Anti-interference method based on phased-array antenna

Abstract

The invention discloses an anti-interference method based on a phased-array antenna, and belongs to the technical field of phased-array antennas. The method comprises the following steps: S1, carrying out phased-array antenna beam angle calculation according to acquired geographic position information and attitude information, and communicating with a communication target; s2, carrying out interference source target scanning on the coverage airspace, respectively obtaining multiple groups of target position data, and forming multiple groups of position matrixes; s3, screening out a real interference source target; s4, accurately positioning a real interference source target by using a difference beam, and determining an accurate coordinate of the real interference source target to obtain an interference source position; and S5, performing anti-interference processing on the position of the interference source, performing communication in a narrow beam mode, and performing zero setting processing on the position of the real interference source in the phased array directional diagram to realize system anti-interference. According to the invention, the communication influence of interference signals on the phased-array antenna is reduced, the anti-interference performance of the phased-array antenna is greatly improved, and the communication reliability of the phased-array antenna is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of phased array antennas, and in particular to an anti-jamming method based on a phased array antenna. Background Art

[0002] With the rapid iteration of wireless communication technologies, millimeter-wave communication is also rapidly updated and upgraded. The millimeter-wave phased array antenna technology gradually highlights its position in the field of millimeter-wave communication, and corresponding communication countermeasures follow.

[0003] The communication jamming target is the communication receiving system, and the purpose is to weaken and destroy its signal perception and information transmission and exchange capabilities. Effective jamming requires sending the jamming signal to the communication receiver at the same time as the communication signal arrives at the receiver, covering or interfering with the enemy's signal, so that the receiving system cannot correctly identify the information. The common anti-jamming methods of the receiving system mainly include adding shielding materials such as frequency selective surfaces, and also using technologies such as automatic frequency hopping and spread spectrum, and there are also complex adaptive anti-jamming algorithms. Such anti-jamming methods are difficult to implement and require additional hardware, and the cost of the entire system is relatively high. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an anti-jamming method based on a phased array antenna.

[0005] The purpose of the present invention is achieved by the following technical solutions: an anti-jamming method based on a phased array antenna, for a millimeter-wave broadband phased array antenna, includes the following steps: S1: The baseband processor obtains the geographical location information and attitude information of the current system through the positioning system, calculates the beam angle of the phased array antenna according to the obtained geographical location information and attitude information, and communicates with the communication target; S2: The array surface of the millimeter-wave broadband phased array antenna is divided into multiple receiving sub-arrays, and wide beams are used to scan the interference source targets in the covered airspace respectively, and multiple groups of target position data are obtained respectively, forming multiple groups of position matrices; S3: The baseband processor draws a target coordinate distribution map for multiple groups of position matrices, and performs overlapping analysis on the target coordinate distribution map to screen out the real interference source targets; S4: For the real interference source targets screened out, the baseband processor controls the broadband phased array antenna to form a difference beam, and uses the difference beam to accurately locate the real interference source targets to determine their accurate coordinates to obtain the interference source position; S5: Anti-jamming processing is performed on the interference source position, communication is performed in the narrow beam mode, and at the same time, nulling processing is performed on the position of the real interference source in the phased array pattern to achieve system anti-jamming.

[0006] Preferably, the S1 specifically includes the following steps: After the millimeter-wave broadband phased array antenna is powered on, the baseband processor independently and real-time queries the current geographical location information and attitude information, and then calculates the theoretical pointing of the millimeter-wave broadband phased array antenna based on the geographical location of the communication target input by the user. At this time, the azimuth angle As and elevation angle Es of the millimeter-wave broadband phased array antenna are calculated as follows: ; Where ∆φ = φ g - φ s , φs is the longitude of the communication target, λs is the latitude of the communication target, hs is the height of the communication target from the ground, R is the radius of the earth, φg is the longitude of the location where the millimeter-wave broadband phased array antenna is located, λg is the latitude of the location where the millimeter-wave broadband phased array antenna is located, and hg is the altitude of the location where the millimeter-wave broadband phased array antenna is located; Then, based on the real-time attitude data collected by the inertial navigation, calculate the real-time pointing of the millimeter-wave broadband phased array antenna, and then real-time correct the beam pointing, so that the millimeter-wave broadband phased array antenna communicates with the communication target dynamically. The calculation formula for the real-time pointing of the millimeter-wave broadband phased array antenna is as follows: ; Where A G is the azimuth angle of the communication target, E G is the elevation angle of the communication target, H is the heading angle of the attitude of the millimeter-wave broadband phased array antenna, P is the elevation angle of the attitude of the millimeter-wave broadband phased array antenna, R G is the roll angle of the attitude of the millimeter-wave broadband phased array antenna, A b is the azimuth angle in the coordinate system of the location where the millimeter-wave broadband phased array antenna is located, E b is the elevation angle in the coordinate system of the location where the millimeter-wave broadband phased array antenna is located; convert the real-time pointing of the millimeter-wave broadband phased array antenna into antenna coordinates, that is, the off-axis angle θ = 90–E b ; the azimuth angle φ = 180–A b .

[0007] Preferably, the S2 specifically includes the following steps: The baseband processor issues an instruction to make the millimeter-wave broadband phased array antenna work in the interference recognition mode. The internal processor of the phased array antenna automatically enters the multi-beam reception working mode, divides the entire array surface into multiple output areas, each output area outputs an independent reception beam, each reception beam scans the same airspace respectively, receives the interference signals in the airspace, records the spatial coordinate positions and signal intensities of each interference signal, and forms an interference source position matrix. The interference source position matrix is as follows: ; Where Xn 、 Yn 、Zn The X-axis coordinate, Y-axis coordinate, and Z-axis coordinate of the interference source in three-dimensional space together form the spatial coordinate position of the interference source. Pn is the signal strength corresponding to the interference source. n is the number of interference sources, and m is the number of position matrices; each receiving beam in each quadrant will output a position matrix, so there are multiple position matrices of interference sources for the millimeter-wave broadband phased array antenna at the same time.

[0008] Preferably, step S3 specifically includes the following steps: The baseband processor processes the multiple groups of position matrices obtained at the same time, analyzes the matrix data to redraw the target coordinate distribution map of the interference source, then overlaps and analyzes multiple target coordinate distribution maps of the interference source to form a target coordinate distribution map. Mark the positions where the position matrices within the first preset value range in the target coordinate distribution map are all recorded as real interference source targets, mark the positions where the position matrices within the second preset value range in the target coordinate distribution map are recorded as suspicious interference source targets, and mark the non-overlapping positions in the target coordinate distribution map as false interference source targets; then process the analysis results, record the information of the suspicious interference source targets and real interference source targets, and discard the information of the false interference source targets; the minimum value of the first preset value range is greater than the maximum value of the second preset value range.

[0009] Preferably, step S4 specifically includes the following steps: After obtaining the basic information of the real interference source target, it will be accurately positioned. The baseband processor issues an accurate positioning instruction, and the internal processor of the millimeter-wave broadband phased array antenna controls the millimeter-wave broadband phased array antenna to form a two-dimensional difference beam, and then performs beam scanning at the coordinate position where the real interference source target is located to obtain the exact coordinate position of the real interference source target, and feedback it to the baseband processor to obtain the interference source position.

[0010] Preferably, when executing S4, the millimeter-wave broadband phased array antenna is set to execute the interference recognition mode cyclically.

[0011] Preferably, step S5 specifically includes the following steps: After the baseband processor obtains the interference source position, it analyzes the beam pointing required for current communication, and at the same time processes the real interference source, issues an instruction to make the millimeter-wave broadband phased array antenna work in the communication working mode. The millimeter-wave broadband phased array antenna forms a narrow beam to communicate with the communication target, and uses the real-time nulling algorithm of the phased array antenna to perform nulling processing on the radiation pattern of the millimeter-wave broadband phased array antenna at this time, so that when the real interference source signal is transmitted to the aperture surface of the millimeter-wave broadband phased array antenna, there is a level difference greater than the preset level difference, avoiding interference from the real interference source to the millimeter-wave broadband phased array antenna.

[0012] Preferably, the real-time nulling algorithm for the phased array antenna is obtained by combining the genetic algorithm and the phased array antenna algorithm.

[0013] Preferably, the real-time nulling algorithm for the phased array antenna includes the following steps: Initialize the parameters of the phased array antenna; Set the nulling optimization target according to the position information and attitude information of the real interference source target; Draw the theoretical radiation pattern of the phased array antenna; Call the genetic algorithm to iteratively obtain the optimal nulling result by phase weighting of the phased array antenna; Substitute the optimal nulling result to draw the nulling radiation pattern of the phased array antenna.

[0014] Preferably, the genetic algorithm includes the following steps: Initialize the population; calculate the fitness for the first time; perform the selection operation; perform the crossover operation; perform the mutation operation; generate a new population; calculate the fitness again; Judge whether the termination condition is satisfied. If it is satisfied, obtain the optimal solution. If it is not satisfied, re-execute the selection operation and subsequent steps until the termination condition is satisfied.

[0015] Preferably, there are four receiving sub-arrays, four groups of target position data, and four groups of position matrices.

[0016] The beneficial effects of the present invention are as follows: 1) Based on the characteristics and algorithms of the phased array antenna, the present invention reduces the communication influence of interference signals on the phased array antenna, greatly improves the anti-interference ability of the phased array antenna, and ensures the communication reliability of the phased array antenna; the implementation method is simple, without additional hardware costs, and has high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flowchart of the anti-interference method based on the phased array antenna; Figure 2 is a distribution diagram of the coordinates of the interference source target; Figure 3 is a flowchart of the real-time nulling algorithm for the phased array antenna; Figure 4 is a schematic diagram of the nulling of the radiation pattern of the phased array antenna; Figure 5 is a convergence diagram of the nulling of the genetic algorithm for the phased array antenna. DETAILED DESCRIPTION OF THE INVENTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0019] Referring to Figures 1 - 5 , the first aspect of the present invention provides: an anti-interference method based on a phased array antenna for a millimeter-wave broadband phased array antenna, including the following steps: S1: The baseband processor obtains the geographical location information and attitude information of the current system through the positioning system, calculates the beam angle of the phased array antenna according to the obtained geographical location information and attitude information, and communicates with the communication target; S2: The array surface of the millimeter-wave broadband phased array antenna is divided into multiple receiving sub-arrays, and wide beams are used to scan the interference source targets in the covered airspace respectively, and multiple groups of target position data are obtained respectively, forming multiple groups of position matrices; S3: The baseband processor draws a target coordinate distribution map for multiple groups of position matrices, and performs overlapping analysis on the target coordinate distribution map to screen out real interference source targets; S4: For the real interference source targets screened out, the baseband processor controls the broadband phased array antenna to form a difference beam, and uses the difference beam to accurately locate the real interference source targets to determine their accurate coordinates to obtain the interference source position; S5: Anti-interference processing is performed on the interference source position, communication is carried out in the narrow beam mode, and at the same time, nulling processing is performed on the position of the real interference source in the phased array pattern to achieve system anti-interference.

[0020] In this embodiment, the number of receiving sub-arrays can be set according to the actual working environment and working needs. The number of groups of target position data and position matrices obtained is the same as the number of receiving sub-arrays set. In a preferred embodiment, the number of receiving sub-arrays is set to four, and the scanning airspace can be divided into four quadrants.

[0021] In some embodiments, step S1 specifically includes the following steps: After the millimeter-wave broadband phased array antenna is powered on, the baseband processor independently and real-time queries the geographical location information and attitude information of the current location, and then calculates the theoretical pointing of the millimeter-wave broadband phased array antenna according to the geographical location of the communication target input by the user. At this time, the azimuth angle As and elevation angle Es of the millimeter-wave broadband phased array antenna are calculated as follows: ; where ∆φ = φ g -φ s, φs is the longitude of the communication target, λs is the latitude of the communication target, hs is the height of the communication target from the ground, R is the radius of the Earth, φg is the longitude of the location where the millimeter-wave broadband phased array antenna is located, λg is the latitude of the location where the millimeter-wave broadband phased array antenna is located, and hg is the altitude of the location where the millimeter-wave broadband phased array antenna is located; Then, based on the real-time attitude data collected by the inertial navigation, calculate the real-time pointing of the millimeter-wave broadband phased array antenna, and then correct the beam pointing in real time, so that the millimeter-wave broadband phased array antenna communicates with the communication target dynamically. The calculation formula for the real-time pointing of the millimeter-wave broadband phased array antenna is as follows: ; Among them, A G is the azimuth angle of the communication target, E G is the elevation angle of the communication target, H is the heading angle of the attitude of the millimeter-wave broadband phased array antenna, P is the elevation angle of the attitude of the millimeter-wave broadband phased array antenna, R G is the roll angle of the attitude of the millimeter-wave broadband phased array antenna, A b is the azimuth angle in the coordinate system of the location where the millimeter-wave broadband phased array antenna is located, E b is the elevation angle in the coordinate system of the location where the millimeter-wave broadband phased array antenna is located; convert the real-time pointing of the millimeter-wave broadband phased array antenna into antenna coordinates, that is, the off-axis angle θ = 90–E b ; the azimuth angle φ = 180–A b .

[0022] In this embodiment, after the millimeter-wave broadband phased array antenna is powered on, the baseband processor autonomously and real-time queries the current geographical location information and attitude information, and then calculates the theoretical pointing of the phased array antenna according to the geographical location of the communication target input by the user.

[0023] In some embodiments, step S2 specifically includes the following steps: The baseband processor issues an instruction to make the millimeter-wave broadband phased array antenna work in the interference recognition mode. The internal processor of the phased array antenna automatically enters the multi-beam reception working mode, divides the entire array surface into multiple output areas, each output area outputs an independent reception beam, each reception beam scans the same airspace respectively, receives the interference signals in the airspace, records the spatial coordinate positions and signal intensities of each interference signal, and forms an interference source position matrix. The interference source position matrix is as follows: ; Among them Xn , Yn , Zn are the X-axis coordinate, Y-axis coordinate and Z-axis coordinate of the interference source in the three-dimensional space, which together form the spatial coordinate position of the interference source, Pn is the signal intensity corresponding to the interference source, nis the number of interference sources, and m is the number of position matrices; each receiving beam in each quadrant will output a position matrix, so there are multiple position matrices of interference sources for the millimeter-wave broadband phased array antenna at the same time.

[0024] In this embodiment, after the millimeter-wave broadband phased array antenna completes system positioning to obtain the required geographical coordinates and attitude information, interference source detection is carried out. The baseband processor issues an instruction to make the phased array antenna work in the interference recognition mode. The internal processor of the phased array antenna automatically enters the multi-beam receiving working mode. The entire array surface is divided into four quadrants, and each quadrant outputs an independent receiving beam. Each beam scans the same airspace respectively, receives the interference signals in the airspace, records the spatial coordinate positions and signal intensities of each interference signal, and forms an interference source position matrix.

[0025] In some embodiments, step S3 specifically includes the following steps: The baseband processor processes the multiple groups of position matrices obtained at the same time, analyzes the matrix data to redraw the interference source target coordinate distribution map, and then overlaps and analyzes multiple interference source target coordinate distribution maps to form a target coordinate distribution map. The positions where the position matrices within the first preset numerical range in the target coordinate distribution map are all recorded are marked as real interference source targets, the positions where the position matrices within the second preset numerical range in the target coordinate distribution map are recorded are marked as suspicious interference source targets, and the non-overlapping positions in the target coordinate distribution map are marked as false interference source targets; then the analysis results are processed, the information of the suspicious interference source targets and real interference source targets is recorded, and the information of the false interference source targets is discarded; the minimum value of the first preset numerical range is greater than the maximum value of the second preset numerical range.

[0026] In this embodiment, the first preset numerical range and the second preset numerical range are values or value ranges preset according to the actual working environment and working needs, and are not limited to a specific value or value range, as long as the minimum value of the first preset numerical range is greater than the maximum value of the second preset numerical range; when the number of receiving sub-arrays is four, the first preset numerical range is 4, and the second preset range is 2-3. In a preferred embodiment, after obtaining four groups of interference source position matrices, the baseband processor processes the data of these four groups of position matrices obtained at the same time, analyzes the matrix data to redraw the interference source target coordinate distribution map, and then overlaps and analyzes the four interference source target coordinate distribution maps to form the interference source target coordinate distribution map of the phased array antenna (see Figure 2), mark the positions recorded in all four position matrices in the target coordinate distribution map as real interference source targets, mark the positions recorded in two or three position matrices in the target coordinate distribution map as suspicious interference source targets, and mark the non-overlapping positions in the target coordinate distribution map as false interference source targets; then process the analysis results, record the information of suspicious interference source targets and real interference source targets, and discard false interference source targets.

[0027] In some embodiments, step S4 specifically includes the following steps: After obtaining the basic information of the real interference source target, it will be accurately positioned. The baseband processor issues an accurate positioning instruction, and the internal processor of the millimeter-wave broadband phased array antenna controls the millimeter-wave broadband phased array antenna to form a two-dimensional difference beam, and then performs beam scanning at the coordinate position where the real interference source target is located to obtain the exact coordinate position of the real interference source target, and feeds it back to the baseband processor to obtain the interference source position.

[0028] In this embodiment, after obtaining the basic information of the interference source target, it will be accurately positioned. The baseband processor issues an accurate positioning instruction, and the internal processor of the phased array antenna controls the phased array antenna to form a two-dimensional difference beam, and then performs a fast and accurate beam scanning at the coordinate position where the obtained interference source target is located to obtain the exact coordinate position of the interference source target, and feeds it back to the baseband processor. To ensure the accuracy of the coordinates and the dynamic and static confirmation of the target, the phased array antenna can execute the interference recognition mode in a loop.

[0029] In some embodiments, when executing S4, the millimeter-wave broadband phased array antenna is set to execute the interference recognition mode in a loop.

[0030] In some embodiments, step S5 specifically includes the following steps: After the baseband processor obtains the interference source position, it analyzes the beam direction required for current communication, and at the same time processes the real interference source, issues an instruction to make the millimeter-wave broadband phased array antenna work in the communication working mode. The millimeter-wave broadband phased array antenna forms a narrow beam to communicate with the communication target, and uses the real-time nulling algorithm of the phased array antenna to perform nulling processing on the radiation pattern of the millimeter-wave broadband phased array antenna at this time, so that when the real interference source signal is transmitted to the aperture surface of the millimeter-wave broadband phased array antenna, there is a level difference greater than the preset level difference, avoiding interference from the real interference source to the millimeter-wave broadband phased array antenna.

[0031] In this embodiment, after the baseband processor obtains the position of the interference source, it analyzes the beam direction required for current communication, processes the interference source at the same time, issues an instruction to make the phased array antenna work in the communication working mode, the phased array antenna forms a narrow beam to communicate with the target, and at the same time uses the genetic algorithm to perform nulling processing on the radiation pattern of the phased array antenna at this time, so that when the interference source signal is transmitted to the aperture of the phased array antenna, there is a large level difference, avoiding interference from the interference source to the phased array antenna.

[0032] In some embodiments, the real-time nulling algorithm of the phased array antenna is obtained by combining the genetic algorithm and the phased array antenna algorithm.

[0033] In this embodiment, the genetic algorithm is an optimization method that simulates natural selection and genetic mechanisms. It searches for the solution set of the problem by simulating the biological evolution process. During the solution process, it starts from any initial population, and through random selection, crossover and mutation operations, generates a group of individuals that are more suitable for the environment, and evolves generation by generation to obtain the optimal solution. The genetic algorithm is the most commonly used and mature algorithm. By combining the genetic algorithm with the phased array antenna algorithm, the real-time nulling algorithm of the phased array antenna can be obtained. The flow of the real-time nulling algorithm of the phased array antenna is as Figure 3 shown.

[0034] In some embodiments, the real-time nulling algorithm of the phased array antenna includes the following steps: Initialize the parameters of the phased array antenna; Set the nulling optimization target according to the position information and attitude information of the real interference source target; Draw the theoretical radiation pattern of the phased array antenna; Call the genetic algorithm to iteratively obtain the optimal nulling result by phase weighting of the phased array antenna; Substitute the optimal nulling result to draw the nulling radiation pattern of the phased array antenna.

[0035] In this embodiment, when the algorithm works, it first initializes the parameters of the phased array antenna, then sets the nulling optimization target according to the position information and attitude information of the interference source target, then draws the theoretical radiation pattern of the phased array antenna, and then calls the genetic algorithm to quickly iteratively obtain the optimal nulling result by phase weighting of the phased array antenna. The nulling convergence process of the genetic algorithm is as Figure 5 shown, and finally substitute the nulling result to draw the nulling radiation pattern of the phased array antenna. Compare the radiation patterns before and after nulling according to the results of the real-time nulling algorithm of the phased array antenna, as Figure 4As shown, before zero adjustment, the sidelobe level at the interference source position of the pattern (M1) is -20.1461 dB. After zero adjustment, the sidelobe level at the interference source position of the pattern (M2) is -36.909 dB. After zero adjustment, the suppression of the interference source by the phased array antenna increases by 16.7629 dB, reducing the communication impact of the interference signal on the phased array antenna, greatly enhancing the anti-interference ability of the phased array antenna, and ensuring the communication reliability of the phased array antenna.

[0036] In some embodiments, the genetic algorithm includes the following steps: Initialize the population; calculate the fitness for the first time; perform the selection operation; perform the crossover operation; perform the mutation operation; generate a new population; calculate the fitness again; Determine whether the termination condition is met. If it is met, obtain the optimal solution. If it is not met, re-perform the selection operation and subsequent steps until the termination condition is met.

[0037] In some embodiments, there are four receiving sub-arrays, four sets of target position data, and four sets of position matrices.

[0038] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. An anti-interference method based on phased array antenna, characterized in that: For a millimeter wave broadband phased array antenna, the method comprises the following steps: S1: The baseband processor obtains the geographical location information and attitude information of the current system through the positioning system, calculates the beam angle of the phased array antenna based on the acquired geographical location information and attitude information, and communicates with the communication target; S2: The millimeter-wave broadband phased array antenna is divided into multiple receiving sub-arrays, which use wide beams to scan interference source targets in the coverage space, obtain multiple sets of target position data, and form multiple sets of position matrices; S3: Draw target coordinate distribution maps for multiple sets of position matrices through the baseband processor, and perform overlapping analysis on the target coordinate distribution maps to screen out the real interference source targets; S4: For the real interference source target screened out, the baseband processor controls the broadband phased array antenna to form a difference beam, and uses the difference beam to accurately locate the real interference source target, determine its accurate coordinates and obtain the interference source position; S5: Anti-interference processing is performed on the location of the interference source, and narrow beam mode is used for communication. At the same time, zeroing is performed on the location of the real interference source in the phased array pattern to achieve system anti-interference.

2. The anti-interference method based on phased array antenna according to claim 1, characterized in that: The S1 specifically comprises the following steps: After the millimeter-wave broadband phased array antenna is turned on, the baseband processor autonomously queries the current geographical location information and attitude information in real time, and then calculates the theoretical direction of the millimeter-wave broadband phased array antenna according to the geographical location of the communication target input by the user. At this time, the azimuth angle As and elevation angle Es of the millimeter-wave broadband phased array antenna are calculated as follows: ； where ∆φ=φ g -φ s , φs is the longitude of the communication target, λs is the latitude of the communication target, hs is the height of the communication target from the ground, R is the radius of the earth, φg is the longitude of the location of the millimeter-wave broadband phased array antenna, λg is the latitude of the location of the millimeter-wave broadband phased array antenna, and hg is the altitude of the location of the millimeter-wave broadband phased array antenna; Then, based on the real-time attitude data collected by the inertial navigation, the real-time pointing of the millimeter-wave broadband phased array antenna is calculated, and then the beam pointing is corrected in real time, so that the millimeter-wave broadband phased array antenna can dynamically communicate with the communication target. The real-time pointing calculation formula of the millimeter-wave broadband phased array antenna is as follows: ； Among them A G is the azimuth of the communication target, E G is the pitch angle of the communication target, H is the heading angle of the millimeter-wave broadband phased array antenna attitude, P is the pitch angle of the millimeter-wave broadband phased array antenna attitude, R G is the roll angle of the millimeter wave broadband phased array antenna attitude, A b is the azimuth angle in the coordinate system of the millimeter wave broadband phased array antenna, E b is the elevation angle in the coordinate system of the millimeter-wave broadband phased array antenna; the real-time pointing direction of the millimeter-wave broadband phased array antenna is converted into antenna coordinates, that is, the off-axis angle θ = 90–E b ; Azimuth φ = 180 – A b .

3. The anti-interference method based on phased array antenna according to claim 1, characterized in that: The S2 specifically comprises the following steps: The baseband processor sends instructions to make the millimeter-wave broadband phased array antenna work in the interference identification mode. The internal processor of the phased array antenna automatically enters the multi-beam receiving working mode, and divides the entire array surface into multiple output areas. Each output area outputs an independent receiving beam. Each receiving beam scans the same airspace, receives the interference signal in the airspace, records the spatial coordinate position and signal strength of each interference signal, and forms an interference source position matrix. The interference source position matrix is ​​as follows: ； in Xn , Y , Zn The X-axis coordinate, Y-axis coordinate and Z-axis coordinate of the interference source in three-dimensional space together constitute the spatial coordinate position of the interference source. Pn is the signal strength of the corresponding interference source, n is the number of interference sources, and m is the number of position matrices; each receiving beam in each quadrant will output a position matrix, so the millimeter-wave broadband phased array antenna has a total of multiple interference source position matrices at the same time.

4. The anti-interference method based on phased array antenna according to claim 1, characterized in that: The S3 specifically comprises the following steps: The baseband processor processes data of multiple groups of position matrices obtained at the same time, analyzes the matrix data to redraw the interference source target coordinate distribution map, and then overlaps and analyzes the multiple interference source target coordinate distribution maps to form a target coordinate distribution map, marks the positions with records in the position matrix within the first preset numerical range in the target coordinate distribution map as real interference source targets, marks the positions with records in the position matrix within the second preset numerical range in the target coordinate distribution map as suspicious interference source targets, and marks the positions without overlap in the target coordinate distribution map as false interference source targets; then processes the analysis results, records the information of the suspicious interference source targets and the real interference source targets, and discards the information of the false interference source targets; the minimum value of the first preset numerical range is greater than the maximum value of the second preset numerical range.

5. The anti-interference method based on phased array antenna according to claim 1, characterized in that: The S4 specifically comprises the following steps: After obtaining the basic information of the real interference source target, it will be accurately positioned. The baseband processor will issue precise positioning instructions, and the internal processor of the millimeter-wave broadband phased array antenna will control the millimeter-wave broadband phased array antenna to form a two-dimensional difference beam, and then perform beam scanning at the coordinate position of the real interference source target to obtain the exact coordinate position of the real interference source target, and feed it back to the baseband processor to obtain the interference source position.

6. The anti-interference method based on phased array antenna according to claim 5, characterized in that: When executing S4, the millimeter wave broadband phased array antenna is set to a cyclic execution interference identification mode.

7. The anti-interference method based on phased array antenna according to claim 1, characterized in that: The S5 specifically comprises the following steps: After the baseband processor obtains the location of the interference source, it analyzes the beam pointing required for the current communication, processes the real interference source, and issues instructions to make the millimeter-wave broadband phased array antenna work in the communication working mode. The millimeter-wave broadband phased array antenna forms a narrow beam to communicate with the communication target. The phased array antenna real-time decay algorithm is used to zero the directional diagram of the millimeter-wave broadband phased array antenna at this time, so that the real interference source signal has a level difference greater than the preset level difference when transmitted to the millimeter-wave broadband phased array antenna aperture, thereby avoiding interference of the real interference source to the millimeter-wave broadband phased array antenna.

8. The anti-interference method based on phased array antenna according to claim 7, characterized in that: The phased array antenna real-time decay algorithm is obtained by combining a genetic algorithm with a phased array antenna algorithm.

9. The anti-interference method based on phased array antenna according to claim 7, characterized in that: The phased array antenna real-time decay algorithm comprises the following steps: Initialize phased array antenna parameters; Set the decay optimization target according to the position information and attitude information of the real interference source target; Plot theoretical radiation patterns of phased array antennas; The genetic algorithm is called to iterate and obtain the optimal withering result by weighting the phase of the phased array antenna; Substitute the optimal withering result to draw the withering pattern of the phased array antenna.

10. The anti-interference method based on phased array antenna according to claim 9, characterized in that: The genetic algorithm comprises the following steps: Initialize the population; Calculate fitness for the first time; perform selection operation; perform crossover operation; perform mutation operation; generate a new population; Calculate the fitness again; Determine whether the termination condition is met. If so, obtain the optimal solution. If not, re-execute the selection operation and subsequent steps until the termination condition is met.

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