Phased array radar system multi-domain joint interference suppression method

Abstract

A multi-domain joint interference suppression method for a phased array radar system comprises the following steps: (1) detecting and receiving an interference signal, and obtaining interference source characteristics: an incoming wave direction, an interference frequency and an interference waveform; (2) radar working parameters are set according to the principle of being staggered from interference source signal parameters to the maximum extent, radar emission is turned off after short-time starting and working, interference signals are detected and received again, and the incoming wave direction, the interference frequency and the interference waveform of the interference source are obtained again; (3) judging whether the interference incoming wave direction is located in a radar coverage extension area or not and whether the interference frequency and the interference waveform keep dynamic following with the working frequency and the emission waveform of a radar system or not based on the two detected data; and (4) setting radar working parameters according to the determined frequency working mechanism, waveform working mechanism and directional diagram mode, and starting up radar emission to implement detection work. According to the invention, the anti-interference is realized in a multi-domain composite interference suppression mode by using the resources and the degree of freedom of the radar in the antenna domain, the frequency domain and the waveform domain.

Description

Technical Field

[0001] The present invention relates to a multi-domain joint interference suppression method for a phased array radar system, belonging to the technical field of radar anti-jamming technology. Background Art

[0002] Radar is an important technical means for target detection and threat warning. It operates in the microwave band and can detect and warn all day and all weather, and has great application potential in both military and civilian fields. The phased array radar system is equipped with a phased array antenna. Compared with the radar system equipped with traditional antennas such as reflector antennas, its beam scanning does not require physical rotation of the antenna, and only needs to be controlled by an electrical signal to achieve, which is convenient for realizing the tracking and detection of dynamic targets. And different pattern performances can be obtained through the amplitude-phase control of many channels, and the beam control is relatively flexible, which is convenient for realizing beam shaping and adaptive interference suppression. The phased array radar system has obvious technical advantages and broad application prospects.

[0003] In view of the huge role of the phased array radar system, the research on its interference technology has become an important topic in the field of military information confrontation. In order to contain the role of the opponent's radar system in military reconnaissance, the interference technology against the radar system is currently being studied. The common interference method is to suppress the power or simulate false targets, so that the other party's radar system cannot effectively detect or be deceived by false targets. In short, it is to make the other party's radar system unable to obtain correct information or obtain wrong information.

[0004] The emergence of radar interference has also promoted the development of interference suppression technology. As the opposite of interference, radar interference suppression is a series of measures taken to ensure its effective operation in an electronic interference environment, aiming to eliminate or weaken the influence of interference and ensure the effective operation of the radar system in an interference environment. The phased array radar system can take interference suppression measures from dimensions such as the antenna domain, frequency domain, and waveform domain by virtue of its high degree of freedom advantage. The current radar interference suppression methods mostly implement measures in a single domain and lack the ability to effectively deal with multiple types of interference. For example, only anti-jamming processing is carried out in the frequency domain, which can produce a better suppression effect on fixed-frequency interference, but it is difficult to effectively suppress frequency-following interference. In other words, the current interference suppression methods do not fully utilize the multi-dimensional degrees of freedom of the phased array radar system. On the one hand, it is difficult to "prescribe the right medicine" for different types of interference sources for precise suppression; on the other hand, in the face of complex interference, the "compound" anti-jamming effect of multi-domain combination cannot be achieved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: overcoming the deficiencies of the prior art, providing a multi-domain joint interference suppression method for a phased array radar system, which can make full use of the resources and degrees of freedom of the radar system in dimensions such as the antenna domain, frequency domain, and waveform domain, and through a multi-domain composite interference suppression method, achieve an anti-jamming effect superior to that of traditional single-dimensional methods.

[0006] The technical solution of the present invention is:

[0007] In a first aspect, the present invention provides a multi-domain joint interference suppression method for a phased array radar system, comprising the following steps:

[0008] Step 1: Obtain the characteristics of the interference source: detect and receive the interference signal, analyze and process the detected interference signal, and obtain the direction, frequency and waveform of the interference source;

[0009] Step 2: Set the radar working parameters according to the principle of maximum deviation from the interference source signal parameters, and start the radar for a short time; then, turn off the radar transmitter, detect and receive the interference signal again, and analyze and process the detected interference signal again to obtain the incoming wave direction, interference frequency and interference waveform of the interference source again;

[0010] Step 3: Based on the above two detection data, determine whether the interference wave direction is located in the radar coverage extension area, and whether the interference frequency and interference waveform keep dynamic tracking with the working frequency and transmission waveform of the radar system;

[0011] Step 4: beamforming the receiving antenna pattern according to the interference wave direction: if the interference wave direction is within the radar coverage extension area, the interference wave direction is used as the null angle of the antenna pattern to beamform the radar receiving antenna, otherwise, the radar antenna pattern remains unchanged;

[0012] Reset the radar operating frequency according to the interference frequency: If the interference frequency and the radar operating frequency keep dynamic tracking, the radar adopts the frequency hopping working mechanism, otherwise, the radar adopts the fixed frequency working mechanism and keeps the working frequency and the interference frequency at the maximum interval within the system bandwidth;

[0013] Reset the radar radiation waveform according to the interference waveform: if the interference waveform keeps dynamically following the radar working waveform, the radar adopts the waveform agility working mechanism; otherwise, the radar adopts the fixed waveform working mechanism and keeps the working waveform orthogonal to the interference waveform.

[0014] Furthermore, the detecting and receiving of the interference signal is specifically:

[0015] Before radar detection, passive detection is performed, that is, only the radar receiver is turned on, and the radar transmitter is not turned on. Within the radar illumination wave range and the working frequency band, passive detection is performed at each wave position k = 1, 2...K and each frequency point j = 1, 2...J. The detection time of each frequency point in each wave position is t, and the detection data of the kth wave position and the jth frequency point is recorded as S k,j ;

[0016] Among them, the calculation methods for the number of frequency positions \(K\), the number of frequency points \(J\), and the receiving duration \(t\) are as follows:

[0017] Let the elevation scanning range of the radar antenna be \([-\theta,\theta]\), and the azimuth scanning range be \([-\varphi,\varphi]\). The elevation main lobe beamwidth of the radar is \(\delta\theta\), and the azimuth main lobe beamwidth is \(\delta\varphi\). Then the number of frequency positions \(K\) within the antenna illumination range is an integer not less than ;

[0018] Let the available frequency band range of the radar be \([f_1,f_2]\), and the instantaneous working bandwidth be \(B\). Then the number of frequency hopping \(J\) within the radar frequency band range is an integer not less than ;

[0019] Let the radar use \(M\) groups of pulse repetition frequencies to resolve range ambiguities, and the coherent integration time of a single pulse repetition frequency be \(T\) CPI , then the receiving duration \(t\) for each frequency point in each frequency position is \(t = M\cdot T\) CPI .

[0020] Furthermore, based on the data \(S\) received by the radar k,j , analyze whether there is interference and obtain the interference frequency \(f\) I , and the specific method is as follows:

[0021] For each frequency point \(j = 1,2,\cdots,J\) and each frequency position \(k = 1,2,\cdots,K\), let \(P\) k,j be the received power converted based on the received data \(S\) k,j , \(\Delta P\) R be the radar receiver noise power, and \(P\) N0 be the in-band power flatness of the radar receiver. If \(P\) k,j \(\geq\Delta P\) R + \(P\) N0 + 1 dB, it is considered that there is interference at the frequency point \(j\) and the frequency position \(k\), and the frequency point \(j\) at this time is recorded as the interference frequency \(f\) I ;

[0022] If it is determined that there is interference, then obtain the interference waveform \(W\) I information, and the specific method is as follows: At the interference frequency \(f\) I , find the frequency position \(A\) with the largest received amplitude among all \(K\) frequency positions. The parameters at this frequency position \(A\) are the elevation angle \(\theta\) A , the azimuth angle \(\varphi\) A , and the amplitude \(M\) A , and record the received data \(S\) k,j at this time as the interference signal waveform \(W\) I .

[0023] Furthermore, if it is determined that there is interference, then obtain the incoming wave direction of the interference source, that is, the elevation angle \(\theta\) I , the azimuth angle \(\varphi\) I , and the specific method is as follows:

[0024] At the interference frequency point f I Find the beam B with the larger amplitude among two adjacent scanning beams in the elevation direction of the waveform position A, and the parameters are the elevation angle θ B , azimuth angle φ B , and amplitude M B . Find the beam C with the larger amplitude among two adjacent scanning beams in the azimuth direction of the waveform position A, and the parameters are the elevation angle θ C , azimuth angle φ C , and amplitude M C ;

[0025] Define the function f(x) to represent the amplitude value of the elevation antenna pattern of beam A, and the independent variable x represents the angular distance from the elevation direction to θ A ; the function g(y) represents the amplitude value of the azimuth antenna pattern of beam A, and the independent variable y represents the angular distance from the azimuth direction to φ A ; the functions f(x) and g(y) are obtained through the antenna design scheme or the actual measurement results of the antenna;

[0026] Define the sets R EL , R AZ as follows:

[0027] where p = 1, 2,..., 9

[0028] where q = 1, 2,..., 9

[0029] Among the elements of the set R EL , find the p value corresponding to the element that is numerically closest to ; among the elements of the set R AZ , find the q value corresponding to the element that is numerically closest to , then the elevation angle θ I and azimuth angle φ I of the interference incoming wave direction are calculated as follows:

[0030]

[0031] Furthermore, according to the principle of maximizing the stagger of the interference source signal parameters, set the radar operating parameters, specifically:

[0032] The radar transmits and powers on to perform normal detection work. If it is determined that there is interference, the radar operating parameters are set to the operating frequency point f T , transmit waveform W T , and the pointing waveform position parameters are the elevation angle θ T and any azimuth angle φ T , where f TTo obtain the value that is farthest from the interference frequency point f within the frequency band range [f1, f2], W I is the waveform that has the largest distinction from the interference waveform W T , and the elevation angle θ I , azimuth angle φ T are the pointing angles of the mission area. T Furthermore, the radar transmission is turned off, and only the radar reception is turned on. The interference signal is detected again in the manner of Step 1, and the detected interference signal is analyzed and processed again to obtain the interference frequency f

[0033] ' of the interference source, the interference waveform W I ', and the direction of the incoming wave. The parameters of the direction of the incoming wave are the elevation angle θ I ', azimuth angle φ I '. I Furthermore, based on the above two detection data in Step 3, it is determined whether the direction of the interference incoming wave is located in the radar coverage extended area, and whether the interference frequency and interference waveform dynamically follow the operating frequency and transmitted waveform of the radar system. Specifically:

[0034] If the two interference frequencies are different, f

[0035] ≠f I ', and the interference frequency f I ' is the same as the radar operating frequency f I , that is, f T ' = f I , then it is considered that the interference frequency follows the radar operating frequency, and the radar adopts a frequency hopping operating mechanism; otherwise, the radar adopts a fixed frequency operating mechanism, and the operating frequency point is f T ; T If the two interference waveforms are different, W

[0036] ≠W I ', and the interference waveform W I ' is similar to the radar transmitted waveform W I , that is, the correlation coefficient ρ(W T ',W I )≥0.9, then it is considered that the interference waveform follows the radar operating waveform, and the radar adopts a waveform agile operating mechanism; otherwise, the radar adopts a fixed waveform operating mechanism, and the operating waveform is W T . T Furthermore, it is determined whether the interference source with the incoming wave direction of the elevation angle θ

[0037] ', azimuth angle φ I ' is located in the radar coverage extended area. The specific method is as follows: I Assume that the elevation angle range of the radar coverage area is [θ

[0038] ,θ a ,θb , and the azimuth range is [φ a , φ b ; the angular distance between the first sidelobe and the main lobe of the elevation pattern of the radar antenna is Δθ, and the angular distance between the first sidelobe and the main lobe of the azimuth pattern is Δφ;

[0039] If θ I ′ ∈ [θ a - Δθ, θ b + Δθ] and φ I ′ ∈ [φ a - Δφ, φ b + Δφ], it is considered that the direction of the interfering incoming wave is in the radar coverage expansion area, and then beamforming is performed on the radar receiving pattern to achieve a null in the pattern in the direction of the interfering incoming wave; otherwise, the radar antenna pattern remains unchanged.

[0040] In a second aspect, the present invention also proposes a processor, and the processor is used to run a program. Wherein, when the program runs, it executes the multi-domain joint interference suppression method of the phased array radar system described above.

[0041] In a third aspect, the present invention also proposes a computer program product, and when the computer program product is executed by a processor, it implements the multi-domain joint interference suppression method of the phased array radar system described above.

[0042] The beneficial effects of the present invention compared with the prior art are:

[0043] (1) The present invention adopts a multi-domain joint interference suppression design: interference perception and interference suppression are carried out from multiple dimensions such as the antenna domain, frequency domain, and waveform domain, which can make full use of the resources and degrees of freedom of the radar system in dimensions such as the antenna domain, frequency domain, and waveform domain, and achieve an anti-interference effect superior to that of traditional single-dimensional methods.

[0044] (2) The present invention adopts the method of "detecting and receiving interference - turning on the radar - detecting and receiving interference again" to judge whether the interference direction covers the radar detection expansion area, whether the interference frequency follows the radar operating frequency, whether the interference waveform follows the radar operating waveform, etc., and implements targeted interference suppression methods according to the judgment results.

[0045] (3) The present invention proposes a method of fast amplitude comparison, and realizes a relatively accurate estimation of the direction of the interfering incoming wave without requiring additional hardware resources such as a sum-difference network in the radar system. Description of the Drawings

[0046] Figure 1 It is a schematic diagram of the multi-domain joint interference suppression function of the phased array radar system;

[0047] Figure 2This is a block diagram of the multi-domain joint interference suppression technology solution for phased array radar systems. DETAILED DESCRIPTION

[0048] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0049] According to the attached Figure 1 Taking into account the characteristics of antenna domain, frequency domain and waveform domain, the basic idea of ​​the multi-domain joint interference suppression method of the phased array radar system proposed in the present invention can be summarized as follows:

[0050] 1. Detect and receive interference signals, analyze and process the detected interference signals, and obtain the direction, frequency and waveform of the interference source;

[0051] 2. Set the radar working parameters according to the principle of maximally staggering the parameters of the interference source signal, and start the radar for a short time; then, turn off the radar transmission, detect and receive the interference signal again, and analyze and process the detected interference signal again to obtain the direction, frequency and waveform of the interference source again;

[0052] 3. Based on the above detection data, determine whether the interference wave direction is located in the radar coverage extension area, and whether the interference frequency and interference waveform keep dynamic tracking with the operating frequency and transmission waveform of the radar system;

[0053] 4. Perform beamforming on the receiving antenna pattern according to the direction of the interference wave: If the direction of the interference wave is within the radar coverage extension area, the direction of the interference wave is used as the null angle of the antenna pattern to beamform the radar receiving antenna, otherwise, the radar antenna pattern remains unchanged; reset the radar operating frequency according to the interference frequency: If the interference frequency and the radar operating frequency keep dynamic tracking, the radar adopts a frequency hopping working mechanism, otherwise, the radar adopts a fixed frequency working mechanism, and the working frequency and the interference frequency are kept at the maximum interval within the system bandwidth; reset the radar radiation waveform according to the interference waveform: If the interference waveform and the radar working waveform keep dynamic tracking, the radar adopts a waveform agile working mechanism, otherwise, the radar adopts a fixed waveform working mechanism, and the working waveform and the interference waveform are kept orthogonal or significantly distinguished.

[0054] Specifically, Figure 2 As shown, the steps of the multi-domain joint interference suppression method of the phased array radar system proposed by the present invention are as follows:

[0055] Step 1: Before the radar detection operation, passive reception is implemented, that is, only the radar receiver is turned on. In the radar illumination wave position range and the working frequency band range, passive reception is carried out for each wave position (k = 1, 2... K) and each frequency point (j = 1, 2... J) (only the radar receiver is turned on, and the radar transmitter is not turned on). The reception duration for each frequency point in each wave position is t, and the reception data at the k-th wave position and the j-th frequency point is denoted as S k,j .

[0056] Among them, the calculation methods for the number of wave positions K, the number of frequency points J, and the reception duration t are as follows:

[0057] Suppose the elevation scanning range of the radar antenna is [-θ, θ], the azimuth scanning range is [-φ, φ], the elevation main lobe beam width of the radar is δθ, and the azimuth main lobe beam width is δφ. Then the number of wave positions K within the antenna illumination range is an integer not less than .

[0058] Suppose the available working frequency band range of the radar is [f1, f2], and the instantaneous working bandwidth is B. Then the number of frequency hopping J within the radar frequency band range is an integer not less than .

[0059] Suppose the radar uses M groups of pulse repetition frequencies to resolve range ambiguity, and the coherent integration time of a single pulse repetition frequency is T CPI . Then the reception duration for each frequency point in each wave position is t = M·T CPI .

[0060] Step 2: Based on the data S received by the radar k,j , analyze whether there is interference and obtain the interference frequency f I , and the specific method is as follows:

[0061] For each frequency point j (j = 1, 2... J) and each wave position k (k = 1, 2... K), let P k,j be the received power converted based on the received data S k,j , ΔP R be the radar receiver noise power, and P N0 be the in-band power flatness of the radar receiver. If P k,j ≥ΔP R +P N0 +1dB, it is considered that there is interference at "frequency point j, wave position k", and the frequency point j at this time is recorded as the interference frequency f I .

[0062] Step 3: If it is determined in Step 2 that there is interference, then obtain the interference waveform W I information, and the specific method is as follows:

[0063] At the interference frequency f IAt this point, find the wave position A with the largest received amplitude among all K wave positions (elevation angle θ A , azimuth angle φ A , and amplitude M A ), and record the received data S k,j at this time as the interference signal waveform W I .

[0064] Step 4: If it is determined in Step 2 that there is interference, obtain the incoming wave direction of the interference source (elevation angle θ I , azimuth angle φ I ), and the specific method is as follows:

[0065] At the interference frequency point f I , find the beam B with a larger amplitude among the two adjacent scanning beams in the elevation direction of the wave position A (elevation angle θ B , azimuth angle φ B , and amplitude M B ). Find the beam C with a larger amplitude among the two adjacent scanning beams in the azimuth direction of the wave position A (elevation angle θ C , azimuth angle φ C , and amplitude M C ).

[0066] Define the function f(x) to represent the amplitude value of the elevation antenna pattern (round trip of transmission and reception) of beam A, and the independent variable x represents the angular distance from θ A in the elevation direction; the function g(y) represents the amplitude value of the azimuth antenna pattern (round trip of transmission and reception) of beam A, and the independent variable y represents the angular distance from φ A in the azimuth direction; obviously, the functions f(x) and g(y) can be obtained through the antenna design scheme or the actual measurement results of the antenna.

[0067] Define the sets R EL , R AZ as follows:

[0068] (where p = 1, 2,..., 9)

[0069] (where q = 1, 2,..., 9)

[0070] Among the elements of the set R EL , find the p value corresponding to the element that is numerically closest to ; among the elements of the set R AZ , find the q value corresponding to the element that is numerically closest to . Then the elevation angle θ I , azimuth angle φ I of the interference incoming wave direction can be calculated according to the following formula:

[0071]

[0072] Step 5: The radar transmitter is turned on to perform normal detection work (for a short period of time). If it is determined in Step 2 that there is interference, the radar operating parameters are set to the operating frequency point f T , the transmitted waveform W T , and the pointing wave position (elevation angle θ T , azimuth angle φ T ), where f T is the value in the frequency band [f1, f2] that is farthest from the interference frequency point f I , W T is a waveform that is significantly distinguishable from the interference waveform W I , and (elevation angle θ T , azimuth angle φ T ) is the pointing angle of the mission area.

[0073] Step 6: The radar transmitter is turned off, and only the radar receiver is turned on. Passive detection is performed according to Step 1, and the interference frequency f I ′, interference waveform W I ′, and the incoming wave direction of the interference source (elevation angle θ I ′, azimuth angle φ I ′) are obtained again according to Steps 2, 3, and 4.

[0074] Step 7: If the two interference frequencies are different (f I ≠ f I ′), and the interference frequency obtained in Step 6 is the same as the radar operating frequency in Step 5 (f I ′ = f T ), then it is considered that the interference frequency follows the radar operating frequency, and the radar adopts a frequency hopping operating mechanism; otherwise, the radar adopts a fixed frequency operating mechanism, and the operating frequency point is f T .

[0075] Step 8: If the two interference waveforms are different (W I ≠ W I ′), and the interference waveform obtained in Step 6 is similar to the radar transmitted waveform in Step 5 (the correlation coefficient between the two is greater than or equal to 0.9, i.e., ρ(W I ′, W T ) ≥ 0.9), then it is considered that the interference waveform follows the radar operating waveform, and the radar adopts a waveform agility operating mechanism; otherwise, the radar adopts a fixed waveform operating mechanism, and the operating waveform is W T .

[0076] Step 9: Determine whether the interference source with the incoming wave direction (elevation angle θ I ′, azimuth angle φ I ′) in Step 6 is located in the radar coverage extension area. The specific method is as follows:

[0077] Let the elevation angle range of the radar coverage area be [θ a , θ b , and the azimuth angle range be [φ a , φ b ; the angular distance between the first sidelobe and the main lobe of the radar antenna elevation pattern is Δθ, and the angular distance between the first sidelobe and the main lobe of the azimuth pattern is Δφ.

[0078] If θ I ′ ∈ [θ a - Δθ, θ b + Δθ] and φ I ′ ∈ [φ a - Δφ, φ b + Δφ], it is considered that the direction of the interfering incoming wave is in the extended radar coverage area, and then beamforming is performed on the radar receiving pattern to achieve a null in the pattern in the direction of the interfering incoming wave; otherwise, the radar antenna pattern remains unchanged.

[0079] Step 10: The radar is turned on to perform detection work. The setting of the radar operating parameters is based on: the frequency operating mechanism in Step 7, the waveform operating mechanism in Step 8, and the pattern method in Step 9.

[0080] The parts not detailed in the present invention are well-known common knowledge to those skilled in the art.

Claims

1. A multi-domain joint interference suppression method for a phased array radar system, characterized in that include: Step 1: Obtain the characteristics of the interference source: detect and receive the interference signal, analyze and process the detected interference signal, and obtain the direction, frequency and waveform of the interference source; Step 2: Set the radar working parameters according to the principle of maximum deviation from the interference source signal parameters, and start the radar for a short time; then, turn off the radar transmitter, detect and receive the interference signal again, and analyze and process the detected interference signal again to obtain the incoming wave direction, interference frequency and interference waveform of the interference source again; Step 3: Based on the above two detection data, determine whether the interference wave direction is located in the radar coverage extension area, and whether the interference frequency and interference waveform keep dynamic tracking with the working frequency and transmission waveform of the radar system; Step 4: beamforming the receiving antenna pattern according to the interference wave direction: if the interference wave direction is within the radar coverage extension area, the interference wave direction is used as the null angle of the antenna pattern to beamform the radar receiving antenna, otherwise, the radar antenna pattern remains unchanged; Reset the radar operating frequency according to the interference frequency: If the interference frequency and the radar operating frequency keep dynamic tracking, the radar adopts the frequency hopping working mechanism, otherwise, the radar adopts the fixed frequency working mechanism and keeps the working frequency and the interference frequency at the maximum interval within the system bandwidth; Reset the radar radiation waveform according to the interference waveform: if the interference waveform keeps dynamically following the radar working waveform, the radar adopts the waveform agility working mechanism; otherwise, the radar adopts the fixed waveform working mechanism and keeps the working waveform orthogonal to the interference waveform.

2. The multi-domain joint interference suppression method for a phased array radar system according to claim 1, characterized in that: The detecting and receiving of the interference signal is specifically as follows: Before radar detection operation, passive interception is implemented, that is, only the radar receiver is turned on, and the radar transmitter is not turned on. Passive reception is carried out for each wave position k = 1, 2... K and each frequency point j = 1, 2... J within the radar illumination wave position range and the working frequency band range. The interception duration for each frequency point in each wave position is t, and the interception data for the k-th wave position and the j-th frequency point is denoted as S k,j ; The calculation methods of the number of wave positions K, the number of frequency points J, and the detection time t are as follows: Let the elevation scanning range of the radar antenna be [-θ, θ], the azimuth scanning range be [-φ, φ], the elevation main lobe beamwidth of the radar be δθ, and the azimuth main lobe beamwidth be δφ. Then the number of wave positions K within the antenna illumination range is an integer not less than ; Let the operable frequency band range of the radar be [f1, f2], and the instantaneous operating bandwidth be B. Then the number of frequency hops J within the radar frequency band is an integer not less than ; Suppose the radar uses M groups of pulse repetition frequencies to resolve range ambiguity, and the coherent integration time of a single pulse repetition frequency is T CPI , then the detection duration of each frequency point in each wave position is t = M·T CPI .

3. A multi-domain joint interference suppression method for a phased array radar system according to claim 2, characterized in that: Based on the data S received by the radar k,j , analyze whether there is interference and obtain the interference frequency f I . The specific method is as follows: For each frequency point \(j = 1, 2, \ldots, J\) and each waveform position \(k = 1, 2, \ldots, K\), let \(P\) k,j be the detected power converted based on the received data \(S\) k,j , \(\Delta P\) R be the radar receiver noise power, and \(P\) N0 be the in-band power flatness of the radar receiver. If \(P\) k,j \(\geq\Delta P\) R + \(P\) N0 + 1 dB, it is considered that there is interference at the frequency point \(j\) and the waveform position \(k\), and the frequency point \(j\) at this time is recorded as the interference frequency point \(f\) I ; If it is determined that there is interference, obtain the interference waveform W I information. The specific method is as follows: at the interference frequency point f I , find the wave position A with the largest received amplitude among all K wave positions. The parameters at this wave position A are the elevation angle θ A , azimuth angle φ A , and amplitude M A , and record the received data S k,j at this time as the interference signal waveform W I .

4. A multi-domain joint interference suppression method for a phased array radar system according to claim 3, characterized in that: If it is determined that there is interference, obtain the direction of arrival of the interference source, that is, the elevation angle θ I , the azimuth angle φ I , and the specific method is as follows: At the interference frequency point f I Find the beam B with a larger amplitude among the two adjacent scanning beams in the elevation direction of the waveform position A, and the parameters are the elevation angle θ B , the azimuth angle φ B , and the amplitude M B . Find the beam C with a larger amplitude among the two adjacent scanning beams in the azimuth direction of the waveform position A, and the parameters are the elevation angle θ C , the azimuth angle φ C , and the amplitude M C ; Define the function f(x) to represent the amplitude value of the elevation antenna pattern of the A beam, where the independent variable x represents the angular distance from the elevation direction to θ A ; the function g(y) represents the amplitude value of the azimuth antenna pattern of the A beam, and the independent variable y represents the angular distance from the azimuth direction to φ A ; the functions f(x) and g(y) are obtained through the antenna design scheme or the actual measurement results of the antenna; Define the set R EL , R AZ as follows: Among the elements of set R EL , find the p value corresponding to the element that is numerically closest to ; among the elements of set R AZ , find the q value corresponding to the element that is numerically closest to , then the elevation angle θ I and azimuth angle φ I are calculated as follows:

5. A multi-domain joint interference suppression method for a phased array radar system according to claim 4, characterized in that: According to the principle of maximally staggering the parameters of the interference source signal, set the radar operating parameters, specifically: The radar transmitter powers on to perform normal detection work. If interference is determined to exist, the radar operating parameters are set to the operating frequency point f T , the transmitted waveform W T , and the pointing beam position parameters are the elevation angle θ T and any azimuth angle φ T , where f T is the value in the frequency band [f1, f2] that is farthest from the interference frequency point f I , W T is the waveform with the largest distinction from the interference waveform W I , and the elevation angle θ T and azimuth angle φ T are the pointing angles of the mission area.

6. A multi-domain joint interference suppression method for a phased array radar system according to claim 5, characterized in that: The radar transmission is shut down, and only the radar reception is turned on. The interference signal is detected again in the same way as in Step 1, and the detected interference signal is analyzed and processed again to obtain the interference frequency f I ′, interference waveform W I ′ and the incoming wave direction. The incoming wave direction parameters are elevation angle θ I ′, azimuth angle φ I ′.

7. A multi-domain joint interference suppression method for a phased array radar system according to claim 6, characterized in that: The step three is based on the above two detection data to determine whether the interference wave direction is located in the radar coverage extension area, and whether the interference frequency and interference waveform keep dynamic tracking with the working frequency and transmission waveform of the radar system, specifically: If the two interference frequencies are different, f I ≠f I ′, and the interference frequency f I ′ is the same as the radar operating frequency f T , that is, f I ′ = f T , then it is considered that the interference frequency follows the radar operating frequency, and the radar adopts a frequency hopping operating mechanism; otherwise, the radar adopts a fixed frequency operating mechanism, and the operating frequency point is f T ; If the two interference waveforms are different, W I ≠W I ′, and the interference waveform W I ′ is similar to the radar transmission waveform W T , that is, the correlation coefficient ρ(W I ′,W T )≥0.9, then it is considered that the interference waveform follows the radar operating waveform, and the radar adopts a waveform agile operating mechanism; otherwise, the radar adopts a fixed waveform operating mechanism, and the operating waveform is W T。 8. A multi-domain joint interference suppression method for a phased array radar system according to claim 7, characterized in that: Judge the pitch angle θ I ′, azimuth angle φ I ′ Whether the interference source in the incoming wave direction is located in the radar coverage expansion area, the specific method is as follows: Let the elevation angle range of the radar coverage area be [θ a , θ b , and the azimuth angle range be [φ a , φ b ; the angular distance between the first sidelobe and the main lobe of the radar antenna elevation pattern is Δθ, and the angular distance between the first sidelobe and the main lobe of the azimuth pattern is Δφ; If θ I ′ ∈ [θ a - Δθ, θ b + Δθ] and φ I ′ ∈ [φ a - Δφ, φ b + Δφ], it is considered that the direction of the interfering incoming wave is located in the radar coverage expansion area, and then the radar receiving pattern performs beamforming to achieve a pattern null in the direction of the interfering incoming wave; otherwise, the radar antenna pattern remains unchanged.

9. A processor, characterized in that, The processor is used to run a program, wherein the program, when running, executes the multi-domain joint interference suppression method for a phased array radar system according to any one of claims 1 to 8.

10. A computer program product, characterized in that, When the computer program product is executed by a processor, the multi-domain joint interference suppression method for a phased array radar system according to any one of claims 1 to 8 is implemented.

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