CN111614360B - 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 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 system further comprises: a carrier interference 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 built in the device is used for decoding the received signals; the method has the advantages of good concealment and high interference efficiency by interfering the target communication through carrier interference; meanwhile, when carrier interference is carried out, the target signal is decoded, so that translation and information cracking 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 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.
The carrier communication (Carrier communication) is a telephone multipath communication system based on the frequency division multiplexing technology, and belongs to the standard of classical analog communication. In engineering, the electric signal spectrum of one telephone is limited to the range of 300-3400 Hz; with the protective frequency spacing in mind, one telephone would occupy a frequency bandwidth of 4 khz. Therefore, according to the different frequency bandwidths of the practical channels, telephone signals with different paths can be multiplexed in the frequency bandwidth of one channel. For example, overhead open wire channels typically can multiplex 12 telephone signals, symmetrical cable channels typically can multiplex 60 telephone signals, medium coaxial cable channels can multiplex thousands of telephone signals, and so on. In general, the communication technology is moving to digitization, digital optical fiber communication, digital satellite communication and digital microwave communication systems are increasingly more and more specific, and analog carrier communication systems are increasingly shrinking. But for some time carrier communication continues to function in both branch and rural areas.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a carrier interference device and a corresponding decoding method based on a satellite communication countermeasure system, which can interfere with a target communication by carrier interference, and has the advantages of good concealment and high interference efficiency; meanwhile, when carrier interference is carried out, the target signal is decoded, so that translation and information cracking are possible, and the method has the advantages of high decoding efficiency and high accuracy.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a carrier-to-interference device based on a satellite communication countermeasure 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; characterized in that the system further comprises: a carrier interference 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 built in the device is used for decoding the received signals; the method of the 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 building the decoding model performs the following steps: acquiring a preset bit index set as an input variable by using x i Representation ofWherein i represents the ith variable in the data; the x is i At least comprises: dimension of the bit index set, length of the bit index set and coding complexity of the bit index set; setting a weight function by w i The method comprises the steps of representing, carrying out convolution operation on each input variable and a corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:the neuron threshold of the neural network is set as follows: Θ; and calculating the first intermediate result and the excitation function and the neuron threshold value to obtain the result of the forward neural network, wherein the result is as follows: />Calculating a training error of the forward neural network; since the output variable E of the present training is the "encryption result predicted value", but a predicted value O is generated after model training, the error function is obtained as follows:wherein m represents the number of modeling samples input this time, and i represents the ith variable; back-propagating the update weights w; in order to make the error smaller and improve the accuracy of model prediction, the neural network can reversely transmit data from the output layer to the input layer, readjust the value of the weight w, stop training until the model error reaches the minimum, and complete the model creation.
Further, the decoder performs the following steps according to the method of decoding the received signal according to the built decoding model: the decoder performs polarization 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 codeword, and extracts bits corresponding to the sequence numbers of the information bit index set from the encoded second codeword to serve as decoded fourth information bits; or the decoder generates a sub-matrix according to the corresponding elements of the row index and the column index of the information bit index set in the first matrix; performing linear transformation on the third bit vector by using the submatrix to generate decoded fourth information bits; and performing error verification on the decoded fourth information bit by using the model, and taking the decoded fourth information bit as a final decoding result if the error verification is within a set threshold range.
Further, the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference time point and the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device 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 to finish interference; 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; 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 interference device includes: the filtering sampling unit is used for demodulating, filtering and sampling the received signal and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion on the received signal, so that two paths of quadrature baseband signals are obtained; s is S 1 S and S Q The method comprises the steps of carrying out a first treatment on the surface of the The phase and amplitude calculation unit calculates an initial phase and an amplitude by using the quadrature signal, wherein the initial phase is as follows:the initial amplitude is: />The phase correction iteration unit is used for carrying out phase correction iteration operation on the obtained initial phase to obtain a target phase; an interference signal generating unit for generating and modulating an interference signalAnd superimposed on the received signal.
A method for decoding a carrier-to-interference device based on a satellite communication countermeasure system, the method comprising: 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 building the decoding model performs the following steps: acquiring a preset bit index set as an input variable by using x i A representation, wherein i represents the ith variable in the data; the x is i At least comprises: dimension of the bit index set, length of the bit index set and coding complexity of the bit index set; setting a weight function by w i The method comprises the steps of representing, carrying out convolution operation on each input variable and a corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:the neuron threshold of the neural network is set as follows: Θ; and calculating the first intermediate result and the excitation function and the neuron threshold value to obtain the result of the forward neural network, wherein the result is as follows: />Calculating a training error of the forward neural network; since the output variable E of the present training is the "encryption result predicted value", but a predicted value O is generated after model training, the error function is obtained as follows:wherein m represents the number of modeling samples input this time, and i represents the ith variable; back-propagating the update weights w; in order to make the error smaller and improve the accuracy of model prediction, the neural network can reversely transmit data from the output layer to the input layer, readjust the value of the weight w, stop training until the model error reaches the minimum, and complete the model creation.
Further, the decoder performs the following steps according to the method of decoding the received signal according to the built decoding model: the decoder performs polarization 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 codeword, and extracts bits corresponding to the sequence numbers of the information bit index set from the encoded second codeword to serve as decoded fourth information bits; or the decoder generates a sub-matrix according to the corresponding elements of the row index and the column index of the information bit index set in the first matrix; performing linear transformation on the third bit vector by using the submatrix to generate decoded fourth information bits; and performing error verification on the decoded fourth information bit by using the model, and taking the decoded fourth information bit as a final decoding result if the error verification is within a set threshold range.
Further, the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference time point and the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device 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 to finish interference; 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; 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 interference device includes: the filtering sampling unit is used for demodulating, filtering and sampling the received signal and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion on the received signal, so that two paths of quadrature baseband signals are obtained; s is S 1 S and S Q The method comprises the steps of carrying out a first treatment on the surface of the Phase amplitude calculationA unit for calculating an initial phase and an amplitude by using the quadrature signal, wherein the initial phase is:the initial amplitude is: />The phase correction iteration unit is used for carrying out phase correction iteration operation on the obtained initial phase to obtain a target phase; an interference signal generating unit generates an interference signal and modulates and superimposes 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 after the unique code aiming at the burst signal of each user, so that the target network cannot 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 neural network-based decoding model is used for decoding, so that the decoding efficiency is ensured, and meanwhile, the decoding accuracy is improved.
Drawings
Fig. 1 is a schematic device structure diagram of a carrier interference device based on a satellite communication countermeasure system according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for decoding a carrier interference device based on a satellite communication countermeasure system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of decoding efficiency of a corresponding decoding method of a carrier-to-interference device based on a satellite communication countermeasure system according to the present invention.
1-schematic experimental effect of the invention, 2-schematic experimental effect of the prior art.
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 figure 1 of the drawings,
a carrier-to-interference device based on a satellite communication countermeasure 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; characterized in that the system further comprises: a carrier interference 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 built in the device is used for decoding the received signals; the method of the 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.
In particular, decoding is the inverse of encoding while removing noise that is mixed in the bit stream during propagation. The process of translating a word into a set of numbers using a code table or translating a series of signals representing an item of information into a word using a code table is called decoding.
A decoder is a multiple-input multiple-output combinational logic circuit in electronic technology, which is responsible for translating binary codes into specific objects (such as logic levels, etc.), and functions opposite to an encoder. Decoders are generally divided into two general categories, namely, universal decoders and digital display decoders.
Example 2
On the basis of the above embodiment, the method for establishing a decoding model by performing data modeling by the decoder performs the following steps: acquiring a preset bit index set as an input variable by using x i A representation, wherein i represents the ith variable in the data; the x is i At least comprises: dimension of the bit index set, length of the bit index set and coding complexity of the bit index set; setting a weight function by w i The method comprises the steps of representing, carrying out convolution operation on each input variable and a corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:the neuron threshold of the neural network is set as follows: Θ; and calculating the first intermediate result and the excitation function and the neuron threshold value to obtain the result of the forward neural network, wherein the result is as follows: />Calculating a training error of the forward neural network; since the output variable E of the present training is the "encryption result predicted value", but a predicted value O is generated after model training, the error function is obtained as follows: />Wherein m represents the number of modeling samples input this time, and i represents the ith variable; back-propagating the update weights w; in order to make the error smaller and improve the accuracy of model prediction, the neural network can reversely transmit data from the output layer to the input layer, readjust the value of the weight w, stop training until the model error reaches the minimum, and complete the model creation.
Specifically, the biological neural network mainly refers to a neural network of the human brain, and is a technical prototype of an artificial neural network. The human brain is the material basis of human thinking, whose function is localized to the cerebral cortex, which contains about 10≡11 neurons, each of which is in turn connected to about 103 other neurons by synapses, forming a highly complex and highly flexible dynamic network. As a discipline, biological neural networks mainly study the structure, function and working mechanism of human brain neural networks, and are intended to explore the laws of human brain thinking and intelligent activities.
The artificial neural network is a technical reproduction of the biological neural network in a certain simplified sense, and is mainly used for constructing a practical artificial neural network model according to the principle of the biological neural network and the actual application requirement, designing a corresponding learning algorithm, simulating certain intelligent activities of the human brain and then realizing the artificial neural network in the technical way so as to solve the actual problem. Therefore, biological neural networks mainly study the mechanisms of intelligence; the artificial neural network mainly researches the realization of an intelligent mechanism, and the two complement 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 polarization 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 codeword, and extracts bits corresponding to the sequence numbers of the information bit index set from the encoded second codeword to serve as decoded fourth information bits; or the decoder generates a sub-matrix according to the corresponding elements of the row index and the column index of the information bit index set in the first matrix; performing linear transformation on the third bit vector by using the submatrix to generate decoded fourth information bits; and performing error verification on the decoded fourth information bit by using the model, and taking the decoded fourth information bit as a final decoding result if the error verification is within a set threshold range.
Example 4
On the basis of the previous embodiment, the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference time point and the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device 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 to finish interference; 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; 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, 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 co-channel interference is that in the coverage overlapping area of two or several adjacent base stations, the field intensity of the receiving point is the sum of the signal field intensity from each base station. The time for signals from each base station to reach the overlap area is also different, i.e., there is a relative delay difference between the signals, thereby producing a relative phase difference for each signal. Because of the phase difference, the signals in the overlapping area interfere with each other, so that the normal receiving of the BP set is directly affected. Of course, the co-channel interference also has a certain relation with the modulation degree and the frequency offset. The time for the signals sent by each base station to reach the overlapping area is adjusted in a certain way, which is the key for solving the same-frequency interference problem. According to the report of CCIR, when the relative delay difference between the modulation signals of all base stations is less than 1/4bit period, the overlapping zone BP machine can obtain satisfactory receiving effect. When the modulation signal rate is 1200 bits/s, the relative delay difference should be less than 208 mus. The delay adjustment range of the common MOTOR0LA LT transmitter is 180-220 mu s. Because the transmission medium from the splitter to each base station is different, when the time delay of the transmitter is specifically adjusted, the time delay of other base stations is generally calculated by taking the base station farthest from the central station as a reference (the time delay is 180 mu s) and 1 mu s of time delay per kilometer. In actual operation, the required effect can be achieved only by multiple times of adjustment.
Example 5
On the basis of the above embodiment, the carrier interference device includes: the filtering sampling unit is used for demodulating, filtering and sampling the received signal and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion on the received signal, so that two paths of quadrature baseband signals are obtained; s is S 1 S and S Q The method comprises the steps of carrying out a first treatment on the surface of the Phase (C)The bit amplitude calculating unit calculates initial phase and amplitude by using the quadrature signal, wherein the initial phase is as follows:the initial amplitude is: />The phase correction iteration unit is used for carrying out phase correction iteration operation on the obtained initial phase to obtain a target phase; an interference signal generating unit generates an interference signal and modulates and superimposes the interference signal on the received signal.
Example 6
A method for decoding a carrier-to-interference device based on a satellite communication countermeasure system, the method comprising: 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 method for establishing a decoding model by performing data modeling by the decoder performs the following steps: acquiring a preset bit index set as an input variable by using x i A representation, wherein i represents the ith variable in the data; the x is i At least comprises: dimension of the bit index set, length of the bit index set and coding complexity of the bit index set; setting a weight function by w i The method comprises the steps of representing, carrying out convolution operation on each input variable and a corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:the neuron threshold of the neural network is set as follows: Θ; and calculating the first intermediate result and the excitation function and the neuron threshold value to obtain the result of the forward neural network, wherein the result is as follows: />Calculating a training error of the forward neural network; from the following componentsThe output variable E of the training is the "encryption result predicted value", but after model training, a predicted value O is generated, so that an error function is obtained as follows: />Wherein m represents the number of modeling samples input this time, and i represents the ith variable; back-propagating the update weights w; in order to make the error smaller and improve the accuracy of model prediction, the neural network can reversely transmit data from the output layer to the input layer, readjust the value of the weight w, stop training until the model error reaches the minimum, and complete the model creation.
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 polarization 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 codeword, and extracts bits corresponding to the sequence numbers of the information bit index set from the encoded second codeword to serve as decoded fourth information bits; or the decoder generates a sub-matrix according to the corresponding elements of the row index and the column index of the information bit index set in the first matrix; performing linear transformation on the third bit vector by using the submatrix to generate decoded fourth information bits; and performing error verification on the decoded fourth information bit by using the model, and taking the decoded fourth information bit as a final decoding result if the error verification is within a set threshold range.
Example 9
On the basis of the previous embodiment, the upper computer provides the operator with transmitting power and length corresponding to the interference instruction, the interference time point and the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device 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 to finish interference; 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; 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 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 10
On the basis of the above embodiment, the carrier interference device includes: the filtering sampling unit is used for demodulating, filtering and sampling the received signal and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion on the received signal, so that two paths of quadrature baseband signals are obtained; s is S 1 S and S Q The method comprises the steps of carrying out a first treatment on the surface of the The phase and amplitude calculation unit calculates an initial phase and an amplitude by using the quadrature signal, wherein the initial phase is as follows:the initial amplitude is: />The phase correction iteration unit is used for carrying out phase correction iteration operation on the obtained initial phase to obtain a target phase; an interference signal generating unit generates an interference signal and modulates and superimposes the interference signal on the received signal.
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 (10)
1. A carrier-to-interference device based on a satellite communication countermeasure 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; characterized in that the system further comprises: a carrier interference device; the carrier interference device is in signal connection with the processor, carries out carrier interference processing, only interferes with load information after the unique code aiming at burst signals of each user, and simultaneously uses a decoder built in the device to decode the received signals; the method of the 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 the method of modeling the decoding performs the steps of: acquiring a preset bit index set as an input variable by using x i A representation, wherein i represents the ith variable in the data; the x is i At least comprises: dimension of the bit index set, length of the bit index set and coding complexity of the bit index set; setting a weight function by w i The method comprises the steps of representing, carrying out convolution operation on each input variable and a corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:the neuron threshold of the neural network is set as follows: Θ; and calculating the first intermediate result and the excitation function and the neuron threshold value to obtain the result of the forward neural network, wherein the result is as follows: />Calculating a training error of the forward neural network; since the output variable E of the present training is the "encryption result predicted value", but a predicted value O is generated after model training, the error function is obtained as follows: />Wherein m represents the number of modeling samples input this time, and i represents the ith variable; back-propagating the update weights w; in order to make the error smaller and improve the accuracy of model prediction, the neural network can reversely transmit data from the output layer to the input layer, readjust the value of the weight w, stop training until the model error reaches the minimum, and complete the model creation.
3. The apparatus of claim 2, wherein the decoder performs the following steps for decoding the received signal according to the established decoding model: the decoder performs polarization 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 codeword, and extracts bits corresponding to the sequence numbers of the information bit index sets from the encoded second codeword to serve as decoded fourth information bits; or the decoder generates a sub-matrix according to the corresponding elements of the row index and the column index of the information bit index set in the first matrix; performing linear transformation on the third bit vector by using the submatrix to generate decoded fourth information bits; and performing error verification on the decoded fourth information bit by using the model, and taking the decoded fourth information bit as a final decoding result if the error verification is within a set threshold range.
4. The apparatus of claim 3, wherein the upper computer provides the operator with the transmit power and length corresponding to the interference command, the interference time point, and the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device 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 to finish interference; 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; 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-to-interference means comprises: the filtering sampling unit is used for demodulating, filtering and sampling the received signal and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion on the received signal, so that two paths of quadrature baseband signals are obtained; s is S 1 S and S Q The method comprises the steps of carrying out a first treatment on the surface of the The phase and amplitude calculation unit calculates an initial phase and an amplitude by using the quadrature signal, wherein the initial phase is as follows:the initial amplitude is: />The phase correction iteration unit is used for carrying out phase correction iteration operation on the obtained initial phase to obtain a target phase; an interference signal generating unit generates an interference signal and modulates and superimposes the interference signal on the received signal.
6. Method for decoding a carrier-to-interference device based on a satellite communication countermeasure 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 and the method of building a decoding model performs the steps of: acquiring a preset bit index set as an input variable by using x i A representation, wherein i represents the ith variable in the data; the x is i At least comprises: dimension of the bit index set, length of the bit index set and coding complexity of the bit index set; setting a weight function by w i The method comprises the steps of representing, carrying out convolution operation on each input variable and a corresponding weight function to obtain a first intermediate result; setting an excitation function, wherein the excitation function is as follows:the neuron threshold of the neural network is set as follows: Θ; and calculating the first intermediate result and the excitation function and the neuron threshold value to obtain the result of the forward neural network, wherein the result is as follows: />Calculating a training error of the forward neural network; since the output variable E of the present training is the "encryption result predicted value", but a predicted value O is generated after model training, the error function is obtained as follows: />Wherein m represents the number of modeling samples input this time, and i represents the ith variable; back-propagating the update weights w; in order to make the error smaller and improve the accuracy of model prediction, the neural network can reversely transmit data from the output layer to the input layer, readjust the value of the weight w, stop training until the model error reaches the minimum, and complete the model creation.
8. The method of claim 7, wherein the decoder performs the following steps for decoding the received signal according to the established decoding model: the decoder performs polarization 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 codeword, and extracts bits corresponding to the sequence numbers of the information bit index sets from the encoded second codeword to serve as decoded fourth information bits; or the decoder generates a sub-matrix according to the corresponding elements of the row index and the column index of the information bit index set in the first matrix; performing linear transformation on the third bit vector by using the submatrix to generate decoded fourth information bits; and performing error verification on the decoded fourth information bit by using the model, and taking the decoded fourth information bit as a final decoding result if the error verification is within a set threshold range.
9. The method of claim 8, wherein the host computer provides the operator with the transmit power and length corresponding to the interference command, the interference time point, and the interference time point to the processor; the processor controls the operation of the signal processing device and the carrier interference device 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 to finish interference; 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; 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-to-interference means comprises: the filtering sampling unit is used for demodulating, filtering and sampling the received signal and comprises the processes of pre-amplifying, quadrature demodulation, low-pass filtering and analog-to-digital conversion on the received signal, so that two paths of quadrature baseband signals are obtained; s is S 1 S and S Q The method comprises the steps of carrying out a first treatment on the surface of the The phase and amplitude calculation unit calculates an initial phase and an amplitude by using the quadrature signal, wherein the initial phase is as follows:the initial amplitude is: />The phase correction iteration unit is used for carrying out phase correction iteration operation on the obtained initial phase to obtain a target phase; an interference signal generating unit generates an interference signal and modulates and superimposes the interference signal on the received signal.
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