An anti-interference method based on a phased array antenna

Abstract

The application 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, performing phased array antenna beam angle calculation according to acquired geographic position information and attitude information, and communicating with a communication target; S2, performing interference source target scanning on a covered space domain, respectively obtaining multiple groups of target position data, and forming multiple groups of position matrices; S3, screening out real interference source targets; S4, performing accurate positioning on the real interference source targets by using difference beams, determining accurate coordinates of the real interference source targets, and obtaining interference source positions; and S5, performing anti-interference processing on the interference source positions, performing communication by using a narrow beam mode, and performing zero adjustment processing on positions of the real interference source targets in a phased array directional diagram, so that system anti-interference is realized. The application reduces the communication influence of interference signals on the phased array antenna, greatly improves the anti-interference performance of the phased array antenna, and ensures the communication reliability of the phased array antenna.

Description

Technical Field

[0001] This invention relates to the field of phased array antenna technology, and in particular to an anti-interference method based on a phased array antenna. Background Technology

[0002] With the rapid iteration of wireless communication technology, millimeter-wave communication is also being updated and upgraded at a rapid pace. Millimeter-wave phased array antenna technology is gradually highlighting its position in the field of millimeter-wave communication, and targeted communication countermeasures are also emerging.

[0003] Communication jamming targets communication receiving systems, aiming to weaken and disrupt their signal sensing and information transmission capabilities. Effective jamming requires sending a jamming signal to the receiver simultaneously with the communication signal, obscuring or interfering with the enemy signal, thus preventing the receiving system from correctly identifying the information. Common anti-jamming methods for receiving systems include adding shielding materials such as frequency-selective surfaces, employing techniques such as automatic frequency hopping and spread spectrum, and using complex adaptive anti-jamming algorithms. These methods are difficult to implement, require additional hardware, and result in high overall system costs. Summary of the Invention

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

[0005] The objective of this invention is achieved through the following technical solution: an anti-interference method based on a phased array antenna for millimeter-wave broadband phased array antennas, comprising the following steps:

[0006] S1: The baseband processor obtains the current geographical location and attitude information of the system through the positioning system, calculates the beam angle of the phased array antenna based on the obtained geographical location and attitude information, and communicates with the communication target.

[0007] S2: The array surface of the millimeter-wave broadband phased array antenna is divided into multiple receiving subarrays. Wide beams are used to scan the covered airspace for interference source targets, and multiple sets of target position data are obtained to form multiple position matrices.

[0008] S3: The baseband processor draws target coordinate distribution maps of multiple position matrices and performs overlap analysis on the target coordinate distribution maps to screen out the real interference source targets;

[0009] S4: For the selected real interference source targets, the baseband processor controls the broadband phased array antenna to form a difference beam. The difference beam is used to accurately locate the real interference source targets and determine their accurate coordinates to obtain the location of the interference source.

[0010] S5: Anti-interference processing is performed on the location of the interference source. Narrow beam mode is used for communication, and the location of the actual interference source in the phased array pattern is zeroed to achieve system anti-interference.

[0011] Preferably, S1 specifically includes the following steps:

[0012] After the millimeter-wave broadband phased array antenna is powered on, the baseband processor autonomously queries the current geographical location and attitude information in real time. Then, based on the geographical location of the communication target input by the user, it calculates the theoretical pointing of the millimeter-wave broadband phased array antenna. At this time, the azimuth angle As and elevation angle Es of the millimeter-wave broadband phased array antenna are calculated using the following formulas:

[0013] ;

[0014] in =φg-φs, where φs is the longitude of the communication target, λs is the latitude of the communication target, hs is the height of the communication target above the ground, R is the Earth's radius, 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.

[0015] Based on the real-time attitude data acquired by the inertial navigation system, the real-time pointing of the millimeter-wave broadband phased array antenna is calculated, and the beam pointing is then corrected in real time, enabling the millimeter-wave broadband phased array antenna to dynamically communicate with the communication target. The formula for calculating the real-time pointing of the millimeter-wave broadband phased array antenna is as follows:

[0016] ;

[0017] Where A G E represents the azimuth angle of the communication target. G H is the elevation angle of the communication target, H is the heading angle of the millimeter-wave broadband phased array antenna, P is the elevation angle of the millimeter-wave broadband phased array antenna, and R is the pitch angle of the communication target. G A represents the roll angle of the millimeter-wave broadband phased array antenna attitude. b E represents the azimuth angle in the coordinate system of the millimeter-wave broadband phased array antenna. b The elevation angle is given in the coordinate system of the millimeter-wave broadband phased array antenna's location; the real-time pointing of the millimeter-wave broadband phased array antenna is converted into antenna coordinates, i.e., the off-axis angle θ = 90–E. b ; Azimuth φ = 180–A b .

[0018] Preferably, S2 specifically includes the following steps:

[0019] The baseband processor issues commands to put the millimeter-wave broadband phased array antenna into interference identification mode. The internal processor of the phased array antenna automatically enters multi-beam receiving mode, dividing the entire array into multiple output areas. Each output area outputs an independent receiving beam, and each receiving beam scans the same spatial domain, receiving interference signals within the spatial domain. The spatial coordinates and signal strength of each interference signal are recorded, forming an interference source location matrix. The interference source location matrix is ​​as follows:

[0020] ;

[0021] in Xn , Yn , Zn The X-axis, Y-axis, and Z-axis coordinates of the interference source in three-dimensional space together constitute the spatial coordinate position of the interference source. Pn The signal strength corresponding to the interference source, n Let m be the number of interference sources and m be the number of position matrices. Each quadrant's receiving beam will output a position matrix, so at the same time, the millimeter-wave broadband phased array antenna has multiple position matrices of interference sources.

[0022] Preferably, S3 specifically includes the following steps:

[0023] The baseband processor processes multiple sets of position matrices obtained at the same time, parses the matrix data to redraw the coordinate distribution map of the interference source targets, and then performs overlay analysis on multiple interference source target coordinate distribution maps to form a target coordinate distribution map. Positions in the target coordinate distribution map where the position matrix records all positions within a first preset numerical range are marked as real interference source targets; positions in the target coordinate distribution map where the position matrix records all positions within a second preset numerical range are marked as suspected interference source targets; and positions in the target coordinate distribution map where there is no overlap are marked as false interference source targets. The analysis results are then processed, recording the information of suspected and real interference source targets, and discarding the information of 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.

[0024] Preferably, S4 specifically includes the following steps:

[0025] After obtaining the basic information of the real interference source target, it will be accurately located. The baseband processor issues an accurate positioning command, 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 differential beam. Then, the beam is scanned at the coordinate position of the real interference source target to obtain the exact coordinate position of the real interference source target, and the feedback is sent to the baseband processor to obtain the location of the interference source.

[0026] Preferably, when executing S4, the millimeter-wave broadband phased array antenna is set to cyclically execute the interference identification mode.

[0027] Preferably, S5 specifically includes the following steps:

[0028] After obtaining the location of the interference source, the baseband processor analyzes the beam direction required for current communication and processes the actual interference source. It then issues a command to put the millimeter-wave broadband phased array antenna into communication mode. The millimeter-wave broadband phased array antenna forms a narrow beam to communicate with the target. A real-time nulling algorithm for the phased array antenna is used to nullify the radiation pattern of the millimeter-wave broadband phased array antenna at this time, so that when the signal from the actual interference source is transmitted to the aperture of the millimeter-wave broadband phased array antenna, there is a level difference greater than a preset level difference, thus avoiding interference from the actual interference source to the millimeter-wave broadband phased array antenna.

[0029] Preferably, the real-time nulling algorithm for the phased array antenna is obtained by combining a genetic algorithm with a phased array antenna algorithm.

[0030] Preferably, the real-time nulling algorithm for the phased array antenna includes the following steps:

[0031] Initialize the phased array antenna parameters;

[0032] Set the withering optimization target based on the location and attitude information of the actual interference source target;

[0033] Draw the theoretical radiation pattern of the phased array antenna;

[0034] The genetic algorithm is invoked to iteratively obtain the optimal decay result by weighting the phase of the phased array antenna;

[0035] Substitute the optimal decay results to plot the decay pattern of the phased array antenna.

[0036] Preferably, the genetic algorithm includes the following steps:

[0037] Initialize the population; calculate fitness for the first time; perform selection; perform crossover; perform mutation; generate a new population; calculate fitness again;

[0038] Determine if the termination condition is met. If it is, obtain the optimal solution. If not, re-execute the selection operation and subsequent steps until the termination condition is met.

[0039] Preferably, there are four receiving subarrays, four sets of target position data, and four sets of position matrices.

[0040] The beneficial effects of this invention are:

[0041] 1) Based on the characteristics and algorithms of phased array antennas, this invention reduces the impact of interference signals on the communication of phased array antennas, greatly improves the anti-interference capability of phased array antennas, and ensures the communication reliability of phased array antennas; the implementation method is simple, requires no additional hardware costs, and has a high cost-performance ratio. Attached Figure Description

[0042] Figure 1 The flowchart shows the anti-interference method based on phased array antennas.

[0043] Figure 2 This is a map showing the coordinate distribution of the interference source targets.

[0044] Figure 3 Flowchart of the real-time nulling algorithm for phased array antennas;

[0045] Figure 4 This is a schematic diagram of the pattern decay of a phased array antenna.

[0046] Figure 5 This is a convergence graph of the phased array antenna genetic algorithm's decay. Detailed Implementation

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] See Figures 1-5 The first aspect of this invention provides: an anti-interference method based on a phased array antenna for a millimeter-wave broadband phased array antenna, comprising the following steps:

[0049] S1: The baseband processor obtains the current geographical location and attitude information of the system through the positioning system, calculates the beam angle of the phased array antenna based on the obtained geographical location and attitude information, and communicates with the communication target.

[0050] S2: The array surface of the millimeter-wave broadband phased array antenna is divided into multiple receiving subarrays. Wide beams are used to scan the covered airspace for interference source targets, and multiple sets of target position data are obtained to form multiple position matrices.

[0051] S3: The baseband processor draws target coordinate distribution maps of multiple position matrices and performs overlap analysis on the target coordinate distribution maps to screen out the real interference source targets;

[0052] S4: For the selected real interference source targets, the baseband processor controls the broadband phased array antenna to form a difference beam. The difference beam is used to accurately locate the real interference source targets and determine their accurate coordinates to obtain the location of the interference source.

[0053] S5: Anti-interference processing is performed on the location of the interference source. Narrow beam mode is used for communication, and the location of the actual interference source in the phased array pattern is zeroed to achieve system anti-interference.

[0054] In this embodiment, the number of receiving subarrays can be set according to the actual working environment and needs; the number of receiving subarrays determines the number of sets of target position data and position matrices obtained. In a preferred embodiment, four receiving subarrays are set, which can divide the scanning spatial domain into four quadrants.

[0055] In some embodiments, S1 specifically includes the following steps:

[0056] After the millimeter-wave broadband phased array antenna is powered on, the baseband processor autonomously queries the current geographical location and attitude information in real time. Then, based on the geographical location of the communication target input by the user, it calculates the theoretical pointing of the millimeter-wave broadband phased array antenna. At this time, the azimuth angle As and elevation angle Es of the millimeter-wave broadband phased array antenna are calculated using the following formulas:

[0057] ;

[0058] in =φg-φs, where φs is the longitude of the communication target, λs is the latitude of the communication target, hs is the height of the communication target above the ground, R is the Earth's radius, 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.

[0059] Based on the real-time attitude data acquired by the inertial navigation system, the real-time pointing of the millimeter-wave broadband phased array antenna is calculated, and the beam pointing is then corrected in real time, enabling the millimeter-wave broadband phased array antenna to dynamically communicate with the communication target. The formula for calculating the real-time pointing of the millimeter-wave broadband phased array antenna is as follows:

[0060] ;

[0061] Where A G E represents the azimuth angle of the communication target. G H is the elevation angle of the communication target, H is the heading angle of the millimeter-wave broadband phased array antenna, P is the elevation angle of the millimeter-wave broadband phased array antenna, and R is the pitch angle of the communication target. G A represents the roll angle of the millimeter-wave broadband phased array antenna attitude. b E represents the azimuth angle in the coordinate system of the millimeter-wave broadband phased array antenna.b The elevation angle is given in the coordinate system of the millimeter-wave broadband phased array antenna's location; the real-time pointing of the millimeter-wave broadband phased array antenna is converted into antenna coordinates, i.e., the off-axis angle θ = 90–E. b ; Azimuth φ = 180–A b .

[0062] In this embodiment, after the millimeter-wave broadband phased array antenna is powered on, the baseband processor autonomously queries the current geographical location information and attitude information in real time, and then calculates the theoretical pointing of the phased array antenna based on the geographical location of the communication target input by the user.

[0063] In some embodiments, S2 specifically includes the following steps:

[0064] The baseband processor issues commands to put the millimeter-wave broadband phased array antenna into interference identification mode. The internal processor of the phased array antenna automatically enters multi-beam receiving mode, dividing the entire array into multiple output areas. Each output area outputs an independent receiving beam, and each receiving beam scans the same spatial domain, receiving interference signals within the spatial domain. The spatial coordinates and signal strength of each interference signal are recorded, forming an interference source location matrix. The interference source location matrix is ​​as follows:

[0065] ;

[0066] in Xn , Yn , Zn The X-axis, Y-axis, and Z-axis coordinates of the interference source in three-dimensional space together constitute the spatial coordinate position of the interference source. Pn The signal strength corresponding to the interference source, n Let m be the number of interference sources and m be the number of position matrices. Each quadrant's receiving beam will output a position matrix, so at the same time, the millimeter-wave broadband phased array antenna has multiple position matrices of interference sources.

[0067] In this embodiment, after the millimeter-wave broadband phased array antenna completes system positioning and obtains the required geographic coordinates and attitude information, it performs interference source investigation. The baseband processor issues instructions to make the phased array antenna work in interference identification mode. The internal processor of the phased array antenna automatically enters the multi-beam receiving working mode, divides the entire array surface into four quadrants, and outputs an independent receiving beam in each quadrant. Each beam scans the same spatial domain, receives interference signals in the spatial domain, records the spatial coordinate position and signal strength of each interference signal, and forms an interference source position matrix.

[0068] In some embodiments, S3 specifically includes the following steps:

[0069] The baseband processor processes multiple sets of position matrices obtained at the same time, parses the matrix data to redraw the coordinate distribution map of the interference source targets, and then performs overlay analysis on multiple interference source target coordinate distribution maps to form a target coordinate distribution map. Positions in the target coordinate distribution map where the position matrix records all positions within a first preset numerical range are marked as real interference source targets; positions in the target coordinate distribution map where the position matrix records all positions within a second preset numerical range are marked as suspected interference source targets; and positions in the target coordinate distribution map where there is no overlap are marked as false interference source targets. The analysis results are then processed, recording the information of suspected and real interference source targets, and discarding the information of 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.

[0070] In this embodiment, the first preset numerical range and the second preset numerical range are values ​​or ranges preset according to the actual working environment and working needs, and are not limited to a specific value or range. It is sufficient that the minimum value of the first preset numerical range is greater than the maximum value of the second preset numerical range. When there are four receiving subarrays, the first preset numerical range is 4, and the second preset range is 2-3. In a preferred embodiment, after obtaining four sets of interference source position matrices, the baseband processor processes the data of these four sets of position matrices obtained at the same time, parses the matrix data to redraw the interference source target coordinate distribution map, and then performs overlay analysis on the four interference source target coordinate distribution maps to form a phased array antenna interference source target coordinate distribution map (see...). Figure 2 The locations where all four position matrices in the target coordinate distribution map are recorded are marked as true interference source targets; the locations where two or three position matrices in the target coordinate distribution map are recorded as suspected interference source targets; and the locations where there is no overlap in the target coordinate distribution map are marked as false interference source targets. The analysis results are then processed to record the information of suspected interference source targets and true interference source targets, while discarding false interference source targets.

[0071] In some embodiments, S4 specifically includes the following steps:

[0072] After obtaining the basic information of the real interference source target, it will be accurately located. The baseband processor issues an accurate positioning command, 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 differential beam. Then, the beam is scanned at the coordinate position of the real interference source target to obtain the exact coordinate position of the real interference source target, and the feedback is sent to the baseband processor to obtain the location of the interference source.

[0073] In this embodiment, after obtaining the basic information of the interference source target, it will be accurately located. The baseband processor issues an accurate positioning command, and the internal processor of the phased array antenna controls the phased array antenna to form a two-dimensional differential beam. Then, a fast and accurate beam scan is performed at the obtained coordinate position of the interference source target to obtain the exact coordinate position of the interference source target and feed 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 cyclically execute the interference identification mode.

[0074] In some embodiments, when performing S4, the millimeter-wave broadband phased array antenna is set to cyclically execute the interference identification mode.

[0075] In some embodiments, S5 specifically includes the following steps:

[0076] After obtaining the location of the interference source, the baseband processor analyzes the beam direction required for current communication and processes the actual interference source. It then issues a command to put the millimeter-wave broadband phased array antenna into communication mode. The millimeter-wave broadband phased array antenna forms a narrow beam to communicate with the target. A real-time nulling algorithm for the phased array antenna is used to nullify the radiation pattern of the millimeter-wave broadband phased array antenna at this time, so that when the signal from the actual interference source is transmitted to the aperture of the millimeter-wave broadband phased array antenna, there is a level difference greater than a preset level difference, thus avoiding interference from the actual interference source to the millimeter-wave broadband phased array antenna.

[0077] In this embodiment, after the baseband processor obtains the location of the interference source, it analyzes the beam direction required for the current communication, processes the interference source, and issues a command to make the phased array antenna work in the communication mode. The phased array antenna forms a narrow beam to communicate with the target. At the same time, a genetic algorithm is used to zero-adjust the radiation pattern of the phased array antenna at this time, so that the interference source signal has a large level difference when it is transmitted to the phased array antenna aperture, thus avoiding interference from the interference source to the phased array antenna.

[0078] In some embodiments, the phased array antenna real-time nulling algorithm is obtained by combining a genetic algorithm with a phased array antenna algorithm.

[0079] In this embodiment, the genetic algorithm is an optimization method that simulates natural selection and genetic mechanisms. It searches for solutions to a problem by simulating the evolutionary process of organisms. During the solution process, starting from any initial population, random selection, crossover, and mutation operations are used to generate a group of individuals better suited to the environment. This evolution continues generation after generation until the optimal solution is found. The genetic algorithm is the most commonly used and mature algorithm. By combining the genetic algorithm with a phased array antenna algorithm, a real-time nulling algorithm for phased array antennas can be derived. The flow of the real-time nulling algorithm for phased array antennas is as follows: Figure 3 As shown.

[0080] In some embodiments, the phased array antenna real-time nulling algorithm includes the following steps:

[0081] Initialize the phased array antenna parameters;

[0082] Set the withering optimization target based on the location and attitude information of the actual interference source target;

[0083] Draw the theoretical radiation pattern of the phased array antenna;

[0084] The genetic algorithm is invoked to iteratively obtain the optimal decay result by weighting the phase of the phased array antenna;

[0085] Substitute the optimal decay results to plot the decay pattern of the phased array antenna.

[0086] In this embodiment, the algorithm first initializes the phased array antenna parameters, then sets the nulling optimization target based on the interference source target position and attitude information, then draws the theoretical radiation pattern of the phased array antenna, and then calls the genetic algorithm to quickly iterate and obtain the optimal nulling result by weighting the phase of the phased array antenna. The convergence process of the genetic algorithm for nulling is as follows: Figure 5 As shown, the nulling results are then substituted to plot the nulling pattern of the phased array antenna. The patterns before and after nulling are compared based on the real-time nulling algorithm results for the phased array antenna, as shown below. Figure 4 As shown, the sidelobe level at the interference source location (M1) in the radiation pattern before nulling is -20.1461dB, and the sidelobe level at the interference source location (M2) in the radiation pattern after nulling is -36.909dB. After nulling, the phased array antenna's suppression of interference sources increases by 16.7629dB, reducing the impact of interference signals on the phased array antenna's communication, greatly improving the phased array antenna's anti-interference capability, and ensuring the phased array antenna's communication reliability.

[0087] In some embodiments, the genetic algorithm includes the following steps:

[0088] Initialize the population; calculate fitness for the first time; perform selection; perform crossover; perform mutation; generate a new population; calculate fitness again;

[0089] Determine if the termination condition is met. If it is, obtain the optimal solution. If not, re-execute the selection operation and subsequent steps until the termination condition is met.

[0090] In some embodiments, there are four receiving subarrays, four sets of target position data, and four sets of position matrices.

[0091] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for interference rejection based on a phased array antenna, characterized in that: For millimeter wave broadband phased array antenna, comprising the following steps: S1: the baseband processor obtains the current system geographic location information and attitude information through the positioning system, and calculates the phased array antenna beam angle according to the obtained geographic 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 subarrays, and a wide beam is used to scan the interference source target in the covered space domain respectively, and multiple sets of target position data are obtained respectively to form multiple sets of position matrices; S3: the baseband processor draws a target coordinate distribution map for the multiple sets of position matrices, and performs overlap analysis on the target coordinate distribution map to screen out the real interference source target; S4: for the screened real interference source target, the baseband processor controls the broadband phased array antenna to form a difference beam, and uses the difference beam to accurately position the real interference source target to determine its accurate coordinates to obtain the interference source position; S5: for the interference source position, anti-interference processing is carried out, narrow beam mode is used for communication, and zero adjustment is carried out on the position of the real interference source in the phased array directional diagram to realize system anti-interference.

2. The phased array antenna based anti-jamming method of claim 1, wherein: The S1 specifically comprises the following steps: After the millimeter wave broadband phased array antenna is started, the baseband processor autonomously and in real time queries the current geographic location information and attitude information, and then calculates the theoretical pointing direction of the millimeter wave broadband phased array antenna according to the geographic location of the communication target input by the user, at this time the azimuth angle As and the elevation angle Es of the millimeter wave broadband phased array antenna, the calculation formula is as follows: ； wherein = φg- φs, 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. According to the real-time attitude data collected by the inertial navigation, the real-time pointing direction of the millimeter wave broadband phased array antenna is calculated, and the beam pointing direction is corrected in real time, so that the millimeter wave broadband phased array antenna dynamically communicates with the communication target, and the real-time pointing direction calculation formula of the millimeter wave broadband phased array antenna is as follows: ； wherein A G is an azimuth angle of the communication target, E G is an elevation angle of the communication target, H is a heading angle of the attitude of the millimeter wave broadband phased array antenna, P is an elevation angle of the attitude of the millimeter wave broadband phased array antenna, R G is a roll angle of the attitude of the millimeter wave broadband phased array antenna, A b is an azimuth angle in a coordinate system of a position where the millimeter wave broadband phased array antenna is located, E b is an elevation angle in the coordinate system of the position where the millimeter wave broadband phased array antenna is located; the real-time pointing of the millimeter wave broadband phased array antenna is converted into an antenna coordinate, that is, an off-axis angle θ = 90 - E b ; an azimuth angle φ = 180 - A b .

3. The phased array antenna based anti-jamming method of claim 1, wherein: The S2 specifically comprises the following steps: The baseband processor issues an instruction to make the millimeter wave broadband phased array antenna work in the interference identification mode, and the internal processor of the phased array antenna automatically enters the multi-beam receiving working mode, divides the entire array surface into multiple output regions, and outputs an independent receiving beam for each output region. Each receiving beam scans the same space domain, receives the interference signal in the space domain, records the spatial coordinate position and signal strength of each interference signal, and forms an interference source position matrix, which is as follows: ； wherein Xn , Yn , Zn are respectively the X-axis coordinate, the Y-axis coordinate and the Z-axis coordinate of the interference source in the three-dimensional space, which jointly constitute 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 of each quadrant outputs a position matrix, so that the millimeter wave broadband phased array antenna has multiple position matrices of interference sources at the same time.

4. The phased array antenna based anti-jamming method of claim 1, wherein: The S3 specifically comprises the following steps: The baseband processor processes multiple sets of position matrices obtained at the same time, parses the matrix data to redraw the coordinate distribution map of the interference source targets, and then performs overlay analysis on multiple interference source target coordinate distribution maps to form a target coordinate distribution map. Positions in the target coordinate distribution map where the position matrix records all positions within a first preset numerical range are marked as real interference source targets; positions in the target coordinate distribution map where the position matrix records all positions within a second preset numerical range are marked as suspected interference source targets; and positions in the target coordinate distribution map where there is no overlap are marked as false interference source targets. The analysis results are then processed, recording the information of suspected and real interference source targets, and discarding the information of 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 phased array antenna based anti-jamming method of claim 1, wherein: The S4 specifically includes the following steps: After obtaining the basic information of the real interference source target, it will be accurately located. The baseband processor issues an accurate positioning command, 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 differential beam. Then, the beam is scanned at the coordinate position of the real interference source target to obtain the exact coordinate position of the real interference source target, and the feedback is sent to the baseband processor to obtain the location of the interference source.

6. The phased array antenna based anti-jamming method of claim 5, wherein: When executing S4, the millimeter-wave broadband phased array antenna is set to cyclically execute the interference identification mode.

7. The phased array antenna based anti-jamming method of claim 1, wherein: The S5 specifically includes the following steps: After obtaining the location of the interference source, the baseband processor analyzes the beam direction required for current communication and processes the actual interference source. It then issues a command to put the millimeter-wave broadband phased array antenna into communication mode. The millimeter-wave broadband phased array antenna forms a narrow beam to communicate with the target. A real-time nulling algorithm for the phased array antenna is used to nullify the radiation pattern of the millimeter-wave broadband phased array antenna at this time, so that when the signal from the actual interference source is transmitted to the aperture of the millimeter-wave broadband phased array antenna, there is a level difference greater than a preset level difference, thus avoiding interference from the actual interference source to the millimeter-wave broadband phased array antenna.

8. The phased array antenna based anti-jamming method of claim 7, wherein: The real-time nulling algorithm for phased array antennas is obtained by combining genetic algorithm and phased array antenna algorithm.

9. The phased array antenna based anti-jamming method of claim 7, wherein: The real-time nulling algorithm for phased array antennas includes the following steps: Initialize the phased array antenna parameters; Set the withering optimization target based on the location and attitude information of the actual interference source target; Draw the theoretical radiation pattern of the phased array antenna; The genetic algorithm is invoked to iteratively obtain the optimal decay result by weighting the phase of the phased array antenna; Substitute the optimal decay results to plot the decay pattern of the phased array antenna.

10. The phased array antenna based anti-jamming method of claim 9, wherein: The genetic algorithm includes the following steps: Initialize the population; First, calculate fitness; perform selection; perform crossover; perform mutation; generate a new population. Calculate fitness again; Determine if the termination condition is met. If it is, obtain the optimal solution. If not, re-execute the selection operation and subsequent steps until the termination condition is met.

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