A timing adjustment method for dual-platform airborne radar

Abstract

The present invention discloses a timing adjustment method for a dual-platform airborne radar, belonging to the field of timing adjustment technology, and solving the problem in the prior art that airborne radars cannot achieve simultaneous collaborative detection. The method includes calculating the target self-transmitting and self-receiving delay and the other-transmitting and self-receiving delay of the first radar, and the target self-transmitting and self-receiving delay and the other-transmitting and self-receiving delay of the second radar, respectively, based on the distance of tracking the same target, and determining the pulse width of the waveform transmitted by the first radar and the second radar; determining the gate width of the first radar and the second radar respectively, and setting the gate leading edge position and gate trailing edge position of the first radar and the second radar, and adjusting the timing parameters of the first radar and the second radar so that the self-transmitting and self-receiving signal and the other-transmitting and self-receiving signal of the first radar and the self-transmitting and self-receiving signal of the second radar can be received within the gate. This method can be used for timing adjustment of dual-platform airborne radars.

Description

Technical Field

[0001] The present invention belongs to the technical field of timing adjustment, and in particular relates to a timing adjustment method for a dual-platform airborne radar. Background Art

[0002] Radar timing control is a crucial component of overall radar control. To improve radar's interference recognition and countermeasure capabilities, existing airborne radars generally operate on a single platform. In radar timing design, different radars employ alternating transmissions between pulse repetition cycles, perform shift work in different time periods, or operate in different frequency bands, preventing simultaneous coordinated detection. Summary of the Invention

[0003] In view of the above analysis, the present invention aims to provide a timing adjustment method for a dual-platform airborne radar, which solves the problem in the prior art that airborne radars cannot achieve coordinated detection at the same time.

[0004] The purpose of the present invention is mainly achieved through the following technical solutions:

[0005] The present invention provides a timing adjustment method for a dual-platform airborne radar, comprising the following steps:

[0006] Step I: Under the unified time, frequency and space reference, the first radar and the second radar enter the cooperative detection mode, perform time and space conversion on the target information searched by the first radar and the second radar, and determine whether to track the same target;

[0007] Step II: Based on the distance of the same target being tracked, the target's self-transmitting and self-receiving delays and the delays of the other radar's self-transmitting and self-receiving are calculated, and the target's self-transmitting and self-receiving delays and the delays of the other radar's self-transmitting and self-receiving are calculated, respectively, to determine the pulse widths of the waveforms transmitted by the first and second radars.

[0008] Step III: Determine the gate widths of the first radar and the second radar respectively, set the gate leading edge positions and the gate trailing edge positions of the first radar and the second radar, and adjust the timing parameters of the first radar and the second radar so that the self-transmitted and self-received signals and the self-transmitted and self-received signals of the first radar and the self-transmitted and self-received signals of the second radar can be received within the gate.

[0009] Furthermore, the first radar is a master radar and the second radar is a slave radar.

[0010] Furthermore, in step III, adjusting the timing parameters of the first radar includes the following steps:

[0011] Step a: Calculate the target's self-transmitting and self-receiving delay and the other's transmitting and receiving delay of the first radar based on the distance of the same target, and determine the pulse width of the first radar's transmitting waveform;

[0012] Step b: Determine the gate width of the first radar, set the gate leading edge position and gate trailing edge position of the first radar, and adjust the timing parameters of the first radar so that the self-transmitted and self-received signals of the first radar and the self-transmitted and self-received signals of other radars can be received within the gate.

[0013] Furthermore, the first radar receives the delay of the self-transmitted and self-received wave:

[0014] The echo delay range is: [t ACA ,t ACA +τ A +τ0]

[0015] The first radar receives the delay of the return wave it sends:

[0016] The echo delay range is: [t BCA ,t BCA +τ B +τ0].

[0017] Furthermore, when the self-transmitting and self-receiving echo delay range of the first radar overlaps with the self-transmitting and self-receiving echo delay range of the other radar, the echo delay range satisfies:

[0018] t ACA ≤t BCA ≤t ACA +τ A +τ0, or t BCA ≤t ACA ≤t BCA +τ B +τ0

[0019] Therefore, only one sampling gate needs to be set in the first radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0020] Furthermore, when the delay range of the first radar's self-transmitted and self-returned echo does not overlap with the delay range of the other radar's self-transmitted and self-returned echo, the echo delay range satisfies:

[0021] t ACA +τ A +τ0 <t BCA , or t BCA +τ B +τ0 <t ACA

[0022] Therefore, two sampling gates need to be set in the first radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0023] Furthermore, in step III, adjusting the timing parameters of the second radar includes the following steps:

[0024] Step A: Based on the distance of tracking the same target, calculate the target's self-transmitting and self-receiving delay and the other's transmitting and receiving delay of the second radar, and determine the pulse width of the second radar's transmitting waveform;

[0025] Step B: Determine the gate width of the second radar, set the gate leading edge position and gate trailing edge position of the second radar, and adjust the timing parameters of the second radar so that the second radar's self-transmitted and self-received signals and other self-transmitted and self-received signals can be received within the gate.

[0026] Furthermore, the delay of the second radar receiving the self-transmitted and self-received waves is:

[0027] The echo delay range is: [t BCB ,t BCB +τ B +τ0]

[0028] The delay of the second radar receiving the wave it sends back:

[0029] The echo delay range is: [t ACB ,t ACB +τ A +τ0].

[0030] Furthermore, when the second radar's self-transmitting and self-receiving echo delay range overlaps with its self-transmitting and self-receiving echo delay range, the echo delay range satisfies:

[0031] t BCB ≤t ACB ≤t BCB +τ B +τ0, or t ACB ≤t BCB ≤t ACB +τ A +τ0

[0032] Therefore, only one sampling gate needs to be set in the second radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0033] Furthermore, when the second radar's self-transmitting and self-receiving echo delay range does not overlap with its own self-transmitting and self-receiving echo delay range, the echo delay range satisfies:

[0034] t BCB +τ B +τ0 <t ACB , or t ACB +τ A +τ0 <t BCB

[0035] Therefore, two sampling gates need to be set in the second radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0036] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0037] The timing adjustment method for a dual-platform airborne radar provided by the present invention is designed for a dual-platform recording radar cooperative mode. Unlike a single-platform radar that can only receive and process self-transmitted and self-received radar echoes, using the timing adjustment method of this embodiment, in the cooperative mode, the first radar and the second radar can both receive self-transmitted and self-received echo signals and other-transmitted and self-received echo signals. By analyzing, filtering, and detecting the self-transmitted and self-received echo signals and other-transmitted and self-received echo signals, the radar's anti-interference capability is fully utilized in multi-dimensional information such as the time domain, frequency domain, and spatial domain. This lays a foundation for the engineering application of the dual-platform recording radar cooperative mode, has good application potential and economic benefits, and effectively solves the problem in the prior art that airborne radars cannot achieve simultaneous cooperative detection.

[0038] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0040] Figure 1 A schematic flow chart of a timing adjustment method for a dual-platform airborne radar provided in Embodiment 1 of the present invention;

[0041] Figure 2 A schematic diagram of the relationship between the radar and target positions in the timing adjustment method for the dual-platform airborne radar provided in the first embodiment of the present invention;

[0042] Figure 3 A schematic diagram of radar timing design in the case of collaborative detection using a timing adjustment method for dual-platform airborne radars provided in Example 1 of the present invention;

[0043] Figure 4a The matched filtering result of the echo signal transmitted and received by the first radar in the simulation scenario in the timing adjustment method for the dual-platform airborne radar provided in the first embodiment of the present invention;

[0044] Figure 4b The matched filtering results of the echo signals sent and received by the first radar in the simulation scenario in the timing adjustment method for the dual-platform airborne radar provided in the first embodiment of the present invention;

[0045] Figure 4c The matched filtering result of the echo signal transmitted and received by the second radar in the simulation scenario in the timing adjustment method of the dual-platform airborne radar provided in the first embodiment of the present invention;

[0046] Figure 4d This is the matched filtering result of the echo signal sent and received by the second radar in the simulation scenario in the timing adjustment method of the dual-platform airborne radar provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0048] For ease of description, the two radars in the dual-platform airborne radar are referred to as the first radar and the second radar, respectively. Without loss of generality, it is assumed that the first radar is the master radar and the second radar is the slave radar. A target radar echo received by the master radar is called self-transmitted and self-received if it was emitted by the master radar, and is called other-transmitted and self-received if it was emitted by the slave radar. Similarly, a target radar echo received by the slave radar is called self-transmitted and self-received if it was emitted by the slave radar, and is called other-transmitted and self-received if it was emitted by the master radar.

[0049] The present invention provides a timing adjustment method for a dual-platform airborne radar. Figures 1 to 4d , including the following steps:

[0050] Step I: Under the unified time, frequency and space reference, the first radar and the second radar enter the cooperative detection mode, perform time and space conversion on the target information searched by the first radar and the second radar, and determine whether to track the same target;

[0051] Step II: Based on the distance of the same target being tracked, the target's self-transmitting and self-receiving delays and the delays of the other radar's self-transmitting and self-receiving are calculated, and the target's self-transmitting and self-receiving delays and the delays of the other radar's self-transmitting and self-receiving are calculated, respectively, to determine the pulse widths of the waveforms transmitted by the first and second radars.

[0052] Step III: Determine the gate widths of the first radar and the second radar respectively, set the gate leading edge positions and the gate trailing edge positions of the first radar and the second radar, and adjust the timing parameters of the first radar and the second radar so that the self-transmitted and self-received signals and the self-transmitted and self-received signals of the first radar and the self-transmitted and self-received signals of the second radar can be received within the gate.

[0053] Compared with the prior art, the timing adjustment method for the dual-platform airborne radar provided in this embodiment is targeted at the dual-platform recording radar cooperative mode. Unlike a single-platform radar that can only receive and process self-transmitted and self-received radar echoes, using the timing adjustment method of this embodiment, in the cooperative mode, the first radar and the second radar can both receive self-transmitted and self-received echo signals and other-transmitted and self-received echo signals. By analyzing, filtering, and detecting the self-transmitted and self-received echo signals and other-transmitted and self-received echo signals, the radar's anti-interference capability is fully utilized in multi-dimensional information such as the time domain, frequency domain, and spatial domain. This lays the foundation for the engineering application of the dual-platform recording radar cooperative mode, has good application potential and economic benefits, and effectively solves the problem in the prior art that airborne radars cannot achieve simultaneous cooperative detection.

[0054] Specifically, let the distance between the first radar and the target T being tracked be R A , the pulse width of the transmitted signal τ A ; The distance between the second radar and the same target T is R B , the pulse width of the transmitted signal τ B , the electromagnetic wave propagation speed is C, and the target scene size corresponds to the echo delay time τ0.

[0055] In the cooperative mode, the position relationship between the first radar and the second radar and the same target is as follows: Figure 2 As shown, the timing design of the first radar and the second radar is as follows Figure 3 shown.

[0056] Adjusting the timing parameters of the first radar includes the following steps:

[0057] Step a: Calculate the target's self-transmitting and self-receiving delay and the other's transmitting and receiving delay of the first radar based on the distance of the same target, and determine the pulse width of the first radar's transmitting waveform;

[0058] Among them, the delay of the first radar receiving the self-transmitted and self-received wave is:

[0059] The echo delay range is: [t ACA ,t ACA +τ A +τ0]

[0060] The first radar receives the delay of the return wave it sends:

[0061] The echo delay range is: [t BCA ,t BCA +τ B +τ0].

[0062] Step b: Determine the gate width of the first radar, set the gate leading edge position and gate trailing edge position of the first radar, and adjust the timing parameters of the first radar so that the self-transmitted and self-received signals of the first radar and the self-transmitted and self-received signals of other radars can be received within the gate.

[0063] When the self-transmitting and self-receiving echo delay range of the first radar overlaps with the self-transmitting and self-receiving echo delay range of the other radar, the echo delay range satisfies:

[0064] t ACA ≤t BCA ≤t ACA +τ A +τ0, or t BCA ≤t ACA ≤t BCA +τ B +τ0.

[0065] Therefore, only one sampling gate needs to be set in the first radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0066] The sampling gate setting method of the first radar is as follows:

[0067] The leading edge position of the first radar gate is set to: t ACA and t BCA The smaller of

[0068] The trailing edge position of the first radar gate is set to: t ACA +τ A +τ0 and t BCA +τ B +τ0, whichever is greater.

[0069] When the delay range of the first radar's self-transmitted and self-returned echo does not overlap with the delay range of the other radar's self-transmitted and self-returned echo, the echo delay range satisfies:

[0070] t ACA +τ A +τ0 <t BCA , or t BCA +τ B +τ0 <t ACA .

[0071] Therefore, two sampling gates need to be set in the first radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0072] The sampling gate setting method of the first radar is as follows:

[0073] The front position of the wave gate of the first radar's self-transmitting and self-receiving wave is set to: ACA .

[0074] The position of the wave gate trailing edge of the first radar's self-transmitting and self-receiving wave is set to: ACA +τ A +τ0

[0075] The front position of the wave gate of the first radar is set to: BCA .

[0076] The first radar sends and receives the wave gate trailing edge position is set to: BCA +τ B +τ0.

[0077] Similarly, adjusting the timing parameters of the second radar includes the following steps:

[0078] Step A: Based on the distance of tracking the same target, calculate the target's self-transmitting and self-receiving delay and the other's transmitting and receiving delay of the second radar, and determine the pulse width of the second radar's transmitting waveform;

[0079] The delay of the second radar receiving the self-transmitted and self-received wave:

[0080] The echo delay range is: [t BCB ,t BCB +τ B +τ0]

[0081] The delay of the second radar receiving the wave it sends back:

[0082] The echo delay range is: [t ACB ,t ACB +τ A +τ0].

[0083] Step B: Determine the gate width of the second radar, set the gate leading edge position and gate trailing edge position of the second radar, and adjust the timing parameters of the second radar so that the second radar's self-transmitted and self-received signals and other self-transmitted and self-received signals can be received within the gate.

[0084] Accordingly, adjusting the timing parameters of the second radar includes the following steps:

[0085] When the second radar's self-transmitting and self-receiving echo delay range overlaps with its self-transmitting and self-receiving echo delay range, the echo delay range satisfies:

[0086] t BCB ≤t ACB ≤t BCB +τ B +τ0, or t ACB ≤t BCB ≤t ACB +τ A +τ0.

[0087] Therefore, only one sampling gate needs to be set in the second radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0088] The second radar sampling gate setting method is as follows:

[0089] The second radar gate front position is set to: t BCB and t ACB The smaller of

[0090] The trailing edge position of the second radar gate is set to: t BCB +τ B +τ0 and t ACB +τ A +τ0, whichever is greater.

[0091] When the second radar's self-transmitting and self-receiving echo delay range does not overlap with its own self-transmitting and self-receiving echo delay range, the echo delay range satisfies:

[0092] t BCB +τ B +τ0 <t ACB , or t ACB +τ A +τ0 <t BCB .

[0093] Therefore, two sampling gates need to be set in the second radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

[0094] The second radar sampling gate setting method is as follows:

[0095] The front position of the wave gate of the second radar's self-transmitting and self-receiving wave is set to: BCB .

[0096] The second radar's self-transmitting and self-receiving wave gate trailing edge position is set to: BCB +τ B +τ0.

[0097] The front position of the wave gate of the second radar is set to: ACB .

[0098] The second radar's gate trailing edge position for the received wave is set to: ACB +τ A +τ0.

[0099] It should be noted that the pulse width of the transmitted waveform is pre-set, and the echo delay range is related to the target distance of the same tracking target.

[0100] Exemplarily, the above step I includes the following steps:

[0101] Step 1: The first radar and the second radar search for targets respectively. The first radar records the target information searched by the first radar, and the second radar records the target information searched by the second radar.

[0102] Step 2: Establish a unified time, frequency, and space reference for the first and second radars. The first and second radars synchronize time, frequency, and space and enter a collaborative mode at the same frequency.

[0103] Step 3: The first radar and the second radar exchange target information through data links;

[0104] Step 4: Under the unified time reference and space coordinate system, the first radar and the second radar respectively perform time-space conversion and data fusion judgment on the target information they search for, obtain multiple suspected identical targets, and determine the identical target to be tracked from the multiple suspected identical targets under the control of the first radar.

[0105] It should be noted that in the above step 1, the first radar and the second radar respectively work independently in the self-transmitting and self-receiving working mode under their respective time references and space coordinate systems, and only receive and process the target echo signals of the first radar and the second radar respectively.

[0106] Among them, the first radar searches and finds M targets. Under the time reference and space coordinate system of the first radar, the time and space information of the target is recorded as T Ai (t Ai ,r Ai ,α Ai ,β Ai ), i=1,2,…M, that is, target T Ai In t Ai The distance between the moments is r Ai , azimuth angle is α Ai , the pitch angle is β Ai ;

[0107] The second radar searches and finds N targets. Under the time reference and space coordinate system of the second radar, the target time and space information is recorded as That is, the target T Bj In t Bj The distance between the moments is r Bj , azimuth angle is α Bj , the pitch angle is β Bj .

[0108] Specifically, in step 2 above, under the control of the first radar, a unified time base is established for the first radar and the second radar. Through the respective time-frequency synchronizers of the first radar and the second radar, the working sequences of the first radar and the second radar are restarted simultaneously, the time (i.e., timing) base is unified, and the target information of the first radar and the second radar is marked with time-stamp information (i.e., the time information recorded in the target information of the first radar and the second radar under the unified time base). Through the respective navigation systems of the first radar and the second radar, without loss of generality, let the coordinates of the first radar be the origin, and in the unified spatial coordinate system, the coordinates of the second radar be P B (x B ,y B ,z B ), establish a unified spatial coordinate system, and prepare for the successful completion of step 4 below.

[0109] In the above step 3, both the first radar and the second radar can obtain the target time and space information T of the first radar. Ai (t Ai ,r Ai ,α Ai ,β Ai ), i=1,2,…M and the target time and space information of the second radar The first radar obtains the pulse width τ of the second radar B , the second radar obtains the pulse width τ of the first radar A .

[0110] In order to determine the same target to be tracked, the above step 4 includes the following steps:

[0111] Step 41: Target information is converted into time and space

[0112] Since the distance, azimuth and elevation angles in the target information obtained by the first radar and the second radar in step 3 are values ​​in the respective coordinate systems of the first radar and the second radar, it is impossible to directly determine the correspondence between the target found by the first radar and the target found by the second radar.

[0113] Under the unified time base only, the target of the first radar is T Ai (t Ai ,r Ai ,α Ai ,β Ai ), i=1,2,…M, the second radar target is T Bj (t Bj ,r Bj ,α Bj ,β Bj ), j=1,2,...N.

[0114] Under the unified time base and space coordinate system, it is assumed that the target coordinates of the first radar are T Ai (t Ai ,x Ai ,y Ai ,z Ai ), where i = 1, 2, ... M; the coordinates of the second radar target are T Bj (t Bj ,x Bj ,y Bj ,z Bj ), where j = 1, 2, ... N; then the following relationship holds:

[0115] Target coordinates of the first radar:

[0116] x Ai =0+r Ai ·cos(β Ai )sin(α Ai )

[0117] y Ai =0+r Ai ·cos(β Ai )cos(α Ai )

[0118] z Ai =0+r Ai ·sin(β Ai )

[0119] Target coordinates of the second radar:

[0120] x Bj =x B +r Bj ·cos(β Bj )sin(α Bj )

[0121] y Bj =y B +r Bj ·cos(β Bj )cos(α Bj )

[0122] z Bj =z B +r Bj ·sin(β Bj )

[0123] Step 42: Select the target you want to track

[0124] Because a target has only one coordinate value in space at a certain moment, considering the measurement errors of the first and second radars, as well as the target motion and size, let ε be the tolerance threshold of collaborative positioning error. If the following formula is satisfied, multiple suspected identical targets are obtained:

[0125] Where i = 1, 2, ... M, j = 1, 2, ... N;

[0126] Assume that among the M targets of the first radar and the N targets of the second radar, there are K suspected identical targets, where K≤M and K≤N.

[0127] It should be noted that, in practical applications, ε can be set according to actual accuracy requirements. For example, ε can be 10m, 15m, or 20m.

[0128] Step 43: Under the control of the first radar, the same target T to be tracked is determined from multiple suspected same targets. The same target can be selected as needed, and the same target information is transmitted to the second radar through the data link. The second radar tracks the same target T.

[0129] In order to improve the anti-interference capability of the first radar and the second radar in the cooperative mode, the following steps are further included after the above step III:

[0130] Step IV: The first radar and the second radar transmit orthogonal waveforms, and process the self-transmitted and self-received radar echo signals and the other-transmitted and self-received radar echo signals respectively, to determine whether the same target being tracked is a real target.

[0131] Specifically, step IV includes the following steps:

[0132] Step IV1: The first radar and the second radar transmit orthogonal waveforms;

[0133] Among them, the transmission signal of the first radar is:

[0134]

[0135] τ A is the pulse width of the first radar transmission signal, f0 is the center frequency, μ A is the modulation slope of the FM signal, t is the time;

[0136] The transmission signal of the second radar is:

[0137]

[0138] τ B is the pulse width of the second radar transmission signal, f0 is the center frequency, μ Bis the modulation slope of the FM signal;

[0139] Step IV2: the first radar and the second radar respectively process the echo signals of self-transmitted and self-received signals and other-transmitted and self-received signals;

[0140] Among them, the signal of the point target echo of the first radar is:

[0141]

[0142] A ACA is the echo amplitude of the point target sent and received by the first radar (the test data of the first radar itself), f0 is the center frequency, A BCA is the echo amplitude of the first radar from the target point, μ A is the modulation slope of the first radar FM signal; N A (t) is the first radar noise signal.

[0143] The signal of the point target echo from the second radar is

[0144]

[0145] A BCB is the echo amplitude of the second radar’s self-transmitting and self-receiving point target, f0 is the center frequency, A ACB is the echo amplitude of the second target, μ B is the modulation slope of the second FM signal; N B (t) is the second radar noise signal.

[0146] Step IV3: After matching the echo signal and filtering it, the pulse pressure simulation result is obtained, and the authenticity analysis and identification of the target are performed to determine whether the target being tracked is a real target.

[0147] By performing matched filtering on the echo signals to generate pulse compression simulation results, subsequent processing such as target authenticity analysis and identification is performed to improve the radar's anti-interference capability. The first and second radars receive both the self-transmitted and self-received echo signals, ensuring signal integrity without signal loss. By utilizing the orthogonality of positive and negative linear frequency modulation signals, the self-transmitted and self-received signals received by the first and second radars can be effectively processed in blocks, avoiding signal aliasing. This provides an effective technical approach for dual-platform collaborative detection.

[0148] The pulse compression simulation results of the self-transmitted and self-received signals of the first and second radars are as follows: Figures 4a to 4d As shown, Figure 4a 、 Figure 4b They represent the matched filtering results of the first radar's self-transmitted and self-received radar signals, and the other radar's self-transmitted and self-received radar signals respectively; Figure 4c 、 Figure 4d They represent the matched filtering results of the echo signals of the second radar's self-transmitting and self-receiving, and other-transmitting and self-receiving, respectively. By using the method of this embodiment, the first radar and the second radar can operate in the self-transmitting and self-receiving modes and other-transmitting and self-receiving modes in the dual-platform collaborative mode to obtain signal echoes of multi-angle scattering coefficients of the same target. By fusing and identifying the detection results of the two signals, the radar detection and anti-interference capabilities are improved.

[0149] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A timing adjustment method for a dual-platform airborne radar, characterized in that: The steps include: Step I: Under the unified time, frequency and space reference, the first radar and the second radar enter the cooperative detection mode, perform time and space conversion on the target information searched by the first radar and the second radar, and determine whether to track the same target; Step II: Based on the distance of the same target being tracked, the target's self-transmitting and self-receiving delays and the delays of the other radar's self-transmitting and self-receiving are calculated, and the target's self-transmitting and self-receiving delays and the delays of the other radar's self-transmitting and self-receiving are calculated, respectively, to determine the pulse widths of the waveforms transmitted by the first and second radars. Step III: Determine the gate widths of the first radar and the second radar respectively, set the gate leading edge positions and the gate trailing edge positions of the first radar and the second radar, and adjust the timing parameters of the first radar and the second radar so that the self-transmitted and self-received signals and the self-transmitted and self-received signals of the first radar and the self-transmitted and self-received signals of the second radar can be received within the gate.

2. The timing adjustment method for a dual-platform airborne radar according to claim 1, characterized in that: The first radar is a master radar, and the second radar is a slave radar.

3. The timing adjustment method for a dual-platform airborne radar according to claim 1, characterized in that: In step III, adjusting the timing parameters of the first radar includes the following steps: Step a: Calculate the target's self-transmitting and self-receiving delay and the other's transmitting and receiving delay of the first radar based on the distance of the same target, and determine the pulse width of the first radar's transmitting waveform; Step b: Determine the gate width of the first radar, set the gate leading edge position and gate trailing edge position of the first radar, and adjust the timing parameters of the first radar so that the self-transmitted and self-received signals of the first radar and the self-transmitted and self-received signals of other radars can be received within the gate.

4. The timing adjustment method for a dual-platform airborne radar according to claim 3, characterized in that: The delay of the first radar receiving the self-transmitted and self-received wave: The echo delay range is: [t ACA ,t ACA +τ A +τ0] The first radar receives the delay of the return wave it sends: The echo delay range is: [t BCA ,t BCA +τ B +τ0]; The distance between the first radar and the same target T is R A , the pulse width of the transmitted signal τ A ; The distance between the second radar and the same target T is R B , the pulse width of the transmitted signal τ B , the electromagnetic wave propagation speed is C, and the target scene size corresponds to the echo delay time τ0.

5. The timing adjustment method for a dual-platform airborne radar according to claim 4, characterized in that: When the self-transmitting and self-receiving echo delay range of the first radar overlaps with the self-transmitting and self-receiving echo delay range of the other radar, the echo delay range satisfies: t ACA ≤t BCA ≤t ACA +t A +τ0,or t BCA ≤t ACA ≤t BCA +t B +τ0 Therefore, only one sampling gate needs to be set in the first radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

6. The timing adjustment method for a dual-platform airborne radar according to claim 4, characterized in that: When the delay range of the first radar's self-transmitted and self-returned echo does not overlap with the delay range of the other radar's self-transmitted and self-returned echo, the echo delay range satisfies: t ACA +t A +τ0 <t BCA , or t BCA +t B +τ0 <t ACA Therefore, two sampling gates need to be set in the first radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

7. The timing adjustment method for a dual-platform airborne radar according to claim 4, characterized in that: In step III, adjusting the timing parameters of the second radar includes the following steps: Step A: Based on the distance of tracking the same target, calculate the target's self-transmitting and self-receiving delay and the other's transmitting and receiving delay of the second radar, and determine the pulse width of the second radar's transmitting waveform; Step B: Determine the gate width of the second radar, set the gate leading edge position and gate trailing edge position of the second radar, and adjust the timing parameters of the second radar so that the second radar's self-transmitted and self-received signals and other self-transmitted and self-received signals can be received within the gate.

8. The timing adjustment method for a dual-platform airborne radar according to claim 7, characterized in that: The delay of the second radar receiving the self-transmitted and self-received wave: The echo delay range is: [t BCB ,t BCB +τ B +τ0] The delay of the second radar receiving the wave it sends back: The echo delay range is: [t ACB ,t ACB +τ A +τ0].

9. The timing adjustment method for a dual-platform airborne radar according to claim 8, characterized in that: When the second radar's self-transmitting and self-receiving echo delay range overlaps with its self-transmitting and self-receiving echo delay range, the echo delay range satisfies: t BCB ≤t ACB ≤t BCB +t B +τ0,or t ACB ≤t BCB ≤t ACB +t A +τ0 Therefore, only one sampling gate needs to be set in the second radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

10. The timing adjustment method for a dual-platform airborne radar according to claim 8, characterized in that: When the second radar's self-transmitting and self-receiving echo delay range does not overlap with its own self-transmitting and self-receiving echo delay range, the echo delay range satisfies: t BCB +t B +τ0 <t ACB , or t ACB +t A +τ0 <t BCB Therefore, two sampling gates need to be set in the second radar time sequence to realize the collection and processing of self-transmitted and self-received waves and other-transmitted and self-received waves.

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