CN115567095A - Space-time joint anti-interference method, equipment and medium suitable for satellite communication - Google Patents
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Abstract
The invention discloses a space-time joint anti-interference method, equipment and medium suitable for satellite communication, belonging to the field of signal processing and communication and comprising the following steps: the transmitting terminal detects the transmitting state and the signal power of the transmitted communication signal, then generates a pilot signal and controls a modulation switch of the pilot signal, and controls and adjusts the power of the pilot signal, wherein the power of the pilot signal is lower than that of the communication signal; then the guide signal and the communication signal are combined and sent out through a transmitting antenna; the receiving end carries out preprocessing on communication signals and guide signals received by the array antenna, then carries out anti-interference processing on the guide signals, completes demodulation and reconstruction of the guide signals, and then calculates array guide vectors of the communication signals by using the reconstructed guide signals; then, the anti-interference processing is carried out on the communication signals, and finally, the anti-interference output radio frequency receiving communication signals are generated through the signal up-conversion processing. The invention improves the anti-interference capability of the small-distance array antenna in a complex electromagnetic environment.
Description
Technical Field
The present invention relates to the field of signal processing and communication, and more particularly, to a space-time joint anti-interference method, device, and medium suitable for satellite communication.
Background
With the maturity and practical deployment of the electromagnetic spectrum warfare theory, electromagnetic interference equipment is changing day by day, and the influence of the derived complex electromagnetic environment on the working efficiency of the satellite communication system is increasing day by day. At present, the technical means adopted for resisting electromagnetic interference are focused on: power domain-using adaptive power control techniques, frequency domain-using frequency hopping techniques, time domain-using time hopping or burst communication techniques, and information domain-using high-efficiency high-gain coding techniques. However, with the increasing radiation power of the electromagnetic interference device and the mature application of the following frequency hopping interference technology, the performance of the above-mentioned conventional anti-interference means in the electromagnetic spectrum battle environment will be greatly restricted.
The spatial filtering algorithm based on the array antenna is outstanding in anti-interference capability, and extremely considerable efficiency is obtained in the field of satellite communication and navigation. For satellite communication signals of a low frequency band, the traditional half-wavelength distance array antenna is difficult to be deployed on a miniaturized platform; and the small-spacing array antenna (the array element spacing is smaller than half wavelength) has extremely strong coupling characteristic and the array response changes along with the environmental sensitivity, so that the spatial filtering anti-interference algorithm of the array response parameters calibrated by using the traditional darkroom fails.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a space-time joint anti-interference method, equipment and medium suitable for satellite communication, and improves the anti-interference capability of a small-spacing array antenna in a complex electromagnetic environment.
The purpose of the invention is realized by the following scheme:
a space-time joint anti-interference method suitable for satellite communication comprises the following steps:
the processing flow of the transmitting end transmitting signal is as follows: detecting the transmitting state and the signal power of a transmitted communication signal, then generating a pilot signal, controlling a modulation switch of the pilot signal by using the detected transmitting state of the transmitted communication signal, and controlling and adjusting the power of the pilot signal by using the detected signal power of the transmitted communication signal, wherein the power of the pilot signal is lower than that of the communication signal; then combining the guide signal and the communication signal and transmitting the combined signal through a transmitting antenna;
the receiving end receives the signal processing flow: preprocessing a communication signal and a guide signal received by an array antenna, then performing anti-interference processing on the guide signal, completing demodulation and reconstruction of the guide signal, and then calculating an array guide vector of the communication signal by using the reconstructed guide signal; then, the anti-interference processing is carried out on the communication signals, and finally, the anti-interference output radio frequency receiving communication signals are generated through the signal up-conversion processing.
Further, in the processing flow of the transmitting end transmitting signal, the pilot signal is aligned with the transmitting time slot of the communication signal, and the transmitting state and the power of the pilot signal are dynamically adjusted.
Further, the pilot signal is a parasitic signal hidden under the communication signal, and includes a direct sequence spread spectrum signal with low power spectral density as the pilot signal.
Further, the calculating the array steering vector of the communication signal by using the reconstructed steering signal specifically includes calculating the array steering vector of the communication signal by using the reconstructed steering signal as a reference signal according to a correlation between the reference signal and an array receiving signal, and implementing real-time calibration of a response parameter of the communication signal array.
Further, the anti-interference processing on the pilot signal includes adopting space-time joint adaptive anti-interference processing based on a power inversion criterion to realize anti-interference reception of the pilot signal.
Further, the anti-interference processing on the communication signal includes space-time joint adaptive anti-interference processing adopting a minimum mean square error criterion, so that the gain control on the communication signal is kept while the multi-direction interference signal is subjected to zero adjustment suppression.
Furthermore, in the processing flow of the receiving signal at the receiving end, the multi-array element antenna is used for receiving the radio frequency communication signal and the radio frequency guide signal, and independent preprocessing is carried out on the multiple paths of receiving signals, and the preprocessing flow of each path of receiving signals is completely the same.
Further, the demodulation and reconstruction of the pilot signal comprises the sub-steps of: the I/Q data output by the anti-interference processing of the pilot signal is utilized to realize the capture tracking, the delay phase adjustment and the re-expansion of the spread spectrum signal of the pilot signal, and the original pilot signal is recovered.
A computer device comprising a processor and a memory, the memory having stored therein a computer program which, when loaded by the processor and executed, carries out the method of any preceding claim.
A computer-readable storage medium, in which a computer program is stored which is loaded by a processor and which performs the method according to any of the above.
The beneficial effects of the invention include:
the invention takes the anti-interference capability of a satellite communication system enhanced under the condition of strong interference as a starting point, breaks through the inhibition of interference signals by a blind self-adaptive anti-interference algorithm realized by designing a guide signal when a conventional guide vector acquisition method fails, solves the application limitation of the current low-frequency-band communication signal spatial filtering technology on a miniaturized platform, improves the space-time joint anti-interference capability of a small-size array antenna (the array element spacing is less than 0.5 times of the wavelength), and is particularly suitable for the low-frequency-band satellite communication system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a space-time joint anti-interference processing structure suitable for satellite communication according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a processing flow of a space-time joint anti-interference transmission signal according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a processing flow of a space-time joint anti-interference received signal according to an embodiment of the present invention.
Detailed Description
All features disclosed in all embodiments in this specification, or all methods or process steps implicitly disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.
As shown in fig. 1, the method of the present invention is intended to improve the suppression capability of the satellite communication system against high-intensity interference. In a specific embodiment, the method of the embodiment of the invention is applicable to a satellite communication system of a small-distance array antenna, and the satellite communication system comprises a transmitting end and a receiving end. The technical scheme of space-time joint anti-interference processing suitable for satellite communication, which is provided by the method of the embodiment of the invention, mainly comprises two parts, namely generation of a transmitting signal and anti-interference processing of a receiving signal. In the specific implementation mode, the following technical concepts are included: the transmitting terminal firstly detects the transmitting state and the signal power of a transmitted communication signal, then generates a guide signal and aligns with the transmitting time slot of the communication signal, simultaneously dynamically adjusts the transmitting state and the power of the guide signal in real time, and finally combines the radio frequency guide signal and the radio frequency communication signal and transmits the combined signal through a transmitting antenna. The receiving end firstly preprocesses satellite communication signals and guide signals received by the array antenna, synchronously samples the satellite communication signals and the guide signals, then carries out space-time joint adaptive anti-interference processing of a Power Inverse-PI (Power Inverse-PI) on the guide signals, completes demodulation and reconstruction of the guide signals, calculates array guide vectors of the communication signals by using the reconstructed guide signals, realizes real-time calculation of the guide vectors of the small-size array antenna, thereby realizing real-time calibration of response parameters of the communication signal array, then carries out space-time joint adaptive anti-interference processing of a Minimum Mean Square Error (MMSE) criterion on the communication signals, realizes zero adjustment and suppression on the multi-direction interference signals, simultaneously keeps gain control on the communication signals, guarantees communication capacity under a high interference-signal ratio environment, and finally generates anti-interference radio frequency receiving communication signals through signal up-conversion processing and sends the anti-interference radio frequency receiving communication signals to a satellite communication terminal.
As shown in fig. 2, in a further inventive concept, a specific process of processing a space-time joint anti-interference transmitting signal suitable for satellite communication in the method of the embodiment of the present invention includes: detecting the state and power of a communication signal, modulating a pilot signal, controlling the transmission power of the pilot signal, generating an analog radio frequency pilot signal, and performing analog synthesis and transmission of the pilot signal and the communication signal.
Step 1: the state and power detection of the communication signal. Detecting the transmitting state of the communication signal of the satellite communication terminal so as to control a modulation switch of the pilot signal; and simultaneously, the signal power of the transmitted communication signal is detected, and the power of the pilot signal is controlled and adjusted.
And 2, step: modulation of the pilot signal. The pilot signal is a parasitic signal hidden under the communication signal, and a direct sequence spread spectrum signal with a low power spectral density may be used as the pilot signal, but is not limited thereto. The spread spectrum code of the direct sequence spread spectrum signal adopts a pseudo random sequence, and has good autocorrelation and cross correlation. Meanwhile, the pilot signal modulation generation needs to be aligned with the transmission time slot of the communication signal.
And step 3: control of pilot signal transmit power. Because of the time-varying transmission state and power of the communication signal, and the power of the pilot signal needs to be lower than that of the communication signal, the transmitting end of the pilot signal needs to adjust the transmission power of the pilot signal in real time according to the power value of the current communication signal. And comparing the power value calculated by the communication signal with the power value of the current pilot signal, and judging whether the power value of the pilot signal needs to be adjusted.
And 4, step 4: generation of an analog radio frequency pilot signal. The guide signal of the digital baseband is subjected to digital-to-analog conversion, so that the conversion from a digital signal to an analog signal and analog up-conversion are realized, an analog radio frequency guide signal is generated, and the radio frequency is the same as the frequency of the communication signal.
And 5: analog synthesis and transmission of pilot and communication signals. The analog radio frequency guide signal and the communication signal are subjected to signal synthesis at a radio frequency end, and a path of radio frequency signal is output to a transmitting antenna to realize the transmission of the synthesized signal.
As shown in fig. 3, in a further inventive concept, a specific process of processing a space-time joint anti-interference received signal suitable for satellite communication in the method of the embodiment of the present invention includes: the method comprises the following steps of array signal preprocessing, guide signal anti-interference processing, guide signal demodulation and reconstruction, array guide vector calculation, communication signal weight calculation, communication signal digital beam synthesis, digital-to-analog conversion, up-conversion processing and the like, wherein the array signal preprocessing comprises array signal receiving and data preprocessing, and autocorrelation matrix and inverse matrix calculation thereof; the anti-interference processing of the guide signals comprises calculation of guide signal weights and digital beam synthesis of the guide signals. The details are as follows:
step 1: array signal reception and data preprocessing. The four-array element antenna is adopted to receive the radio frequency communication signal and the radio frequency guide signal, and the four received signals are independently processed, and the processing flow of a certain received signal is taken as an example for explanation, and the processing flows of the other three received signals are completely the same. The received signal is amplified, filtered and frequency-converted to output an analog intermediate frequency signal, then the analog intermediate frequency signal enters an ADC chip to be digitally sampled to obtain a digital intermediate frequency sampled signal, and finally the digital intermediate frequency sampled signal is digitally down-converted and digitally low-pass filtered to obtain I/Q digital baseband data.
Step 2: calculation of autocorrelation matrices and their inverse matrices
In the autocorrelation matrix calculation of the I/Q digital baseband data, the autocorrelation matrix calculation module solves the statistical average of the products of the consecutive N groups of I/Q digital baseband data and the conjugate transpose data thereof to obtain the following autocorrelation matrix R:
wherein, x (n) = [ x ] 1 (n),x 2 (n),x 3 (n),x 4 (n)] T The I/Q digital baseband data of the array antenna is represented, N is the number of sampling data groups, N is the serial number of the sampling data, and H represents the conjugate transpose operation of the matrix.
In the calculation of the autocorrelation inverse matrix of the I/Q digital baseband data, the autocorrelation matrix inversion module carries out inversion operation on the autocorrelation matrix to obtain the following autocorrelation inverse matrix R -1 :
R -1 ＝inv(R)
Wherein inv (·) represents the inverse computation of the matrix.
And step 3: pilot signal weight calculation
The guide signal weight calculation module calculates the optimal weight coefficient w according to the PI criterion PI ：
Wherein R is -1 Is the autocorrelation inverse matrix of the I/Q digital baseband data, b is a constant, b = [1,0,0,0 =] T 。
And 4, step 4: steering signal digital beam synthesis
The guide signal digital beam synthesis module performs complex multiplication on the guide signal weight coefficient and the corresponding I/Q digital baseband data to obtain I/Q data corresponding to the m sampling moments after the guide signal anti-interference processing:
wherein x is i (m) I/Q digital baseband data representing the mth sampling instant of the I antenna,
is w PI Conjugate of the ith row coefficient.
And 5: demodulation and reconstruction of pilot signals
The pilot signal demodulation and reconstruction module utilizes I/Q data output by the pilot signal anti-interference processing to realize capture tracking, delay phase adjustment and re-expansion of spread spectrum signals of the pilot signals and restore the original pilot signals. The recovered pilot signal is sent to the array steering vector calculation module. The processing flow of the pilot signal demodulation and reconstruction module mainly comprises the steps of pilot signal capturing and tracking, local synchronous spread spectrum code generation, signal delay adjustment and spread spectrum signal re-spreading. After the pilot signal is captured and tracked at a receiving end, a data signal is obtained through de-spreading and judgment, and then the data signal is re-spread by using a local synchronous spreading code, so that the reconstruction of the original pilot signal can be obtained.
Step 6: array steering vector calculation
In the calculation of the array steering vector, the array steering vector calculation module uses the reconstructed guide signal as a reference signal and calculates the array steering vector r of the communication signal in real time according to the correlation between the reference signal and the array receiving signal xd ：
r xd ＝E[x(t)d * (t)]，
Wherein d is * (t) is the conjugate of the reconstructed pilot signal, and x (t) is the I/Q digital baseband data of the array received signal.
And 7: communication signal weight calculation
In the calculation of the communication signal weight, the communication signal weight calculation module calculates the optimal weight coefficient w according to the Minimum Mean Square Error (MMSE) criterion MMSE ：
w MMSE ＝R -1 r xd ，
Wherein R is -1 Is an inverse autocorrelation matrix, r, of the I/Q digital baseband data xd A vector is directed to an array of communication signals.
And 8: digital beamforming of communication signals
The communication signal digital beam synthesis module performs complex multiplication on the communication signal weight coefficient and the corresponding I/Q digital baseband data to obtain I/Q data corresponding to the m sampling moments after the anti-interference processing of the communication signals:
wherein x is i (m) I/Q digital baseband data representing the mth sampling instant of the I antenna,
is w MMSE The conjugate of the ith row coefficient.
And step 9: digital-to-analog conversion and up-conversion processing
The digital-to-analog conversion and up-conversion processing module is used for firstly performing digital-to-analog conversion on I/Q data output by the anti-interference processing of the communication signals, then performing analog up-conversion processing, mixing single carrier signals with the same frequency as down-conversion frequency, performing power matching setting, and outputting analog radio frequency communication signals subjected to the anti-interference processing to the satellite communication terminal. According to the implementation of the steps, the space-time joint anti-interference processing of the satellite communication signals is achieved.
Example 1
A space-time joint anti-interference method suitable for satellite communication comprises the following steps:
the processing flow of the transmitting end transmitting signal: detecting the transmitting state and the signal power of a transmitted communication signal, then generating a pilot signal, controlling a modulation switch of the pilot signal by using the detected transmitting state of the transmitted communication signal, and controlling and adjusting the power of the pilot signal by using the detected signal power of the transmitted communication signal, wherein the power of the pilot signal is lower than that of the communication signal; then combining the guide signal and the communication signal and transmitting the combined signal through a transmitting antenna;
the receiving end receives the signal processing flow: preprocessing a communication signal and a guide signal received by an array antenna, then performing anti-interference processing on the guide signal, completing demodulation and reconstruction of the guide signal, and then calculating an array guide vector of the communication signal by using the reconstructed guide signal; then, the anti-interference processing is carried out on the communication signals, and finally, the anti-interference output radio frequency receiving communication signals are generated through the signal up-conversion processing.
Example 2
On the basis of embodiment 1, in the processing flow of transmitting signal at the transmitting end, the pilot signal is aligned with the transmission time slot of the communication signal, and the transmitting state and power of the pilot signal are dynamically adjusted.
Example 3
On the basis of embodiment 1, the pilot signal is a parasitic signal hidden under the communication signal, and includes a direct sequence spread spectrum signal with low power spectral density as the pilot signal.
Example 4
On the basis of embodiment 1, specifically, the calculating the array steering vector of the communication signal by using the reconstructed steering signal uses the reconstructed steering signal as a reference signal, and calculates the array steering vector of the communication signal according to the correlation between the reference signal and the array receiving signal, so as to implement real-time calibration of the communication signal array response parameter.
Example 5
On the basis of the embodiment 1, the performing anti-interference processing on the pilot signal includes performing space-time joint adaptive anti-interference processing based on a power inversion criterion to achieve anti-interference reception of the pilot signal.
Example 6
On the basis of the embodiment 1, the anti-interference processing on the communication signal includes space-time joint adaptive anti-interference processing using a minimum mean square error criterion, so that the gain control on the communication signal is maintained while the multi-direction interference signal is subjected to zero adjustment suppression.
Example 7
On the basis of embodiment 1, in the processing flow of the receiving signal at the receiving end, the multi-array element antenna is used for receiving the radio frequency communication signal and the radio frequency pilot signal, and independent preprocessing is performed on multiple paths of receiving signals, and the preprocessing flow of each path of receiving signals is completely the same.
Example 8
On the basis of embodiment 1, the demodulation and reconstruction of the pilot signal includes the sub-steps of: the I/Q data output by the anti-interference processing of the pilot signal is utilized to realize the capture tracking, the delay phase adjustment and the re-expansion of the spread spectrum signal of the pilot signal, and the original pilot signal is recovered.
Example 9
A computer device comprising a processor and a memory, the memory having stored therein a computer program which, when loaded by the processor, performs the method of any of embodiments 1 to 8.
Example 10
A computer-readable storage medium, in which a computer program is stored which is loaded by a processor and which performs the method according to any one of embodiments 1 to 8.
The units described in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves.
According to an aspect of the application, a computer program product or computer program is provided, comprising computer instructions, the computer instructions being stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the method provided in the various alternative implementations described above.
As another aspect, the present application also provides a computer-readable medium, which may be contained in the electronic device described in the above embodiments; or may exist separately without being assembled into the electronic device. The computer readable medium carries one or more programs which, when executed by an electronic device, cause the electronic device to implement the method described in the above embodiments.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
The above-described embodiments are merely exemplary embodiments of the present invention, and it will be readily apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the above-described embodiments, and therefore the above-described embodiments are to be considered in all respects as preferred and not restrictive.
Other embodiments than the above examples may be devised by those skilled in the art based on the foregoing disclosure, or by adapting and using knowledge or techniques of the relevant art, and features of various embodiments may be interchanged or substituted and such modifications and variations that may be made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the following claims.
Claims (10)
1. A space-time joint anti-interference method suitable for satellite communication is characterized by comprising the following steps:
the processing flow of the transmitting end transmitting signal: detecting the transmitting state and the signal power of a transmitted communication signal, then generating a pilot signal, controlling a modulation switch of the pilot signal by using the detected transmitting state of the transmitted communication signal, and controlling and adjusting the power of the pilot signal by using the detected signal power of the transmitted communication signal, wherein the power of the pilot signal is lower than that of the communication signal; then combining the guide signal and the communication signal and transmitting the combined signal through a transmitting antenna;
the receiving end receives the signal processing flow: preprocessing a communication signal and a guide signal received by an array antenna, then performing anti-interference processing on the guide signal, completing demodulation and reconstruction of the guide signal, and then calculating an array guide vector of the communication signal by using the reconstructed guide signal; then, the anti-interference processing is carried out on the communication signals, and finally, the anti-interference output radio frequency receiving communication signals are generated through the signal up-conversion processing.
2. A space-time joint interference avoidance method according to claim 1, wherein in the processing procedure of transmitting signals at the transmitting end, the pilot signals are aligned with the transmission time slots of the communication signals, and the transmission states and powers of the pilot signals are dynamically adjusted.
3. A space-time joint interference rejection method for satellite communication according to claim 1, wherein said pilot signal is a parasitic signal hidden under a communication signal, and comprises a direct sequence spread spectrum signal with low power spectral density as said pilot signal.
4. A space-time joint anti-interference method suitable for satellite communication according to claim 1, wherein the calculating of the array steering vector of the communication signal by using the reconstructed steering signal is specifically to calculate the array steering vector of the communication signal by using the reconstructed steering signal as a reference signal according to a correlation between the reference signal and an array receiving signal, so as to implement real-time calibration of a response parameter of the communication signal array.
5. A space-time joint interference rejection method for satellite communication according to claim 1, wherein said performing interference rejection processing on the pilot signal includes performing interference rejection processing on the pilot signal using space-time joint adaptive interference rejection based on a power inversion criterion.
6. A space-time joint anti-jamming method suitable for satellite communication according to claim 1, wherein the anti-jamming processing on the communication signal includes space-time joint adaptive anti-jamming processing using minimum mean square error criterion, which achieves zero-setting suppression on multi-directional jamming signals while maintaining gain control on the communication signal.
7. A space-time joint anti-interference method suitable for satellite communication according to claim 1, wherein in the received signal processing procedure at the receiving end, the multi-element antenna is used to receive the rf communication signal and the rf pilot signal, and the multiple received signals are independently preprocessed, and the preprocessing procedure for each received signal is identical.
8. A space-time joint interference rejection method for satellite communication according to claim 1, wherein said demodulating and reconstructing pilot signals comprises the sub-steps of: the I/Q data output by the anti-interference processing of the pilot signal is utilized to realize the capture tracking, the delay phase adjustment and the re-expansion of the spread spectrum signal of the pilot signal, and the original pilot signal is recovered.
9. A computer arrangement, characterized in that the computer arrangement comprises a processor and a memory, in which a computer program is stored which, when being loaded by the processor, carries out the method according to any one of claims 1-8.
10. A computer-readable storage medium, in which a computer program is stored which is loaded by a processor and which executes a method according to any one of claims 1 to 8.
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| CN109633692A (en) * | 2018-11-26 | 2019-04-16 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | GNSS navigation satellite signal anti-interference processing method |
| CN113630152A (en) * | 2021-10-11 | 2021-11-09 | 中国人民解放军海军工程大学 | Guiding type digital anti-interception anti-interference device and method |
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