Antenna phase center automatic test system and method

Abstract

The invention provides an antenna phase center automatic test system and method. The antenna phase center test efficiency is improved. The system comprises a transmitting antenna and a tested antenna which are respectively fixed on a scanning frame and a rotary table, the scanning frame and the rotary table are respectively connected with a scanning frame controller and a rotary table controller, and optical targets are respectively fixed on the transmitting antenna and the tested antenna; the laser tracker is arranged between the transmitting antenna and the tested antenna and is used for acquiring the horizontal angle, the rotation angle and the distance information of the optical targets on the transmitting antenna and the tested antenna, so that the centers of the aperture surfaces of the transmitting antenna and the tested antenna are aligned; the vector network analyzer is used for measuring amplitude information and phase information of a transmitting antenna and a measured antenna by sending a signal with a known frequency; and the main control computer is connected with the scanning frame controller, the rotary table controller and the vector network analyzer and is used for controlling the scanning frame controller and the rotary table controller, receiving measurement data of the vector network analyzer and determining the phase center of the tested antenna.

Description

Technical Field

[0001] The present application relates to the technical field of instrument testing, and in particular to an automatic testing system and method for an antenna phase center. Background Art

[0002] The phase center of an antenna is its equivalent radiation center. An ideal antenna has a unique phase center, and its equiphase surface is a sphere. Therefore, when receiving signals from different directions, there will be no deviation in the positioning measurement results due to the additional phase difference generated by the antenna itself. However, usually the phase center of the antenna only maintains a relatively constant phase within a certain range of the main lobe. At this time, the receiving antenna will introduce additional phase differences when receiving signals from different directions, thereby generating positioning measurement errors. With the development of communications, radar, artificial satellites and aerospace technology, the requirements for antenna tracking and positioning accuracy are becoming higher and higher. The stability of the phase center of the antenna and the phase in the far field of radiation have important research value and application significance in phase measurement, beam tracking and precise positioning. Therefore, the deviation of the phase center cannot be ignored. By studying the phase center measurement method, accurately measuring the position of the antenna phase center and correcting the deviation value, the antenna positioning accuracy can be improved and the performance of the system can be guaranteed.

[0003] However, the existing phase center measurement method based on moving reference points is to analyze the position of the reference point through the phase information collected each time, and then move the reference point to gradually approach the center position. The measurement process requires repeated movement of the reference point, which is time-consuming and labor-intensive, prone to accidental errors, and has low efficiency. In addition, the moving reference point method only calculates and analyzes the phase center position in a single direction (or plane), which is a huge workload and time-consuming and labor-intensive.

[0004] Therefore, how to design a more efficient phase center test system, improve the test and calculation efficiency of the test system, and reduce labor costs is a problem that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present application provide an antenna phase center automatic testing system and method, which effectively improves the efficiency of antenna phase center testing and the confidence of measurement data, reduces interference introduced by manual successive adjustments, and can effectively avoid human operational errors, reduce testing risks, greatly shorten test time, and improve test efficiency.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides an antenna phase center automatic test system, the system comprising: a main control computer, a transmitting antenna, a scanning frame, a scanning frame controller, an antenna to be tested, a turntable, a turntable controller, a laser tracker and a vector network analyzer;

[0008] The transmitting antenna and the antenna under test are fixed on a scanning frame and a turntable, respectively. The scanning frame and the turntable are connected to a scanning frame controller and a turntable controller, respectively. An optical target is also fixed on the transmitting antenna and the antenna under test, respectively.

[0009] A laser tracker is arranged between the transmitting antenna and the antenna under test, and is used to obtain the horizontal angle, rotation angle and distance information of the optical target on the transmitting antenna and the antenna under test, so as to align the aperture centers of the transmitting antenna and the antenna under test;

[0010] Vector network analyzer, used to measure the amplitude and phase information of the transmitting antenna and the antenna under test by sending a signal of known frequency;

[0011] The main control computer is connected with the scanning frame controller, the turntable controller and the vector network analyzer, and is used for controlling the scanning frame controller and the turntable controller and receiving the measurement data of the vector network analyzer, so as to determine the phase center of the antenna under test.

[0012] In a possible design scheme, the system of the first aspect also includes that the scanning frame is a high-precision electric linear slide KSA-800-11-X.

[0013] In a possible design scheme, the system of the first aspect also includes that the turntable is a high-precision electrically controlled turntable RAK-200.

[0014] In a possible design scheme, the system of the first aspect also includes that the scanning frame controller and the turntable controller use a USB1020 motion control card.

[0015] A possible design scheme, the system of the first aspect also includes that the main control computer uses test software developed based on LabVIEW to receive and process measurement data of the vector network analyzer in real time and analyze the phase center of the antenna under test.

[0016] In a second aspect, the present application provides an antenna phase center automatic testing method, the method comprising: a tester obtains horizontal angle, rotation angle and distance information of optical targets on a transmitting antenna and an antenna under test through a laser tracker, and the tester moves a scanning frame controller of the transmitting antenna and a turntable controller of the antenna under test based on the horizontal angle, rotation angle and distance information to align the aperture centers of the transmitting antenna and the antenna under test;

[0017] The main control computer determines the initial reference position of the phase center of the antenna under test by using the three-point method, and sets the first scanning interval and the first step;

[0018] The main control computer obtains the first phase information and the first amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, and obtains a first phase direction diagram;

[0019] The main control computer determines the beam width of the antenna under test based on the first phase pattern;

[0020] The main control computer sets a second scanning interval and a second step based on the initial reference position and the beam width of the antenna under test;

[0021] The main control computer obtains the second phase information and the second amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, and obtains a second phase direction diagram;

[0022] The main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase radiation pattern, and if it is within the preset range, the phase center of the antenna under test is calculated.

[0023] In a possible design scheme, the method of the second aspect further includes that the first scanning interval is set to -90° to 90°.

[0024] In a possible design scheme, the method of the second aspect also includes that the range of the second scanning interval is at least 6° wider than the beam width of the antenna under test.

[0025] A possible design scheme, the method of the second aspect also includes that the first step and the second step are set to 1°.

[0026] In a possible design scheme, the method of the second aspect further includes: the main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase direction diagram, and if it is not within the preset range, the main control computer determines the direction and movement interval of the mobile turntable controller based on the second phase direction diagram;

[0027] The main control computer controls the turntable controller to move based on the direction and the moving interval, and obtains the third phase information and the third amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, to obtain a third phase direction diagram;

[0028] The main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase radiation pattern, and if it is within the preset range, the phase center of the antenna under test is calculated.

[0029] In the embodiment of the present application, the antenna phase center automatic test system is used to realize functions such as automatic data collection, automatic calculation of the initial moving reference point, automatic adjustment of the position of the antenna rotation center axis, and adjustment of the direction and size of the antenna step, thereby avoiding the time-consuming and labor-intensive problems of multiple data analysis and single-step adjustment during manual testing. The system test process is simple and efficient, avoiding a series of problems such as cumbersome testing in traditional testing, and manual testing that easily causes misoperation and operation errors, reducing test risks, shortening test time, and greatly improving test efficiency.

[0030] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A system schematic diagram of an antenna phase center automatic testing system provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the high-precision electric linear slide KSA-800-11-X provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the high-precision electric rotary table RAK-200 provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of a flow chart of an automatic antenna phase center testing method provided in an embodiment of the present application;

[0036] Figure 5 This is a schematic diagram of the moving reference point method;

[0037] Figure 6 A schematic diagram of antenna coordinates provided in an embodiment of the present application;

[0038] Figure 7 A phase direction reference diagram provided for an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. At the same time, in the description of the embodiments of the present application, the terms "first", "second", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] Figure 1A system diagram of an antenna phase center automatic test system provided in an embodiment of the present application. Based on this system, the efficiency of antenna phase center testing and the confidence of measurement data can be effectively improved, the interference introduced by manual adjustment can be reduced, and human operation errors can be effectively avoided, the test risk can be reduced, the test time can be greatly shortened, and the test efficiency can be improved.

[0041] The antenna phase center automatic test system specifically includes: a main control computer, a transmitting antenna, a scanning frame, a scanning frame controller, a tested antenna, a turntable, a turntable controller, a laser tracker and a vector network analyzer.

[0042] The transmitting antenna and the antenna under test are fixed on a scanning frame and a turntable, respectively. The scanning frame and the turntable are connected to a scanning frame controller and a turntable controller, respectively. An optical target is also fixed on the transmitting antenna and the antenna under test, respectively.

[0043] A laser tracker is arranged between the transmitting antenna and the antenna under test, and is used to obtain the horizontal angle, rotation angle and distance information of the optical target on the transmitting antenna and the antenna under test, so as to align the aperture centers of the transmitting antenna and the antenna under test;

[0044] Vector network analyzer, used to measure the amplitude and phase information of the transmitting antenna and the antenna under test by sending a signal of known frequency;

[0045] The main control computer is connected with the scanning frame controller, the turntable controller and the vector network analyzer, and is used for controlling the scanning frame controller and the turntable controller and receiving the measurement data of the vector network analyzer, so as to determine the phase center of the antenna under test.

[0046] Among them, the transmitting antenna is installed on the above-mentioned scanning frame. The scanning frame in this application can be Figure 2 The high-precision electric linear slide KSA-800-11-X shown in the figure adopts full closed-loop control, has manual control and automatic control functions, and is stable and reliable. The scanning frame has a repeat positioning accuracy of ±0.03mm in the horizontal and vertical axes, and the straightness of the guide rail is 0.5mm, which can fully meet the basic requirements of the antenna phase center test system. The above scanning frame is only an example, and other models of scanning frames can also be used, which is not limited here.

[0047] The antenna under test is installed on the turntable, the mechanical pointing of the antenna under test in space is precisely changed, and the relative position between the antenna under test and the rotating shaft is adjusted so that the phase center of the antenna is as close as possible to the rotating axis of the test turntable. Figure 3 The high-precision electric-controlled rotary stage RAK-200 shown has a repeat positioning accuracy of less than 0.005° and adopts a worm gear transmission mechanism, and can rotate within an arbitrary range of ±360° around the azimuth axis.

[0048] Among them, the above-mentioned scanning frame controller and turntable controller both use USB1020 motion control card, which is a four-axis servo or stepper motor motion control card. Each controlled axis can move independently, can also perform multi-axis synchronous motion, and can also perform any two-axis or any three-axis motion. In addition, USB1020 contains a powerful software driver library that supports secondary programming in multiple language environments. When using the program, you only need to call the functions in the software library, which simplifies program development. At the same time, USB1020 is easy to operate. During use, you only need to use a USB cable to connect the control computer to USB1020, and you can use USB1020 to control the motion of the device, which is plug-and-play. In addition, USB1020 also supports the reading of real-time motion data, has strong human-computer interactivity, is easy to connect to various network interfaces, and is suitable for remote operation.

[0049] The laser tracker can perform real-time tracking and measure three-dimensional coordinates. It has the characteristics of simple operation, good stability and high measurement accuracy. The laser tracker tracks the fixed targets on the transmitting antenna and the antenna under test, obtains the horizontal angle, pitch angle and distance information of the measurement target, and realizes the alignment of the center of the transmitting antenna and the antenna under test.

[0050] The control card of the vector network analyzer can be NI GPIB-USB-HS, or the network port can be selected according to the interface of the network analyzer used, and the command data can be converted into information that conforms to the communication protocol using a standard protocol converter, so as to operate the intelligent measuring instrument used and achieve the purpose of intelligent measurement and control. The vector network analyzer can measure the amplitude and phase of the antenna under test. After that, the computer reads the measurement data of the vector network analysis, draws the antenna pattern through the software, and analyzes the offset of the phase center.

[0051] The main control computer can be a portable notebook computer or a desktop computer, and the test software developed based on LabVIEW can receive and process the measurement data of the vector network analyzer in real time to analyze the phase center of the antenna under test.

[0052] It should be noted that the above-mentioned model limitations on the scanning frame, turntable, scanning frame controller and turntable controller, laser tracker, vector network analyzer, and main control computer are only examples. In specific applications, the appropriate model can be selected according to actual conditions, and no specific restrictions are made here.

[0053] Combination of the above Figure 1-Figure 3 The antenna phase center automatic test system provided by the embodiment of the present application is described in detail. Figure 4-Figure 7 An antenna phase center automatic testing method using the above antenna phase center automatic testing system is introduced.

[0054] The process of the antenna phase center automatic test method is as follows:

[0055] In step S101, the tester obtains the horizontal angle, rotation angle and distance information of the optical targets on the transmitting antenna and the antenna under test through a laser tracker. Based on the horizontal angle, rotation angle and distance information, the tester moves the scanning frame controller of the transmitting antenna and the turntable controller of the antenna under test to align the centers of the apertures of the transmitting antenna and the antenna under test.

[0056] It can be understood that the antenna under test and the transmitting antenna are fixed on the turntable and the scanning frame respectively. The antenna under test and the transmitting antenna are fixed with an optical target respectively, and the optical target can move with the antenna. The laser tracker is used to obtain the horizontal angle, rotation angle and distance information of the optical target through two high-precision code disks and interferometric ranging modules respectively. According to the relative position of the optical target, the center of the two antennas is aligned by moving the scanning frame.

[0057] In step S102, the main control computer determines the initial reference position of the phase center of the antenna under test by using the three-point method, and sets the first scanning interval and the first step.

[0058] Before executing step S102, the main control computer sets the equipment parameters and then performs the initial antenna scan, using the three-point method to determine the initial reference position of the phase center of the antenna under test.

[0059] The three-point method is used to calibrate the initial reference point position of the antenna. The following principle can be used as a reference. Figure 5 and Figure 6 understand.

[0060] For a source radiating an ideal spherical wave, its far-field phase direction function can be written as:

[0061]

[0062] In formula (1), k is the wave number, Δ x , Δ y , Δ z is the offset between the phase center and the reference point after a given reference point, and C is the phase constant. If the reference point is set to (0, 0, 0), then the phase center coordinates are (Δ x , Δ y , Δ z ). At this time, the unknown number is Δ x , Δ y , Δ z and the four Cs. and In a special case, assuming that only the two-dimensional phase centers within the two cross sections need to be calibrated, then only the phase patterns on the two surfaces need to be measured, and sin0°=cos90°. Substituting into equation (1), the equation can be simplified to:

[0063]

[0064] when When Δ t is Δ x ,when When , the corresponding t is Δ y At this time, there are only three unknowns. As long as the three far-field phases at different angles are measured, this equation can be solved to obtain the coordinates of the phase center.

[0065] Usually, the three angles are selected as the upper and lower limits of the maximum beam pointing and the angle within the measured beam, so this is also called the three-point method. Assume that the three angles have been measured at the angular position θ 1 ,θ 2 and θ 3 The phase values ​​(in radians) at 1 , Φ 2 and Φ 3 . This system can solve Δ t , Δ z and C.

[0066] Φ 1 =k 0 (Δ t sinθ 1 +Δ z cosθ 1 )+C

[0067] Φ 2 =k 0 (Δ t sinθ 2 +Δ z cosα 2 )+C

[0068] Φ 3 =k 0 (Δ t sinθ 3 +Δ z cosθ 3 )+C (3)

[0069] Therefore, the C value given by formula (3) is

[0070] C=Φ 2 -k 0 (Δ tsin θ 2 +Δ z cos θ 2 ) (4)

[0071] A simple transformation of (3) is:

[0072] Φ 2 -Φ 1 =k 0 [Δ t (sin θ 2 -sin θ 1 )+Δ z (cos θ 2 -cos θ 1 )]

[0073] Φ 2 -Φ 3 =k 0 [Δ t (sin θ 2 -sin θ 3 )+Δ z (cos θ 2 -cos θ 3 )] (5)

[0074] Solving equation (5) yields the desired Δ t , Δ z for:

[0075]

[0076] In summary, in three directions Φ 1 , Φ 2 and Φ 3 , respectively (θ 1 ,Φ),(θ 2 ,Φ),(θ 3 , Φ) in the fixed Φ value radiation pattern phase measurement, the phase constant C, the axial phase center displacement Δ z , lateral phase center displacement Δ t (within the measurement plane) can be determined by equations (4) and (6).

[0077] Based on the data obtained above, the initial reference position of the antenna under test can be calculated by the main control computer.

[0078] At the same time, it is also necessary to set the first scanning interval (-θ, θ). In order to obtain comprehensive antenna amplitude and phase information, the scanning interval can be selected as (-90°, 90°), that is, the first scanning interval is set to -90° to 90°. And set the first step, generally 1° step rotation antenna to collect phase and amplitude information.

[0079] Step S103: The main control computer acquires the first phase information and the first amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, and obtains a first phase direction diagram.

[0080] Step S104: The main control computer determines the beam width of the antenna under test based on the first phase pattern.

[0081] It is understood that the main control computer can identify the half-power point of the antenna under test (i.e., the position where the power drops to half of the maximum value). The angle difference between these points is the beam width of the antenna. For example, if in the first phase pattern, the two angles where the radiation power of the antenna under test drops to half of the maximum value are +θ and +θ respectively. 3dB and -θ 3dB , then the beam width is 2θ 3dB .

[0082] Step S105: The main control computer sets a second scanning interval and a second step based on the initial reference position and the beam width of the antenna under test.

[0083] The range of the second scanning interval is at least 6° wider than the beam width of the antenna under test, that is, the second scanning interval is (-θ 3dB -3°, θ 3dB +3°), the second step value is generally 1°

[0084] Step S106, the main control computer obtains the second phase information and the second amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, and obtains a second phase direction diagram.

[0085] The second phase direction diagram obtained by the main control computer is as follows Figure 7 shown.

[0086] Step S107: The main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase radiation pattern. If it is within the preset range, the phase center of the antenna under test is calculated.

[0087] Understandably, if Figure 7 If the phase change in the phase pattern shown is within a preset range, such as within a 2° range, the main control computer directly calculates the phase center of the antenna under test.

[0088] It should be noted that the above method further includes step S108: if it is not within the preset range, the main control computer determines the direction and movement interval of the mobile turntable controller based on the second phase direction diagram.

[0089] by Figure 7 The four phase directional diagrams are used as an example, as follows:

[0090] Case 1: If Figure 7 As shown in (a), when the antenna phase center deviates from the center of the turntable along the Z-axis direction, it is offset in the Z-axis direction. Curve 1 shows that the rotation axis deviates to the Z-direction, and the turntable rotation axis needs to be adjusted to move in the Z+ direction; Curve 2 shows that the rotation axis deviates to the Z+ direction, and the turntable rotation axis needs to be adjusted to move in the Z-direction.

[0091] Case 2: If Figure 7 As shown in (b), when the X-axis of the antenna phase center deviates from the center of the turntable, that is, it deviates in the X-axis direction. Curve 3 shows that the rotation axis deviates to the X-direction, and the turntable rotation axis is adjusted to move in the X+ direction; Curve 4 shows that the rotation axis deviates to the X+ direction, and the turntable rotation axis is adjusted to move in the X-direction.

[0092] Case 3: If Figure 7 (c) and Figure 7 As shown in (d), when the antenna phase center is offset in both the X and Y directions, the axis deviates from the center of the turntable. Curve 5 shows that the rotation axis deviates to the X-Z+ direction, and curve 6 shows that the rotation axis deviates to the X+Z+ direction. Curve 7 shows that the rotation axis deviates to the X+Z- direction, and curve 8 shows that the rotation axis deviates to the XZ- direction.

[0093] Based on this, the main control computer will determine the direction and movement interval of the mobile turntable controller as follows:

[0094] according to Figure 7 middle, The phase information of the three points is used to adjust the rotation axis of the turntable in sequence according to the following steps;

[0095] 1. When When the X+ direction is moved step by step in 0.5mm increments, Move gradually in the X-direction in steps of 0.5 mm until The phase difference of the three points is within 5°.

[0096] 2. When Move gradually in the Z+ direction in 1mm steps. Move gradually in the Z-direction in 1mm steps until The phase difference of the three points is within 5°;

[0097] 3. When Move gradually in the X-direction in steps of 0.5 mm. Move gradually in the X+ direction in steps of 0.5 mm until The phase difference of the three points is within 5°;

[0098] 4. When Indicates the maximum phase value in the (-θ, θ) interval, and moves gradually in the X+ direction in steps of 0.5 mm. Move step by step in the X-direction in 0.5 mm increments.

[0099] 5. When When the difference is less than 5°, repeat 1 to 4 steps of 0.2mm in the X-axis direction and 0.5mm in the Z-axis direction until The maximum phase difference within the interval is less than 2°. At this time, the adjusted rotation center can be considered to be approximately the phase center of the antenna.

[0100] It can be understood that, usually, since the deviation of the antenna phase center in the X-axis direction is much smaller than that in the Z-axis direction, the X-axis is adjusted in 0.5mm steps and the Z-axis is adjusted in 1mm steps for coarse adjustment. When the phase fluctuation is within the range of 5°, select the X-axis to be adjusted in 0.2mm steps and the Z-axis to be adjusted in 0.5mm steps until the phase fluctuation is within the range of 2°. The distance from the center of the rotation axis to the antenna aperture is calculated, which is the phase center of the antenna.

[0101] Step S109: the main control computer controls the turntable controller to move based on the direction and the moving interval, and obtains the third phase information and the third amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, to obtain a third phase direction diagram.

[0102] Step S110: The main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase pattern, and if so, calculates the phase center of the antenna under test. If not, continue to loop through steps S108 to S110.

[0103] In summary, the embodiment of the present application realizes functions such as automatic data collection, automatic calculation of the initial moving reference point, automatic adjustment of the position of the antenna rotation center axis, and adjustment of the direction and size of the antenna step through the antenna phase center automatic test system, thus avoiding the time-consuming and labor-intensive problems of multiple data analysis and single-step adjustment during manual testing. The system test process is simple and efficient, avoiding a series of problems such as cumbersome testing in traditional testing, and manual testing that is prone to misoperation and operational errors, reducing test risks, shortening test time, and greatly improving test efficiency.

[0104] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences between it and other embodiments.

[0105] The above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the specific order or sequential order shown in the process depicted in the drawings is not necessarily required to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0106] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An antenna phase center automatic test system, characterized in that: The system comprises: a main control computer, a transmitting antenna, a scanning frame, a scanning frame controller, an antenna to be tested, a turntable, a turntable controller, a laser tracker and a vector network analyzer; The transmitting antenna and the antenna under test are fixed on the scanning frame and the turntable, respectively. The scanning frame and the turntable are connected to the scanning frame controller and the turntable controller, respectively. An optical target is also fixed on the transmitting antenna and the antenna under test, respectively. The laser tracker is arranged between the transmitting antenna and the antenna under test, and is used to obtain the horizontal angle, rotation angle and distance information of the optical target on the transmitting antenna and the antenna under test, so as to align the aperture centers of the transmitting antenna and the antenna under test; The vector network analyzer is used to measure the amplitude information and phase information of the transmitting antenna and the antenna under test by sending a signal of a known frequency; The main control computer is connected to the scanning frame controller, the turntable controller and the vector network analyzer, and is used to control the scanning frame controller and the turntable controller, and receive measurement data from the vector network analyzer, thereby determining the phase center of the antenna under test.

2. The antenna phase center automatic test system according to claim 1, characterized in that: The scanning frame is a high-precision electric linear slide KSA-800-11-X.

3. The antenna phase center automatic test system according to claim 1, characterized in that: The turntable is a high-precision electric-controlled turntable RAK-200.

4. The antenna phase center automatic testing system according to claim 1, characterized in that: The scanning frame controller and the turntable controller adopt USB1020 motion control card.

5. The antenna phase center automatic testing system according to claim 1, characterized in that: The main control computer adopts the test software developed based on LabVIEW to receive and process the measurement data of the vector network analyzer in real time and analyze the phase center of the antenna under test.

6. An antenna phase center automatic testing method, applied to an antenna phase center automatic testing system as claimed in any one of claims 1 to 5, characterized in that: The method comprises: The tester obtains the horizontal angle, rotation angle and distance information of the optical targets on the transmitting antenna and the antenna under test through a laser tracker. Based on the horizontal angle, rotation angle and distance information, the tester moves the scanning frame controller of the transmitting antenna and the turntable controller of the antenna under test to align the aperture centers of the transmitting antenna and the antenna under test; The main control computer determines the initial reference position of the phase center of the antenna under test by using the three-point method, and sets the first scanning interval and the first step; The main control computer acquires the first phase information and the first amplitude information collected by the vector network analyzer based on the second scanning interval and the second step to obtain a first phase direction diagram; The main control computer determines the beam width of the antenna under test based on the first phase pattern; The main control computer sets a second scanning interval and a second step based on the initial reference position and the beam width of the antenna under test; The main control computer acquires the second phase information and the second amplitude information collected by the vector network analyzer based on the second scanning interval and the second step to obtain a second phase direction diagram; The main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase pattern, and if so, calculates and obtains the phase center of the antenna under test.

7. The method for automatically testing the antenna phase center according to claim 1, characterized in that: The first scanning interval is set to -90° to 90°.

8. The method for automatically testing the antenna phase center according to claim 1, characterized in that: The range of the second scanning interval is at least 6° wider than the beam width of the antenna under test.

9. The method for automatically testing the antenna phase center according to claim 1, characterized in that: The first step and the second step are set to 1°.

10. The method for automatically testing the antenna phase center according to claim 1, characterized in that: The method further includes: the main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase direction diagram, and if not within the preset range, the main control computer determines the direction and movement interval of moving the turntable controller based on the second phase direction diagram; The main control computer controls the turntable controller to move based on the direction and the moving interval, and obtains the third phase information and the third amplitude information collected by the vector network analyzer based on the second scanning interval and the second step, to obtain a third phase direction diagram; The main control computer determines whether the phase change in the second phase information is within a preset range based on the second phase pattern, and if so, calculates and obtains the phase center of the antenna under test.

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