A verification method for angular accuracy of radio frequency simulation array

Abstract

The present invention discloses a verification method for angular accuracy of radio frequency simulation array, which mainly adopts a hardware structure including antenna, radio frequency switch, control board, and vector network analyzer, and controls array trajectory points, multi-element beam synthesis, calibration equipment antenna switching, calculates measured pitch angle and azimuth angle, angular accuracy evaluation and other processes, and uses a unique angular accuracy evaluation algorithm to solve this data to obtain the measured value of angular accuracy evaluation. This method makes the angular accuracy measurement work simple and efficient, improves test efficiency, and reduces test time. This method is suitable for product scientific research, production, acceptance and other scenarios.

Description

Technical Field

[0001] The invention belongs to the technical field of angular accuracy testing of radio frequency simulation arrays, and in particular relates to a method for verifying the angular accuracy of a radio frequency simulation array. Background Art

[0002] The RF simulation array is an important part of the radar semi-physical simulation test. The RF simulation array can receive the target echo, interference signal or clutter signal output by the simulator, and control the output channel of the target echo signal by adjusting the amplitude and phase parameters of the echo signal, simulating the spatial output angular position parameters of different target and interference signals.

[0003] In the early stage of RF simulation array construction, it is often necessary to evaluate the angular accuracy of the array's beam synthesis. The traditional method is to make a receiver to down-convert the signal received by the interferometer, collect it by AD, and then perform digital processing to achieve the measurement of the angular position. The receiver design and signal processing algorithm often take a lot of time and effort, and may also be unstable in engineering applications, affecting the measurement results. Summary of the invention

[0004] The purpose of the present invention is to provide a method for verifying the angular accuracy of a radio frequency simulation array. This angular accuracy verification method is stable, reliable and fast, which improves the efficiency of project delivery and acceptance, so as to solve the problems in the prior art raised in the above background technology.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for verifying the angular accuracy of a radio frequency simulation array includes a hardware architecture for verifying the angular accuracy of a radio frequency simulation array and a host computer software for verifying the angular accuracy of the radio frequency simulation array. The host computer software is connected to the hardware architecture through a network port, and specifically includes the following steps:

[0007] S1, control array trajectory points, the array control computer controls the array to simulate the target trajectory points using multiple groups;

[0008] S2, multi-element beam synthesis, the array synthesizes the beam by combining multiple trajectory points;

[0009] S3, the calibration device antenna is switched, and the array antenna synthetic beam is radiated through space to the calibration device antenna;

[0010] S4, the upper computer software controls the calibration equipment to switch the four receiving antennas A, B, C, and D in sequence, and controls the network to measure the IQ data of the corresponding antennas;

[0011] S5, determine whether all trajectory points have been verified. If not, return to S1 and start again. If all trajectory points have been verified, store them in the database, and then use the angular accuracy evaluation algorithm to solve the data and calculate the amplitude, phase, and IQ data of the corresponding frequency points.

[0012] The angular accuracy evaluation algorithm process is as follows:

[0013] 1) For each test position, calculate the theoretical measured phase difference of that point

[0014]

[0015] ψ=ksinξ

[0016]

[0017] 2) According to the measured data, the azimuth phase difference of each test is solved as ψ m , the pitch angle phase difference is

[0018]

[0019] ψ m =arg(m2 / m4)

[0020] 3) Calculation of measurement target position:

[0021] Target measurement position:

[0022]

[0023]

[0024] Measurement error:

[0025]

[0026]

[0027] Preferably, the switch switching in S3 is switched by a network port command of the control panel.

[0028] Preferably, the theoretical measured phase difference of the point is calculated in S5 Style

[0029]

[0030] ψ=ksinξ

[0031]

[0032] Middle: d is the distance between the two antennas of the calibration device;

[0033] λ is the test signal wavelength λ = c / f;

[0034] is the target pitch phase difference of the theoretical trajectory;

[0035] ψ is the target azimuth phase difference of the theoretical trajectory;

[0036] ξ is the theoretical target azimuth;

[0037] ζ is the theoretical target pitch angle.

[0038] Preferably, in S5, the azimuth phase difference of each test is solved according to the measured data as ψ m , the pitch angle phase difference is Mode

[0039]

[0040] ψ m =arg(m2 / m4)

[0041] Where arg(·) represents the phase angle of the calculated complex number, and m1~m4 are the complex data received by the four receiving antennas of the calibration device.

[0042] Take the azimuth angle as an example, the same is true for the elevation angle;

[0043] ψ si =ψ mi -ψ i

[0044] ψ si =ψ mi -ψ s0

[0045] ψ si After normalization to the range of [-π, π], it becomes ψ' si

[0046] ψ'' si =ψ' si -ψ' ave

[0047] And calculate in the same way

[0048] Preferably, in S5 is the azimuth phase difference and elevation phase difference after phase compensation.

[0049] Preferably, the hardware architecture includes four receiving antennas, a single-pole multi-throw switch RF switch, a control board and a vector network analyzer. The host computer software is connected to the control board through a network port. After sending a control command, the single-pole multi-throw switch is turned on to the corresponding receiving antenna. At the same time, the host computer software obtains the amplitude, phase, and IQ data of the corresponding frequency point by controlling the vector network analyzer, and uses the angular accuracy evaluation algorithm to solve this data to obtain the measured value of the angular accuracy evaluation.

[0050] Preferably, the single-pole multi-throw switch and four receiving antennas together constitute a calibration device.

[0051] Technical effects and advantages of the present invention: Compared with the prior art, the verification method of the angular accuracy of a radio frequency simulation array proposed by the present invention has the following advantages:

[0052] The host computer software is connected to the control board through the network port. After sending the control command, the single-pole multi-throw switch is turned on to the corresponding receiving antenna. At the same time, the host computer software obtains the amplitude, phase, and IQ data of the corresponding frequency point by controlling the vector network analyzer, and uses the angular accuracy evaluation algorithm to solve this data to obtain the actual measurement of the angular accuracy evaluation, realizing the angular accuracy evaluation of array beam synthesis. This angular accuracy verification method is stable, reliable, and fast, which improves the efficiency of project delivery and acceptance. This method makes the angular accuracy measurement work simple and efficient, improves the test efficiency, and reduces the test time. This method is suitable for product research, production, acceptance and other scenarios.

[0053] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a flowchart of the angle accuracy verification of the present invention;

[0055] Figure 2 This is a schematic diagram of the angular accuracy verification principle of the present invention;

[0056] Figure 3 This is a schematic diagram of the array position in Example 1 of the present invention;

[0057] Figure 4 A partial data diagram of the read data of Example 1 of the present invention;

[0058] Figure 5 It is a schematic diagram of the roll angle accuracy of Example 1 of the present invention;

[0059] Figure 6 It is a schematic diagram of the pitch angle accuracy of Example 1 of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] The present invention provides Figures 1-2 The example shown:

[0062] A method for verifying the angular accuracy of a radio frequency simulation array includes a hardware architecture for verifying the angular accuracy of the radio frequency simulation array and a host computer software for verifying the angular accuracy of the radio frequency simulation array. The hardware architecture includes four receiving antennas, a single-pole multi-throw switch radio frequency switch, a control board and a vector network analyzer. The host computer software is connected to the control board through a network port. After sending a control instruction, the single-pole multi-throw switch is connected to the corresponding receiving antenna, and the single-pole multi-throw switch and the four receiving antennas together constitute a calibration device. At the same time, the host computer software obtains the amplitude, phase, and IQ data of the corresponding frequency point by controlling the vector network analyzer, and uses an angular accuracy evaluation algorithm to solve the data to obtain a measured value of the angular accuracy evaluation. The method specifically includes the following steps:

[0063] S1, control array trajectory points, the array control computer controls the array to simulate the target trajectory points using multiple groups;

[0064] S2, multi-element beam synthesis, the array synthesizes the beam by combining multiple trajectory points;

[0065] S3, calibration equipment antenna switching, the array antenna synthetic beam is radiated to the calibration equipment antenna through space, and the switch is switched through the network port command of the control panel;

[0066] S4, the upper computer software controls the calibration equipment to switch the four receiving antennas A, B, C, and D in sequence, and controls the network to measure the IQ data of the corresponding antennas;

[0067] S5, determine whether all trajectory points have been verified. If not, return to S1 and start again. If all trajectory points have been verified, store them in the database, and then use the angular accuracy evaluation algorithm to solve the data and calculate the amplitude, phase, and IQ data of the corresponding frequency points.

[0068] The angular accuracy evaluation algorithm process is as follows:

[0069] 1) For each test position, calculate the theoretical measured phase difference of that point

[0070]

[0071] ψ=ksinξ

[0072]

[0073] Where: d is the distance between the two antennas of the calibration device;

[0074] λ is the test signal wavelength λ = c / f;

[0075] is the target pitch phase difference of the theoretical trajectory;

[0076] ψ is the target azimuth phase difference of the theoretical trajectory;

[0077] ξ is the theoretical target azimuth;

[0078] ζ is the theoretical target pitch angle.

[0079] 2) According to the measured data, the azimuth phase difference of each test is solved as ψ m , the pitch angle phase difference is

[0080]

[0081] ψ m =arg(m2 / m4)

[0082] Where arg(·) represents the phase angle of the calculated complex number, and m1~m4 are the complex data received by the four receiving antennas of the calibration equipment.

[0083] Take the azimuth angle as an example, the same is true for the elevation angle;

[0084] ψ si =ψ mi -ψ i

[0085] ψ si =ψ mi -ψ s0

[0086] ψ si After normalization to the range of [-π, π], it becomes ψ' si

[0087] ψ'' si =ψ' si -ψ' ave

[0088] And calculate in the same way

[0089] is the azimuth phase difference and elevation phase difference after phase compensation.

[0090] 3) Calculation of measurement target position:

[0091] Target measurement position:

[0092]

[0093]

[0094] Measurement error:

[0095]

[0096]

[0097] According to the above embodiment, the following specific embodiment 1 is made:

[0098] 1. Control the array to generate the target accuracy test trajectory. In this case, the "horizontal" part of the upper part of the array is selected as the trajectory for angular accuracy verification, with a frequency of 12 GHz. Figure 3 shown.

[0099] 2. After each trajectory point is sent, the switch position of the single-pole multi-throw in the calibration device is controlled according to the calibration device protocol. Each time the switch is switched, the original IQ data of the network is read once, such as Figure 4 3. The final collected data is processed by software according to a verification method of the angular accuracy of a radio frequency simulation array in this embodiment, and the obtained rolling angle accuracy data is as follows: Figure 5 As shown in the figure, the pitch angle accuracy is Figure 6 shown.

[0100] From the processing results, we can see that the roll angle accuracy of this trajectory ranges from -3 to 2 mrad, and the pitch angle accuracy of this trajectory ranges from -4 to 3 mrad. The standard deviation of the angular accuracy is calculated, and the final roll angle accuracy is 1 mrad, and the pitch angle accuracy is 2 mrad. Therefore, this method makes the angular accuracy measurement work simple and efficient, improves the test efficiency and reduces the test time. This method is suitable for product research, production, acceptance and other scenarios.

[0101] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for verifying the angular accuracy of a radio frequency simulation array, characterized in that: It includes a hardware architecture for verifying the angular accuracy of the RF simulation array and a host computer software for verifying the angular accuracy of the RF simulation array. The host computer software is connected to the hardware architecture through a network port, and specifically includes the following steps: S1, control array trajectory points, the array control computer controls the array to simulate the target trajectory points using multiple groups; S2, multi-element beam synthesis, the array synthesizes the beam by combining multiple trajectory points; S3, the calibration device antenna is switched, and the array antenna synthetic beam is radiated through space to the calibration device antenna; S4, the upper computer software controls the calibration equipment to switch the four antennas A, B, C, and D in sequence, and controls the network to measure the IQ data of the corresponding antennas; S5, determine whether all trajectory points have been verified. If not, return to S1 and start again. If all trajectory points have been verified, store them in the database, and then use the angular accuracy evaluation algorithm to solve the data and calculate the amplitude, phase, and IQ data of the corresponding frequency points. The angular accuracy evaluation algorithm process is as follows: 1) According to each test position, calculate the theoretical measurement phase difference of the point ψ=ksinξ 2) According to the measured data, the azimuth phase difference of each test is solved as ψ m , the pitch angle phase difference is ψ m =arg(m2 / m4) 3) Calculation of measurement target position: Target measurement position: Measurement error: In S5, the theoretical measured phase difference ψ of this point is calculated, Style ψ=ksinξ Middle: d is the distance between the two antennas of the calibration device; λ is the test signal wavelength λ = c / f; is the target pitch phase difference of the theoretical trajectory; ψ is the target azimuth phase difference of the theoretical trajectory; ξ is the theoretical target azimuth; ζ is the theoretical target pitch angle; In S5, the azimuth phase difference of each test is solved according to the measured data as ψ m , the pitch angle phase difference is Mode ψ m =arg(m2 / m4) Where arg(·) represents the phase angle of the complex number, and m1~m4 are the complex data received by the four receiving antennas of the calibration equipment. Take the azimuth angle as an example, the same is true for the elevation angle; ψ si =ψ mi -ψ i ψ si =ψ mi -ψ s0 ψ si After normalization to the range of [-π, π], it becomes ψ' si y'' si =ψ' si -ψ' ave And calculate in the same way The S5 is the azimuth phase difference and elevation phase difference after phase compensation.

2. The method for verifying the angular accuracy of a radio frequency simulation array according to claim 1, characterized in that: The switch in S3 is switched by the network port command of the control panel.

3. The method for verifying the angular accuracy of a radio frequency simulation array according to claim 1, characterized in that: The hardware architecture includes 4 receiving antennas, a single-pole multi-throw switch RF switch, a control board and a vector network analyzer. The host computer software is connected to the control board through the network port. After sending the control command, the single-pole multi-throw switch is turned on to the corresponding antenna. At the same time, the host computer software obtains the amplitude, phase, and IQ data of the corresponding frequency point by controlling the vector network analyzer, and uses the angular accuracy evaluation algorithm to solve this data to obtain the measured value of the angular accuracy evaluation.

4. The method for verifying the angular accuracy of a radio frequency simulation array according to claim 3, characterized in that: The single-pole multi-throw switch and four receiving antennas together constitute a calibration device.

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