of the bit index set and the encoding complexity of the bit index set; setting a weight function of wiExpressing, performing convolution operation on each input variable and the corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:
setting the neuron threshold of the neural network as follows: theta; and operating the first intermediate result, the excitation function and the neuron threshold value to obtain a result of the forward neural network, wherein the result is as follows:
calculating a training error of the forward neural network; because the output variable E of the training is the 'predicted value of the encryption result', but a predicted value O is generated after the model training, the error is obtainedThe difference function is:
wherein m represents the number of the input modeling samples at this time, and i represents the ith variable; the update weight w is propagated backwards; in order to reduce the error and improve the accuracy of model prediction, the neural network reversely transmits data from the output layer to the input layer, and the value of the weight w is readjusted until the model error reaches the minimum, and then the training is stopped, so that the model creation is completed.
Further, the method for decoding the received signal by the decoder according to the established decoding model comprises the following steps: the decoder performs polar code decoding on the received vector to be decoded to generate a third bit vector; the decoder performs polarization code encoding on the third bit vector to generate an encoded second code word, and extracts a bit corresponding to the serial number of the information bit index set from the encoded second code word as a decoded fourth information bit; or the decoder generates sub-matrixes according to the elements corresponding to the row index and the column index of the information bit index set in the first matrix respectively; performing linear transformation on the third bit vector by using the sub-matrix to generate a decoded fourth information bit; and performing error verification on the decoded fourth information bit by using the model, and if the error verification is within a set threshold range, taking the decoded fourth information bit as a final decoding result.
Further, the upper computer provides the transmission power and the length corresponding to the interference instruction, the interference time point and the interference time point for an operator to send to the processor; the processor controls the operation of the signal processing device and the carrier interference device according to an interference instruction sent by the upper computer, an interference time point and the transmitting power and length corresponding to the interference time point, so as to complete interference; the signal processing device, the step of processing the signal at least comprises: collecting signals; performing analog-to-digital conversion on the signal; acquiring a master station signaling specification and a frame schedule through signal analysis; issuing a frame schedule to a processor; completing frame plan alignment under the control of the processor; the step of the carrier interference device for carrying out carrier interference processing comprises the following steps: adding an interference signal to the carrier signal to obtain a carrier interference signal; the processor uses the carrier interference signal and receives the frame schedule from the signal processing device to complete the user interference
Further, the carrier jamming device includes: the filtering and sampling unit is used for receiving signal demodulation filtering sampling, and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion of the received signals, so that two paths of orthogonal baseband signals are obtained; s1And SQ(ii) a The phase amplitude calculation unit calculates an initial phase and an amplitude by using the orthogonal signal, wherein the initial phase is as follows:
the initial amplitudes are:
the phase correction iteration unit is used for performing phase correction iteration operation on the obtained initial phase to obtain a target phase; and the interference signal generating unit generates an interference signal and modulates and superposes the interference signal on the received signal.
The carrier interference device based on the satellite communication countermeasure system and the corresponding decoding method have the following beneficial effects: the invention processes the interference signal to the carrier signal, and only interferes the load information behind the unique code aiming at the burst signal of each user, so that the target network can not receive correct data because of low signal-to-noise ratio. The method has the advantages of strong concealment and high interference efficiency. Meanwhile, the invention decodes the target signal when carrying out carrier interference. In the decoding process, a decoding model based on a neural network is used for decoding, so that the decoding efficiency is ensured, and the decoding accuracy is improved.
Drawings
Fig. 1 is a schematic structural diagram of a carrier jamming unit of a satellite-based communication countermeasure system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for decoding a carrier jamming unit of a satellite-based communication countermeasure system according to an embodiment of the present invention;
fig. 3 is a schematic view of the decoding efficiency of the corresponding decoding method of the carrier jamming unit of the satellite communication countermeasure system according to the present invention.
1-the experimental effect schematic diagram of the invention, and 2-the experimental effect schematic diagram of the prior art.
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 figure 1 of the drawings, in which,
a carrier jamming device 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 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; characterized in that the system further comprises: a carrier jamming device; the carrier interference device is in signal connection with the processor and is used for carrying out carrier interference processing, and meanwhile, a decoder arranged in the device is used for carrying out decoding operation on the received signals; the method of decoding operation performs the steps of: the decoder acquires a preset bit index set, performs data modeling, establishes a decoding model, and decodes the received signal according to the established decoding model.
Specifically, decoding is the inverse of encoding, while removing noise mixed into the bit stream during propagation. The process of translating a word into a set of numbers using a translation table or a series of signals representing a certain item of information into a word using a translation table is called decoding.
The decoder is a multi-input multi-output combinational logic circuit in electronic technology, and is responsible for translating binary codes into specific objects (such as logic levels and the like) with the function opposite to that of the encoder. Decoders are generally classified into general decoders and digital display decoders.
Example 2
On the basis of the above embodiment, the decoder performs data modeling, and the method for establishing the decoding model performs the following steps: obtaining a preset bit index setAs input variable, with xiRepresenting, wherein i represents the ith variable in the data; said xiAt least comprises the following steps: the dimension of the bit index set, the length of the bit index set and the encoding complexity of the bit index set; setting a weight function of wiExpressing, performing convolution operation on each input variable and the corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:
setting the neuron threshold of the neural network as follows: theta; and operating the first intermediate result, the excitation function and the neuron threshold value to obtain a result of the forward neural network, wherein the result is as follows:
calculating a training error of the forward neural network; because the output variable E of the training is the 'predicted value of the encryption result', but a predicted value O is generated after the model training, the obtained error function is as follows:
wherein m represents the number of the input modeling samples at this time, and i represents the ith variable; the update weight w is propagated backwards; in order to reduce the error and improve the accuracy of model prediction, the neural network reversely transmits data from the output layer to the input layer, and the value of the weight w is readjusted until the model error reaches the minimum, and then the training is stopped, so that the model creation is completed.
Specifically, the biological neural network mainly refers to a neural network of a human brain, which is a technical prototype of an artificial neural network. The human brain is the material basis for human thinking, whose function is localized in the cerebral cortex, which contains about 10^11 neurons, each of which is connected to about 103 other neurons through a neural synapse, forming a highly complex, highly flexible dynamic network. As a subject, the biological neural network mainly studies the structure, function and working mechanism of the human brain neural network, and aims to explore the law of human brain thinking and intelligent activities.
The artificial neural network is a technological recurrence of biological neural network under a certain simplification meaning, and as a subject, the artificial neural network is mainly used for building a practical artificial neural network model according to the principle of the biological neural network and the requirement of practical application, designing a corresponding learning algorithm, simulating certain intelligent activity of human brain, and then technically realizing the artificial neural network for solving the practical problem. Therefore, biological neural networks mainly study the mechanism of intelligence; the artificial neural network mainly researches the realization of an intelligent mechanism, and the two supplement each other.
Example 3
On the basis of the above embodiment, the method for decoding the received signal by the decoder according to the established decoding model performs the following steps: the decoder performs polar code decoding on the received vector to be decoded to generate a third bit vector; the decoder performs polarization code encoding on the third bit vector to generate an encoded second code word, and extracts a bit corresponding to the serial number of the information bit index set from the encoded second code word as a decoded fourth information bit; or the decoder generates sub-matrixes according to the elements corresponding to the row index and the column index of the information bit index set in the first matrix respectively; performing linear transformation on the third bit vector by using the sub-matrix to generate a decoded fourth information bit; and performing error verification on the decoded fourth information bit by using the model, and if the error verification is within a set threshold range, taking the decoded fourth information bit as a final decoding result.
Example 4
On the basis of the previous embodiment, the upper computer provides an operator with an interference instruction, an interference time point and the transmitting power and length corresponding to the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device according to an interference instruction sent by the upper computer, an interference time point and the transmitting power and length corresponding to the interference time point, so as to complete interference; the signal processing device, the step of processing the signal at least comprises: collecting signals; performing analog-to-digital conversion on the signal; acquiring a master station signaling specification and a frame schedule through signal analysis; issuing a frame schedule to a processor; completing frame plan alignment under the control of the processor; the step of the carrier interference device for carrying out carrier interference processing comprises the following steps: adding an interference signal to the carrier signal to obtain a carrier interference signal; the processor uses the carrier interference signal and receives the frame schedule from the signal processing device to complete the user interference.
In particular, 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 changes 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 same frequency interference means that the field intensity of a receiving point is the sum of the field intensities of signals from each base station in the coverage overlapping area of two or more adjacent base stations. The signals from the base stations arrive in the overlapping area at different times, i.e. there is a relative delay difference between the signals, thus generating a relative phase difference between the signals. Due to the existence of the phase difference, the signals in the overlapping area interfere with each other, so that the normal reception of the BP set is directly influenced. Of course, the co-channel interference has a certain relationship with the modulation degree and the frequency offset. The time of arrival of the signals transmitted by each base station in the overlapping area is adjusted in a certain mode, which is the key for solving the problem of co-channel interference. According to CCIR report, it can obtain satisfactory receiving effect for current POCSAG code of non-return-to-zero direct FSK modulation commonly used in wireless paging in China, when the relative time delay difference between the modulated signals of each base station is less than 1/4bit period. When the modulation signal rate is 1200bit/s, the relative delay difference should be less than 208 mus. The delay adjustment range of our common MOTOR0LA LT transmitter is 180-220 mus. Since the transmission medium from the splitter to each base is different, the delay of the transmitter is adjusted specifically, generally based on the base station farthest from the central station (delay 180 μ s), and the delay of other bases is calculated by 1 μ s per kilometer. In actual work, the required effect can be achieved by adjusting for many times.
Example 5
On the basis of the previous embodiment, the carrier jamming device includes: the filtering and sampling unit is used for receiving signal demodulation filtering sampling, and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion of the received signals, so that two paths of orthogonal baseband signals are obtained; s1And SQ(ii) a The phase amplitude calculation unit calculates an initial phase and an amplitude by using the orthogonal signal, wherein the initial phase is as follows:
the initial amplitudes are:
the phase correction iteration unit is used for performing phase correction iteration operation on the obtained initial phase to obtain a target phase; and the interference signal generating unit generates an interference signal and modulates and superposes the interference signal on the received signal.
Example 6
A decoding method for a carrier jamming device of a satellite communication based countermeasure system, the method comprising the steps of: the decoder acquires a preset bit index set, performs data modeling, establishes a decoding model, and decodes the received signal according to the established decoding model.
Example 7
On the basis of the above embodiment, the decoder performs data modeling, and the method for establishing the decoding model performs the following steps: acquiring a preset bit index set as an input variable by xiRepresenting, wherein i represents the ith variable in the data; said xiAt least comprises the following steps: the dimension of the bit index set, the length of the bit index set and the encoding complexity of the bit index set; setting a weight function of wiExpressing, performing convolution operation on each input variable and the corresponding weight function to obtain a first intermediate result; setting an excitation functionThe excitation function is as follows:
setting the neuron threshold of the neural network as follows: theta; and operating the first intermediate result, the excitation function and the neuron threshold value to obtain a result of the forward neural network, wherein the result is as follows:
calculating a training error of the forward neural network; because the output variable E of the training is the 'predicted value of the encryption result', but a predicted value O is generated after the model training, the obtained error function is as follows:
wherein m represents the number of the input modeling samples at this time, and i represents the ith variable; the update weight w is propagated backwards; in order to reduce the error and improve the accuracy of model prediction, the neural network reversely transmits data from the output layer to the input layer, and the value of the weight w is readjusted until the model error reaches the minimum, and then the training is stopped, so that the model creation is completed.
Example 8
On the basis of the above embodiment, the method for decoding the received signal by the decoder according to the established decoding model performs the following steps: the decoder performs polar code decoding on the received vector to be decoded to generate a third bit vector; the decoder performs polarization code encoding on the third bit vector to generate an encoded second code word, and extracts a bit corresponding to the serial number of the information bit index set from the encoded second code word as a decoded fourth information bit; or the decoder generates sub-matrixes according to the elements corresponding to the row index and the column index of the information bit index set in the first matrix respectively; performing linear transformation on the third bit vector by using the sub-matrix to generate a decoded fourth information bit; and performing error verification on the decoded fourth information bit by using the model, and if the error verification is within a set threshold range, taking the decoded fourth information bit as a final decoding result.
Example 9
On the basis of the previous embodiment, the upper computer provides an operator with an interference instruction, an interference time point and the transmitting power and length corresponding to the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device according to an interference instruction sent by the upper computer, an interference time point and the transmitting power and length corresponding to the interference time point, so as to complete interference; the signal processing device, the step of processing the signal at least comprises: collecting signals; performing analog-to-digital conversion on the signal; acquiring a master station signaling specification and a frame schedule through signal analysis; issuing a frame schedule to a processor; completing frame plan alignment under the control of the processor; the step of the carrier interference device for carrying out carrier interference processing comprises the following steps: adding an interference signal to the carrier signal to obtain a carrier interference signal; the processor uses the carrier interference signal and receives the frame schedule from the signal processing device to complete the user interference.
Specifically, in view of the composition architecture of the MF-TDMA network carrier, the satellite interference system is divided into: carrier interference and full network interference. The network wide disturbance can in fact also be referred to as network wide suppression, i.e.: paralyzing the whole satellite communication network of the other party. The whole network interference method is simple, the interference to the whole MF-TDMA network can be realized only by interfering the carrier wave sent by the master station, the whole network interference does not need to be considered and is not suspected by the other party, and once the whole network is interfered, the interference from a third party is bound. The carrier interference method is relatively difficult because the user does not suspect that the communication device is interfered during carrier interference.
In a carrier interference system, a set of small stations which are the same as an opposite network need to be designed, and because the demodulator which is the same as the opposite network exists, the power which needs to be sent can be calculated so as to achieve the purpose of carrier interference at a time point. Since the satellite network we are about to monitor is not designed by us. Therefore, it is usually necessary to extract the signal feature 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.
However, the carrier interference system, like the whole network interference system, is also easy to cause 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 certain user in the MF-TDMA system, and does not allow the target to suspect that its network is interfered. Therefore, by means of carrier interference, only the burst signal of each user interferes only the load information behind the unique code, so that the target network can not receive correct data because of low signal-to-noise ratio (possibly cloud blocking, rainstorm or other reasons).
Example 10
On the basis of the previous embodiment, the carrier jamming device includes: the filtering and sampling unit is used for receiving signal demodulation filtering sampling, and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion of the received signals, so that two paths of orthogonal baseband signals are obtained; s1And SQ(ii) a The phase amplitude calculation unit calculates an initial phase and an amplitude by using the orthogonal signal, wherein the initial phase is as follows:
the initial amplitudes are:
the phase correction iteration unit is used for performing phase correction iteration operation on the obtained initial phase to obtain a target phase; and the interference signal generating unit generates an interference signal and modulates and superposes the interference signal on the received signal.
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 (10)
1. A carrier jamming device 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 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; characterized in that the system further comprises: a carrier jamming device; the carrier interference device is in signal connection with the processor and is used for carrying out carrier interference processing, and meanwhile, a decoder arranged in the device is used for carrying out decoding operation on the received signals; the method of decoding operation performs the steps of: the decoder acquires a preset bit index set, performs data modeling, establishes a decoding model, and decodes the received signal according to the established decoding model.
2. The apparatus of claim 1, wherein the decoder performs data modeling, and wherein the method of modeling the decoder performs the steps of: acquiring a preset bit index set as an input variable by xiRepresenting, wherein i represents the ith variable in the data; said xiAt least comprises the following steps: the dimension of the bit index set, the length of the bit index set and the encoding complexity of the bit index set; setting a weight function of wiExpressing, by running each input variable with a corresponding weight functionPerforming convolution operation to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:
setting the neuron threshold of the neural network as follows: theta; and operating the first intermediate result, the excitation function and the neuron threshold value to obtain a result of the forward neural network, wherein the result is as follows:
calculating a training error of the forward neural network; because the output variable E of the training is the 'predicted value of the encryption result', but a predicted value O is generated after the model training, the obtained error function is as follows:
wherein m represents the number of the input modeling samples at this time, and i represents the ith variable; the update weight w is propagated backwards; in order to reduce the error and improve the accuracy of model prediction, the neural network reversely transmits data from the output layer to the input layer, and the value of the weight w is readjusted until the model error reaches the minimum, and then the training is stopped, so that the model creation is completed.
3. The apparatus of claim 2, wherein said decoder decodes the received signal according to the established decoding model by performing the steps of: the decoder performs polar code decoding on the received vector to be decoded to generate a third bit vector; the decoder performs polarization code encoding on the third bit vector to generate an encoded second code word, and extracts a bit corresponding to the serial number of the information bit index set from the encoded second code word as a decoded fourth information bit; or the decoder generates sub-matrixes according to the elements corresponding to the row index and the column index of the information bit index set in the first matrix respectively; performing linear transformation on the third bit vector by using the sub-matrix to generate a decoded fourth information bit; and performing error verification on the decoded fourth information bit by using the model, and if the error verification is within a set threshold range, taking the decoded fourth information bit as a final decoding result.
4. The device of claim 3, wherein the upper computer provides the operator with an interference command, an interference time point, and a transmission power and a length corresponding to the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device according to an interference instruction sent by the upper computer, an interference time point and the transmitting power and length corresponding to the interference time point, so as to complete interference; the signal processing device, the step of processing the signal at least comprises: collecting signals; performing analog-to-digital conversion on the signal; acquiring a master station signaling specification and a frame schedule through signal analysis; issuing a frame schedule to a processor; completing frame plan alignment under the control of the processor; the step of the carrier interference device for carrying out carrier interference processing comprises the following steps: adding an interference signal to the carrier signal to obtain a carrier interference signal; the processor uses the carrier interference signal and receives the frame schedule from the signal processing device to complete the user interference.
5. The apparatus of claim 4, wherein the carrier jamming means comprises: the filtering and sampling unit is used for receiving signal demodulation filtering sampling, and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion of the received signals, so that two paths of orthogonal baseband signals are obtained; s1And SQ(ii) a The phase amplitude calculation unit calculates an initial phase and an amplitude by using the orthogonal signal, wherein the initial phase is as follows:
the initial amplitudes are:
the phase correction iteration unit is used for performing phase correction iteration operation on the obtained initial phase to obtain a target phase; and the interference signal generating unit generates an interference signal and modulates and superposes the interference signal on the received signal.
6. Method for decoding a satellite-based communication countermeasure system carrier jamming device based on the system according to one of claims 1 to 5, characterized in that the method performs the following steps: the decoder acquires a preset bit index set, performs data modeling, establishes a decoding model, and decodes the received signal according to the established decoding model.
7. The method of claim 6, wherein the decoder performs data modeling, the method of modeling the decoder performing the steps of: acquiring a preset bit index set as an input variable by xiRepresenting, wherein i represents the ith variable in the data; said xiAt least comprises the following steps: the dimension of the bit index set, the length of the bit index set and the encoding complexity of the bit index set; setting a weight function of wiExpressing, performing convolution operation on each input variable and the corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:
setting the neuron threshold of the neural network as follows: theta; and operating the first intermediate result, the excitation function and the neuron threshold value to obtain a result of the forward neural network, wherein the result is as follows:
calculating a training error of the forward neural network; because the output variable E of the training is the 'predicted value of the encryption result', but a predicted value O is generated after the model training,so the error function is derived as:
wherein m represents the number of the input modeling samples at this time, and i represents the ith variable; the update weight w is propagated backwards; in order to reduce the error and improve the accuracy of model prediction, the neural network reversely transmits data from the output layer to the input layer, and the value of the weight w is readjusted until the model error reaches the minimum, and then the training is stopped, so that the model creation is completed.
8. The method of claim 7, wherein the decoder decodes the received signal according to the established decoding model by performing the steps of: the decoder performs polar code decoding on the received vector to be decoded to generate a third bit vector; the decoder performs polarization code encoding on the third bit vector to generate an encoded second code word, and extracts a bit corresponding to the serial number of the information bit index set from the encoded second code word as a decoded fourth information bit; or the decoder generates sub-matrixes according to the elements corresponding to the row index and the column index of the information bit index set in the first matrix respectively; performing linear transformation on the third bit vector by using the sub-matrix to generate a decoded fourth information bit; and performing error verification on the decoded fourth information bit by using the model, and if the error verification is within a set threshold range, taking the decoded fourth information bit as a final decoding result.
9. The method of claim 8, wherein the upper computer provides the operator with the transmission power and length corresponding to the interference command, the interference time point and the interference time point; the processor controls the operation of the signal processing device and the carrier interference device according to an interference instruction sent by the upper computer, an interference time point and the transmitting power and length corresponding to the interference time point, so as to complete interference; the signal processing device, the step of processing the signal at least comprises: collecting signals; performing analog-to-digital conversion on the signal; acquiring a master station signaling specification and a frame schedule through signal analysis; issuing a frame schedule to a processor; completing frame plan alignment under the control of the processor; the step of the carrier interference device for carrying out carrier interference processing comprises the following steps: adding an interference signal to the carrier signal to obtain a carrier interference signal; the processor uses the carrier interference signal and receives the frame schedule from the signal processing device to complete the user interference.
10. The method of claim 9, wherein the carrier jamming device comprises: the filtering and sampling unit is used for receiving signal demodulation filtering sampling, and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion of the received signals, so that two paths of orthogonal baseband signals are obtained; s1And SQ(ii) a The phase amplitude calculation unit calculates an initial phase and an amplitude by using the orthogonal signal, wherein the initial phase is as follows:
the initial amplitudes are:
the phase correction iteration unit is used for performing phase correction iteration operation on the obtained initial phase to obtain a target phase; and the interference signal generating unit generates an interference signal and modulates and superposes the interference signal on the received signal.
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