Radio frequency array multi-target spatial position accurate simulation method and system

Abstract

The invention provides a radio frequency array multi-target spatial position accurate simulation method and system, and the method comprises the steps: a signal processing device generates a plurality of target signals, and after a radio frequency signal is generated through up-conversion, space-fed radiation is completed; the radio frequency array antenna receives a multi-target signal, transmits the multi-target signal to the electronic switch, and transmits the multiple target signals to different target feed channels respectively; multi-target signals are radiated in the same array antenna, four receiving antennas of signal processing equipment collect echo signals at the same time, the steps are repeated after a rotary table rotates by 180 degrees, and the inherent phase error of a receiving link of the system is calculated; according to the actual position of a target, a multi-target echo signal is formed through ternary combination, four receiving antennas of signal processing equipment collect the echo signal at the same time, and a signal phase is extracted; and calculating azimuth angle and pitch angle simulation errors of each target by using a phase comparison method in combination with the inherent phase difference of the system and the target position, and compensating the errors when three elements are combined into the target to realize accurate simulation of the multi-target spatial position.

Description

Technical Field

[0001] The present invention relates to the technical field of radar guidance control semi-physical simulation, and in particular to a method and system for accurately simulating the spatial positions of multiple targets in a radio frequency array. Background Art

[0002] In the field of radar technology, group target tracking and identification is one of the current research focuses, and the design and research of anti-group target radar is also advancing. During the design phase of the radar detection system, a semi-physical simulation system is generally used to verify its performance. The accuracy of the target electromagnetic environment simulation directly affects the radar target identification and tracking capability assessment, which puts forward the requirement of multi-target accurate simulation for the semi-physical simulation system.

[0003] Current simulation systems generally use multiple feeding channels for multi-target simulation. Each channel is calibrated and tested before the test to ensure that the single-target angle simulation error meets the accuracy range. However, if the angle simulation errors of multiple targets are in opposite directions during the simulation test, there may be a problem that the spatial relative position error exceeds the simulation accuracy range, such as Figure 1 As shown, the maximum error can reach twice the single target angle simulation error, seriously affecting the verification of the radar system's target recognition and tracking capabilities.

[0004] A search of prior art literature revealed a Chinese patent with patent number CN111711500A and title “A simulated antenna array calibration and radio frequency signal monitoring system”. This patent proposed a simulated antenna array angle simulation accuracy test method, which completed the antenna angle simulation accuracy evaluation through a statistical model. This method only tests the accuracy of simulating a single target with a single feed channel, and is applied to semi-physical simulation tests of a single target. When using this method for multi-target simulation, it cannot guarantee that the relative position error between targets meets the index requirements. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a method and system for accurately simulating the spatial positions of multiple targets in a radio frequency array.

[0006] The method for accurately simulating the spatial position of multiple targets in a radio frequency array provided by the present invention comprises:

[0007] Step S1: Use a signal processing device to generate multiple target signals, the delay between each target signal is τ, and up-convert to generate a radio frequency signal to complete air-feed radiation;

[0008] Step S2: The RF array antenna receives multiple target signals, and the calibration control computer sends a control signal to switch the electronic switch with a delay of τ, so as to transmit the multiple target signals to each target feeding channel respectively;

[0009] Step S3: The same array antenna radiates multi-target signals, and the four receiving antennas of the signal processing device collect multi-target echo signals and extract the phase of each target echo signal; the turntable rotates 180 degrees and repeats the above steps, and the inherent phase errors of the left and right receiving antenna links and the upper and lower receiving antenna links of the signal processing device are calculated based on the phase values ​​measured twice;

[0010] Step S4: Control the turntable to align the signal processing device with the radar pointing position, use the array three-element combination method to simulate the multi-target spatial position, and the four receiving antennas of the signal processing device collect the multi-target echo signals and extract the phase of each target echo signal;

[0011] Step S5: Combine the inherent error of the equipment and the distance between the target and the radar pointing center, use the phase comparison method to calculate the simulation error of the azimuth and elevation angle of each target, and compensate for the error when the three-element combination is combined into a target, so as to achieve accurate simulation of the spatial position of multiple targets in the RF array.

[0012] Preferably, step S3 comprises:

[0013] Note that the phase of each target signal collected by receiving antenna 1 is α 1aref , α 2aref , …, α naref , the phase of each target signal collected by receiving antenna 2 is α 1lref , α 2lref , …, α nlref , the phase of each target signal collected by receiving antenna 3 is α 1uref , α 2uref , …, α nuref , the phase of each target signal collected by the receiving antenna 4 is α 1rref , α 2rref , …, α nrref , where n is the target number, n = 1, 2, ...;

[0014] Repeat the above steps after the turntable rotates 180 degrees. Note that the phase of each target signal collected by receiving antenna 1 is α 1aref ′、α 2aref ′, …, α naref ′, the phase of each target signal collected by receiving antenna 2 is α 1lref ′、α 2lref ′, …, α nlref ′, the phase of each target signal collected by the receiving antenna 3 is α 1uref ′、α 2uref ′, …, α nuref ′, the phase of each target signal collected by the receiving antenna 4 is α 1rref ′、α 2rref ′, …, α nrref', where n is the target number, n = 1, 2, ...;

[0015] The collected signal phase includes the system link error. The inherent phase difference between the receiving antenna 1 and the receiving antenna 3 is Δα. 1θ , Δα 2θ ,…,Δα nθ , the inherent phase difference between the link lines of receiving antenna 2 and receiving antenna 4 is According to the phase values ​​of the two measurements, the phase error is calculated as:

[0016]

[0017]

[0018] Note that the phase of each target signal collected by receiving antenna 1 is α 1a , α 2a , …, α na , the phase of each target signal collected by receiving antenna 2 is α 1l , α 2l , …, α nl , the phase of each target signal collected by receiving antenna 3 is α 1u , α 2u , …, α nu , the phase of each target signal collected by the receiving antenna 4 is α 1r , α 2r , …, α nr , where n is the target number, n = 1, 2, ...

[0019] Preferably, step S5 comprises: assuming that an array antenna radiates an electromagnetic wave signal in a direction θ with respect to the antenna normal, and the electromagnetic wave at the end face of the receiving antenna is approximately a plane wave when the distance satisfies the far field condition, and when the distance between the two antennas is d, the phase difference of the received signal due to the wave path difference is as follows:

[0020]

[0021] Where λ is the signal wavelength.

[0022] Preferably, in combination with the inherent error of the receiving link, the pitch angle difference of each target is calculated according to the phase difference between the receiving antenna 1 and the receiving antenna 3 as follows:

[0023]

[0024] The azimuth angle difference of each target is calculated based on the phase difference between receiving antenna 2 and receiving antenna 4:

[0025]

[0026] Preferably, the calculated target angle difference includes two parts: target simulation error and angle difference between the target and the radar pointing position. The radar pointing position is The target theoretical position is The target pitch angle simulation error and azimuth angle simulation error are calculated as follows:

[0027]

[0028] The radio frequency array multi-target spatial position accurate simulation system provided by the present invention comprises:

[0029] Module M1: Use signal processing equipment to generate multi-target signals, with a delay of τ between each target signal, and complete air-feed radiation after up-conversion to generate RF signals;

[0030] Module M2: The RF array antenna receives multi-target signals, and the calibration control computer sends a control signal to switch the electronic switch with a delay of τ, transmitting the multiple target signals to each target feeding channel respectively;

[0031] Module M3: Multi-target signals are radiated from the same array antenna, and the four receiving antennas of the signal processing device collect multi-target echo signals and extract the phase of each target echo signal; the turntable rotates 180 degrees and repeats the above process, and the inherent phase errors of the left and right receiving antenna links and the upper and lower receiving antenna links of the signal processing device are calculated based on the phase values ​​measured twice;

[0032] Module M4: Control the turntable to align the signal processing device with the radar pointing position, use the array three-element combination method to simulate the multi-target spatial position, the four-way receiving antenna of the signal processing device collects the multi-target echo signals, and extracts the phase of each target echo signal;

[0033] Module M5: Combined with the inherent error of the equipment and the distance between the target and the radar pointing center, the phase comparison method is used to calculate the simulated errors of the azimuth and elevation angles of each target, and the errors are compensated when the three elements are combined into a target, thereby realizing accurate simulation of the spatial position of multiple targets in the RF array.

[0034] Preferably, the module M3 comprises:

[0035] Note that the phase of each target signal collected by receiving antenna 1 is α 1aref , α 2aref , …, α naref , the phase of each target signal collected by receiving antenna 2 is α 1lref , α 2lref , …, α nlref , the phase of each target signal collected by receiving antenna 3 is α 1uref , α 2uref , …, α nuref, the phase of each target signal collected by the receiving antenna 4 is α 1rref , α 2rref , …, α nrref , where n is the target number, n = 1, 2, ...;

[0036] Repeat the above steps after the turntable rotates 180 degrees. Note that the phase of each target signal collected by receiving antenna 1 is α 1aref ′、α 2aref ′, …, α naref ′, the phase of each target signal collected by receiving antenna 2 is α 1lref ′、α 2lref ′, …, α nlref ′, the phase of each target signal collected by the receiving antenna 3 is α 1uref ′、α 2uref ′, …, α nuref ′, the phase of each target signal collected by the receiving antenna 4 is α 1rref ′、α 2rref ′, …, α nrref ', where n is the target number, n = 1, 2, ...;

[0037] The collected signal phase includes the system link error. The inherent phase difference between the receiving antenna 1 and the receiving antenna 3 is Δα. 1θ , Δα 2θ ,…,Δα nθ , the inherent phase difference between the link lines of receiving antenna 2 and receiving antenna 4 is According to the phase values ​​of the two measurements, the phase error is calculated as:

[0038]

[0039]

[0040] Note that the phase of each target signal collected by receiving antenna 1 is α 1a , α 2a , …, α na , the phase of each target signal collected by receiving antenna 2 is α 1l , α 2l , …, α nl , the phase of each target signal collected by receiving antenna 3 is α 1u , α 2u , …, α nu , the phase of each target signal collected by the receiving antenna 4 is α 1r , α 2r , …, α nr , where n is the target number, n = 1, 2, ...

[0041] Preferably, the module M5 includes: assuming that an array antenna radiates electromagnetic wave signals in a direction θ with respect to the antenna normal, when the distance satisfies the far field condition, the electromagnetic wave at the end face of the receiving antenna is approximately a plane wave, and when the distance between the two antennas is d, the phase difference of the received signal due to the wave path difference is as follows:

[0042]

[0043] Where λ is the signal wavelength.

[0044] Preferably, in combination with the inherent error of the receiving link, the pitch angle difference of each target is calculated according to the phase difference between the receiving antenna 1 and the receiving antenna 3 as follows:

[0045]

[0046] The azimuth angle difference of each target is calculated based on the phase difference between receiving antenna 2 and receiving antenna 4:

[0047]

[0048] Preferably, the calculated target angle difference includes two parts: target simulation error and angle difference between the target and the radar pointing position. The radar pointing position is The target theoretical position is The target pitch angle simulation error and azimuth angle simulation error are calculated as follows:

[0049]

[0050]

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The present invention provides a method for accurately simulating the spatial position of multiple targets in a radio frequency array. The method uses a calibration control computer, a signal processing device, an electronic switch, and target feeding channels 1 to n in combination with a semi-physical simulation system to achieve accurate simulation of the spatial position of multiple targets, support the verification requirements of radar target recognition and tracking capabilities, and improve the simulation accuracy of the spatial position of multiple targets in the semi-physical simulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0054] Figure 1 This is a schematic diagram of multi-target simulation;

[0055] Figure 2 Generate timing diagrams for multiple target signals;

[0056] Figure 3 It is a timing diagram for multi-target signal processing;

[0057] Figure 4 A schematic diagram of accurate simulation of multi-target spatial positions achieved by the present invention;

[0058] Figure 5 It is a method for accurately simulating the spatial position of multiple targets in a radio frequency array and a working principle diagram of the system;

[0059] Figure 6 Antenna layout diagram for signal processing equipment;

[0060] Figure 7 This is the principle diagram of the phase comparison method for measuring angle simulation error;

[0061] Figure 8 Schematic diagram of multi-objective simulation error. DETAILED DESCRIPTION

[0062] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0063] Example 1

[0064] The present invention proposes a method and system for accurately simulating the spatial position of multiple targets in a radio frequency array. The system has the functions of multi-target signal generation, signal angle simulation and signal acquisition. The system realizes the simulation channel allocation by controlling the delay between targets (us level), realizes the simultaneous processing of multiple targets by controlling the processing cycle of multi-target signals (ms level), and simulates the process of radar detecting multiple targets. The signal generation and processing timing are as follows: Figure 2 and Figure 3 After that, the relative error of multi-target angle simulation is calculated based on the collected echo signal phase. After compensating the error, the accurate simulation of multi-target spatial position can be achieved. The schematic diagram of multi-target simulation after correction is shown in Figure 4 shown.

[0065] This method can also be used to accurately simulate the relative positions of multiple scattering points during the movement of body targets, supporting the verification of radar target recognition performance.

[0066] like Figure 5 The present invention provides a method for accurately simulating the spatial position of multiple targets in a radio frequency array, comprising the following steps:

[0067] Step 1: Determine the multi-target frequency points according to the radar detection scenario, and use the signal processing equipment to generate the multi-target intermediate frequency signal. In order to enable the system to distinguish the multi-target signals, set the delay between each target signal to τ, the initial phase to 0, and the signal timing as follows: Figure 2 As shown in the figure, the purpose of setting the signal delay is to enable the system to distinguish multiple target signals, with an order of magnitude of us. After the intermediate frequency signal is up-converted and the DA board generates the RF signal, it is radiated through the antenna. The antenna position and signal processing equipment antenna layout are shown in the figure. Figure 6 As shown;

[0068] Step 2: The RF array antenna receives multiple target signals and transmits them to the electronic switch. The calibration control computer sends a control signal to switch the electronic switch with a delay of τ, and transmits the multiple target signals to different target feeding channels respectively.

[0069] Step 3: The same array antenna radiates multi-target signals, and the four receiving antennas of the signal processing device collect multi-target echo signals and extract the phase of each target signal. The phase of each target signal collected by receiving antenna 1 is α 1aref , α 2aref , …, α naref , the phase of each target signal collected by receiving antenna 2 is α 1lref , α 2lref , …, α nlref , the phase of each target signal collected by receiving antenna 3 is α 1uref , α 2uref , …, α nuref , the phase of each target signal collected by the receiving antenna 4 is α 1rref , α 2rref , …, α nrref , where n is the target number, n = 1, 2, ….

[0070] Repeat the above steps after the turntable rotates 180 degrees. Note that the phase of each target signal collected by receiving antenna 1 is α 1aref ′、α 2aref ′, …, α naref ′, the phase of each target signal collected by receiving antenna 2 is α 1lref ′、α 2lref ′, …, α nlref ′, the phase of each target signal collected by the receiving antenna 3 is α 1uref ′、α 2uref ′, …, α nuref ′, the phase of each target signal collected by the receiving antenna 4 is α 1rref ′、α 2rref ′, …, α nrref ′, where n is the target number, n=1, 2, ….

[0071] The collected signal phase includes the system link error. The inherent phase difference between the receiving antenna 1 and the receiving antenna 3 is Δα. 1θ , Δα 2θ ,…,Δα nθ , the inherent phase difference between the link lines of receiving antenna 2 and receiving antenna 4 is According to the phase values ​​measured twice in step 3, the phase error can be calculated as:

[0072]

[0073]

[0074] Step 4: According to the actual position of the target, a three-element combination is used to form a multi-target echo signal. The four receiving antennas of the signal processing device collect the echo signal at the same time, and extract the phase of each target signal. The phase of each target signal collected by receiving antenna 1 is α 1a , α 2a , …, α na , the phase of each target signal collected by receiving antenna 2 is α 1l , α 2l , …, α nl , the phase of each target signal collected by receiving antenna 3 is α 1u , α 2u , …, α nu , the phase of each target signal collected by the receiving antenna 4 is α 1r , α 2r , …, α nr , where n is the target number, n = 1, 2, ...

[0075] Step 5: Combine the inherent error of the equipment and the distance between the target and the radar pointing center, and use the phase comparison method to calculate the simulated azimuth error of each target. and pitch angle simulation error Δθ n .

[0076] The principle of phase comparison angle measurement is as follows Figure 7 As shown, assuming that there is an array antenna radiating electromagnetic wave signals in the direction of θ with respect to the antenna normal, when the distance meets the far-field condition, the electromagnetic wave at the end face of the receiving antenna is approximately a plane wave. When the distance between the two antennas is d, the phase difference of the received signal due to the wave path difference is as follows:

[0077]

[0078] Where λ is the signal wavelength. Combined with the inherent error of the receiving link, the pitch angle difference of each target is calculated based on the phase difference between receiving antenna 1 and receiving antenna 3:

[0079]

[0080] The azimuth angle difference of each target is calculated based on the phase difference between receiving antenna 2 and receiving antenna 4:

[0081]

[0082] from Figure 8 It can be seen that the calculated target angle difference includes two parts: target simulation error and angle difference between target and radar pointing position. The radar pointing position is The target theoretical position is Combining the above formulas, the target pitch angle simulation error and azimuth angle simulation error are calculated as follows:

[0083]

[0084]

[0085] The calculated angle simulation errors are stored in each target feeding channel respectively, and the errors are compensated when the ternary combination is formed, so that the accurate simulation of the spatial position of multiple targets can be achieved.

[0086] According to the radar working scenario, the above method can be used to complete the accurate simulation of the spatial relative positions of multiple targets in the entire working process, supporting the needs of target recognition and tracking performance verification.

[0087] Example 2

[0088] The present invention also provides a radio frequency array multi-target spatial position precise simulation system, which can be implemented by executing the process steps of the radio frequency array multi-target spatial position precise simulation method, that is, those skilled in the art can understand the radio frequency array multi-target spatial position precise simulation method as a preferred implementation of the radio frequency array multi-target spatial position precise simulation system.

[0089] The radio frequency array multi-target spatial position accurate simulation system provided by the present invention comprises:

[0090] Module M1: Use signal processing equipment to generate multi-target signals, with a delay of τ between each target signal, and complete air-feed radiation after up-conversion to generate RF signals;

[0091] Module M2: The RF array antenna receives multi-target signals, and the calibration control computer sends a control signal to switch the electronic switch with a delay of τ, transmitting the multiple target signals to each target feeding channel respectively;

[0092] Module M3: Multi-target signals are radiated from the same array antenna, and the four receiving antennas of the signal processing device collect multi-target echo signals and extract the phase of each target echo signal; the turntable rotates 180 degrees and repeats the above process, and the inherent phase errors of the left and right receiving antenna links and the upper and lower receiving antenna links of the signal processing device are calculated based on the phase values ​​of the two measurements;

[0093] Module M4: Control the turntable to align the signal processing device with the radar pointing position, use the array three-element combination method to simulate the multi-target spatial position, the four-way receiving antenna of the signal processing device collects the multi-target echo signals, and extracts the phase of each target echo signal;

[0094] Module M5: Combined with the inherent error of the equipment and the distance between the target and the radar pointing center, the phase comparison method is used to calculate the simulated errors of the azimuth and elevation angles of each target, and the errors are compensated when the three elements are combined into a target, thereby realizing accurate simulation of the spatial position of multiple targets in the RF array.

[0095] The module M3 comprises:

[0096] Note that the phase of each target signal collected by receiving antenna 1 is α 1aref , α 2aref , …, α naref , the phase of each target signal collected by receiving antenna 2 is α 1lref , α 2lref , …, α nlref , the phase of each target signal collected by receiving antenna 3 is α 1uref , α 2uref , …, α nuref , the phase of each target signal collected by the receiving antenna 4 is α 1rref , α 2rref , …, α nrref , where n is the target number, n = 1, 2, ...;

[0097] Repeat the above steps after the turntable rotates 180 degrees. Note that the phase of each target signal collected by receiving antenna 1 is α 1aref ′、α 2aref ′, …, α naref ′, the phase of each target signal collected by receiving antenna 2 is α 1lref ′、α 2lref ′, …, α nlref ′, the phase of each target signal collected by the receiving antenna 3 is α 1uref ′、α 2uref ′, …, α nuref ′, the phase of each target signal collected by the receiving antenna 4 is α 1rref ′、α 2rref ′, …, α nrref', where n is the target number, n = 1, 2, ...;

[0098] The collected signal phase includes the system link error. The inherent phase difference between the receiving antenna 1 and the receiving antenna 3 is Δα. 1θ , Δα 2θ ,…,Δα nθ , the inherent phase difference between the link lines of receiving antenna 2 and receiving antenna 4 is According to the phase values ​​of the two measurements, the phase error is calculated as:

[0099]

[0100]

[0101] Note that the phase of each target signal collected by receiving antenna 1 is α 1a , α 2a , …, α na , the phase of each target signal collected by receiving antenna 2 is α 1l , α 2l , …, α nl , the phase of each target signal collected by receiving antenna 3 is α 1u , α 2u , …, α nu , the phase of each target signal collected by the receiving antenna 4 is α 1r , α 2r , …, α nr , where n is the target number, n = 1, 2, ...

[0102] The module M5 includes: assuming that an array antenna radiates electromagnetic wave signals in the direction θ with respect to the antenna normal, when the distance satisfies the far field condition, the electromagnetic wave at the end face of the receiving antenna is approximately a plane wave, and when the distance between the two antennas is d, the phase difference of the received signal due to the wave path difference is as follows:

[0103]

[0104] Where λ is the signal wavelength.

[0105] Combined with the inherent error of the receiving link, the pitch angle difference of each target is calculated according to the phase difference between receiving antenna 1 and receiving antenna 3:

[0106]

[0107] The azimuth angle difference of each target is calculated based on the phase difference between receiving antenna 2 and receiving antenna 4:

[0108]

[0109] The calculated target angle difference includes the target simulation error and the angle difference between the target and the radar pointing position. The radar pointing position is The target theoretical position is The target pitch angle simulation error and azimuth angle simulation error are calculated as follows:

[0110]

[0111]

[0112] Those skilled in the art know that, in addition to implementing the system, device and its various modules provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same program in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, the system, device and its various modules provided by the present invention can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures within the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing the method and structures within the hardware component.

[0113] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for accurately simulating the spatial position of multiple targets in a radio frequency array, characterized in that: include: Step S1: Use a signal processing device to generate multiple target signals, the delay between each target signal is τ, and up-convert to generate a radio frequency signal to complete air-feed radiation; Step S2: The RF array antenna receives multiple target signals, and the calibration control computer sends a control signal to switch the electronic switch with a delay of τ, so as to transmit the multiple target signals to each target feeding channel respectively; Step S3: The same array antenna radiates multi-target signals, and the four receiving antennas of the signal processing device collect multi-target echo signals and extract the phase of each target echo signal; the turntable rotates 180 degrees and repeats the above steps, and the inherent phase errors of the left and right receiving antenna links and the upper and lower receiving antenna links of the signal processing device are calculated based on the phase values ​​measured twice; Step S4: Control the turntable to align the signal processing device with the radar pointing position, use the array three-element combination method to simulate the multi-target spatial position, and the four receiving antennas of the signal processing device collect the multi-target echo signals and extract the phase of each target echo signal; Step S5: Combine the inherent error of the equipment and the distance between the target and the radar pointing center, use the phase comparison method to calculate the simulation error of the azimuth and elevation angle of each target, and compensate for the error when the three-element combination is combined into a target, so as to achieve accurate simulation of the spatial position of multiple targets in the RF array.

2. The method for accurately simulating the spatial position of multiple targets using a radio frequency array according to claim 1, characterized in that: The step S3 comprises: Note that the phase of each target signal collected by receiving antenna 1 is α 1aref , α 2aref , …, α naref , the phase of each target signal collected by receiving antenna 2 is α 1lref , α 2lref , …, α nlref , the phase of each target signal collected by receiving antenna 3 is α 1uref , α 2uref , …, α nuref , the phase of each target signal collected by the receiving antenna 4 is α 1rref , α 2rref , …, α nrref , where n is the target number, n = 1, 2, ...; Repeat the above steps after the turntable rotates 180 degrees. Note that the phase of each target signal collected by receiving antenna 1 is α 1aref ′、α 2aref ′, …, α naref ′, the phase of each target signal collected by receiving antenna 2 is α 1lref ′、α 2lref ′, …, α nlref ′, the phase of each target signal collected by the receiving antenna 3 is α 1uref ′、α 2uref ′, …, α nuref ′, the phase of each target signal collected by the receiving antenna 4 is α 1rref ′、α 2rref ′, …, α nrref ', where n is the target number, n = 1, 2, ...; The collected signal phase includes the system link error. The inherent phase difference between the receiving antenna 1 and the receiving antenna 3 is Δα. 1θ , Δα 2θ ,…,Δα nθ , the inherent phase difference between the link lines of receiving antenna 2 and receiving antenna 4 is Δα 1φ , Δα 2φ ,…,Δα nφ , according to the phase values ​​of the two measurements, the phase error is calculated as: Note that the phase of each target signal collected by receiving antenna 1 is α 1a , α 2a , …, α na , the phase of each target signal collected by receiving antenna 2 is α 1l , α 2l , …, α nl , the phase of each target signal collected by receiving antenna 3 is α 1u , α 2u , …, α nu , the phase of each target signal collected by the receiving antenna 4 is α 1r , α 2r , …, α nr , where n is the target number, n = 1, 2, ...

3. The method for accurately simulating the spatial position of multiple targets using a radio frequency array according to claim 2, characterized in that: The step S5 comprises: assuming that an array antenna radiates electromagnetic wave signals in a direction θ with respect to the antenna normal, and the electromagnetic wave at the end face of the receiving antenna is approximately a plane wave when the distance satisfies the far field condition, and when the distance between the two antennas is d, the phase difference of the received signal due to the wave path difference is as follows: Where λ is the signal wavelength.

4. The method for accurately simulating the spatial position of multiple targets using a radio frequency array according to claim 3, characterized in that: Combined with the inherent error of the receiving link, the pitch angle difference of each target is calculated according to the phase difference between receiving antenna 1 and receiving antenna 3: The azimuth angle difference of each target is calculated based on the phase difference between receiving antenna 2 and receiving antenna 4:

5. The method for accurately simulating the spatial position of multiple targets using a radio frequency array according to claim 4, characterized in that: The calculated target angle difference includes the target simulation error and the angle difference between the target and the radar pointing position. The radar pointing position is The target theoretical position is The target pitch angle simulation error and azimuth angle simulation error are calculated as follows:

6. A radio frequency array multi-target spatial position accurate simulation system, characterized in that: include: Module M1: Use signal processing equipment to generate multi-target signals, with a delay of τ between each target signal, and complete air-feed radiation after up-conversion to generate RF signals; Module M2: The RF array antenna receives multi-target signals, and the calibration control computer sends a control signal to switch the electronic switch with a delay of τ, transmitting the multiple target signals to each target feeding channel respectively; Module M3: Multi-target signals are radiated from the same array antenna, and the four receiving antennas of the signal processing device collect multi-target echo signals and extract the phase of each target echo signal; the turntable rotates 180 degrees and repeats the above process, and the inherent phase errors of the left and right receiving antenna links and the upper and lower receiving antenna links of the signal processing device are calculated based on the phase values ​​measured twice; Module M4: Control the turntable to align the signal processing device with the radar pointing position, use the array three-element combination method to simulate the multi-target spatial position, the four-way receiving antenna of the signal processing device collects the multi-target echo signals, and extracts the phase of each target echo signal; Module M5: Combined with the inherent error of the equipment and the distance between the target and the radar pointing center, the phase comparison method is used to calculate the simulated errors of the azimuth and elevation angles of each target, and the errors are compensated when the three elements are combined into a target, thereby realizing accurate simulation of the spatial position of multiple targets in the RF array.

7. The radio frequency array multi-target spatial position accurate simulation system according to claim 6, characterized in that: The module M3 comprises: Note that the phase of each target signal collected by receiving antenna 1 is α 1aref , α 2aref , …, α naref , the phase of each target signal collected by receiving antenna 2 is α 1lref , α 2lref , …, α nlref , the phase of each target signal collected by receiving antenna 3 is α 1uref , α 2uref , …, α nuref , the phase of each target signal collected by the receiving antenna 4 is α 1rref , α 2rref , …, α nrref , where n is the target number, n = 1, 2, ...; Repeat the above steps after the turntable rotates 180 degrees. Note that the phase of each target signal collected by receiving antenna 1 is α 1aref ′、α 2aref ′, …, α naref ′, the phase of each target signal collected by receiving antenna 2 is α 1lref ′、α 2lref ′, …, α nlref ′, the phase of each target signal collected by the receiving antenna 3 is α 1uref ′、α 2uref ′, …, α nuref ′, the phase of each target signal collected by the receiving antenna 4 is α 1rref ′、α 2rref ′, …, α nrref ', where n is the target number, n = 1, 2, ...; The collected signal phase includes the system link error. The inherent phase difference between the receiving antenna 1 and the receiving antenna 3 is Δα. 1θ , Δα 2θ ,…,Δα nθ , the inherent phase difference between the link lines of receiving antenna 2 and receiving antenna 4 is Δα 1φ , Δα 2φ ,…,Δα nφ , according to the phase values ​​of the two measurements, the phase error is calculated as: Note that the phase of each target signal collected by receiving antenna 1 is α 1a , α 2a , …, α na , the phase of each target signal collected by receiving antenna 2 is α 1l , α 2l , …, α nl , the phase of each target signal collected by receiving antenna 3 is α 1u , α 2u , …, α nu , the phase of each target signal collected by the receiving antenna 4 is α 1r , α 2r , …, α nr , where n is the target number, n = 1, 2, ...

8. The radio frequency array multi-target spatial position accurate simulation system according to claim 7, characterized in that: The module M5 includes: assuming that an array antenna radiates electromagnetic wave signals in the direction θ with respect to the antenna normal, when the distance satisfies the far field condition, the electromagnetic wave at the end face of the receiving antenna is approximately a plane wave, and when the distance between the two antennas is d, the phase difference of the received signal due to the wave path difference is as follows: Where λ is the signal wavelength.

9. The radio frequency array multi-target spatial position accurate simulation system according to claim 8, characterized in that: Combined with the inherent error of the receiving link, the pitch angle difference of each target is calculated according to the phase difference between receiving antenna 1 and receiving antenna 3: The azimuth angle difference of each target is calculated based on the phase difference between receiving antenna 2 and receiving antenna 4:

10. The radio frequency array multi-target spatial position accurate simulation system according to claim 9, characterized in that: The calculated target angle difference includes the target simulation error and the angle difference between the target and the radar pointing position. The radar pointing position is The target theoretical position is The target pitch angle simulation error and azimuth angle simulation error are calculated as follows:

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