Spatial position alignment test system and use method for radar testing

Abstract

The present invention discloses a spatial position alignment test system and a method for using the radar test. Two plane beam splitters are provided to form two light spots on a ruler, and the actual coordinates of the center points of the light spots are determined. Then, the actual tilt angle of the plane beam splitter and the offset angle of the end face of the radar to be tested are calculated by the plane mirror reflection principle, and the turntable is controlled to rotate to achieve accurate alignment between the radar to be tested and the laser. The spatial position alignment system does not need to strictly limit the tilt angle of the first plane beam splitter, but calculates and determines the tilt angle of the first plane beam splitter through the collected light spot coordinates, which can effectively reduce the installation difficulty of each component in the system, eliminate the angle deviation caused by mechanical installation or mirror processing of the plane beam splitter, and effectively improve the alignment accuracy of the alignment system.

Description

Technical Field

[0001] The present invention relates to the field of radar testing technology, and in particular to a system and method for spatially aligning a radar with a testing instrument when measuring or calibrating the spatial angle measurement accuracy of the radar. Background Art

[0002] When testing millimeter-wave radar and laser radar, the radar to be tested needs to be fixed on a turntable at one end of the microwave dark box, and the optical test instrument needs to be fixed at the other end of the dark box. In order to accurately measure and calibrate the spatial angle measurement accuracy of the radar, the initial position of the radar is required to be directly opposite the end face of the optical test instrument, that is, the normal of the radar to be tested is parallel to the normal of the end face of the optical instrument. The longitudinal dimension of the dark box is relatively long, usually exceeding 3 meters, and the processing and assembly accuracy of the fixtures for fixing radars and optical instruments is limited. Therefore, it is difficult to ensure that the turntable is aligned with the optical instrument at an angle of 0°. Therefore, a special alignment test device is required to complete the initial position alignment test of the radar and the test instrument, determine whether the radar and the test instrument are aligned, and use the alignment test device to align and correct the initial position of the radar and the test instrument.

[0003] The commonly used initial position alignment test method is the angle measurement alignment based on the principle of optical collimation. It requires that the light source of the test instrument is located at the focus of the collimating lens and is set between the test instrument and the radar. The angle with the optical axis is required to be precisely 45 degrees. In the actual measurement process, the focal length of the convex lens is easily affected by the machining surface error, and it is difficult to ensure that the test instrument can be accurately located at the focus of the convex lens. The matching clearance of the lens fixture will affect the position of the optical axis. In addition, it is difficult to achieve complete accuracy in the actual installation and adjustment when the angle with the optical axis is precisely 45°. These will greatly affect the alignment accuracy of the radar and the test design, and then affect the measurement accuracy of the radar. In addition, when the radar is performing an angle measurement test, the angle is usually adjusted by rotating the lens on the test radar, but when performing a small angle test, it is difficult to achieve the angle accuracy condition by adjusting the lens. Therefore, it is necessary to further improve the existing alignment method and system of radar and optical test instruments. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a system which is easy to operate and can realize accurate alignment of the position of a radar to be tested and a laser in view of the deficiencies in the prior art.

[0005] A spatial position alignment test system for radar testing, comprising a laser, the laser being used to emit a laser beam in a horizontal direction; a radar to be tested, the radar to be tested being arranged on a turntable, the turntable being able to drive the radar to be tested to rotate, a plane reflector being fixedly mounted on the end face of the radar to be tested, the plane reflector being opposite to the laser; a first plane beam splitter, the first plane beam splitter being arranged between the laser and the radar to be tested, the first plane beam splitter being arranged obliquely to a horizontal plane, and both the front and back surfaces of the first plane beam splitter being beam splitting surfaces; a second plane beam splitter, the second plane beam splitter being arranged between the first plane beam splitter and the radar to be tested, the second plane beam splitter being arranged perpendicularly to a horizontal plane, and both the front and back surfaces of the second plane beam splitter being beam splitting surfaces. The invention relates to a surface; a ruler, which is located at one side of the first plane beam splitter, and is a semi-transparent ruler with scales, and is arranged in parallel with the central axis of the laser emitting end face; a CCD camera, which is arranged at one side of the ruler, and is used to photograph the light spot on the ruler; a control unit, which is connected to the CCD camera and the turntable, and includes an image processing module, an inclination angle calculation module and a turntable rotation angle control module, and the image processing module is used to determine the coordinates of the center position of the light spot according to the light spot image collected by the CCD camera; the inclination angle calculation module is used to calculate the inclination angle of the first plane beam splitter, and the turntable rotation angle control module is used to calculate the angle at which the turntable needs to rotate and control the rotation of the turntable.

[0006] Preferably, the inclination angle calculation module calculates the inclination angle of the first plane beam splitter using the following formula:

[0007] , where α is the inclination angle of the first plane beam splitter, R is the distance between the first plane beam splitter and the central axis of the laser along the laser emission end face, H is the ordinate of the center point M of the first light spot formed on the ruler by the laser beam reflected by the second plane beam splitter and the first plane beam splitter, and Xc is the abscissa of the center point M of the first light spot.

[0008] The turntable rotation angle control module calculates the angle that the turntable needs to rotate using the following formula

[0009] , where α is the inclination angle of the first plane beam splitter, L1 is the distance between the first plane beam splitter and the plane reflector along the central axis of the laser emission end face, R is the distance between the first plane beam splitter and the laser along the central axis of the laser emission end face, H is the ordinate of the center point N of the second light spot formed by the laser beam reflected by the plane reflector and the first plane beam splitter on the ruler, Xd is the abscissa of the center point N of the second light spot, and β1 is twice the rotation angle of the turntable.

[0010] Preferably, it further comprises a stand, which is horizontally arranged, and the laser, the radar to be measured, the first plane spectroscope, and the second plane spectroscope are all arranged on the stand.

[0011] Preferably, it also includes a shell, wherein the laser, the first plane beam splitter, the second plane beam splitter, the CCD camera, and the ruler are all located in the shell, the CCD camera is arranged on the top of the shell, the laser is arranged on the side wall of the shell, and the side wall of the shell is arranged perpendicular to the stand.

[0012] The present invention also discloses a method for using the above-mentioned spatial position alignment test system for radar testing, comprising the following steps: step 1: a laser emits a horizontal laser beam, the laser beam is sequentially transmitted through a first plane beam splitter, reflected by a second plane beam splitter, and reflected by the first plane beam splitter along an optical path to form a first light spot on the ruler; the laser beam is sequentially transmitted through the first plane beam splitter, transmitted by a second plane beam splitter, reflected by a plane reflector, transmitted by the second plane beam splitter, and reflected by the first plane beam splitter along an optical path to form a second light spot on the ruler; step 2: a CCD camera is used to capture images of the first light spot and the second light spot, and the light spot images are imaged. Processing, determine the coordinates of the center point M of the first light spot as (Xc, H), and the coordinates of the center point N of the second light spot as (Xd, H); Step 3: Calculate the actual inclination angle α of the first plane beam splitter and the horizontal plane according to the coordinate value of the center point M of the first light spot and the distance R between the first plane beam splitter and the laser along the central axis of the laser emission end face; Step 4: Calculate the deflection angle β1 of the plane reflector reflection line according to the calculated value of the inclination angle α, the distance L1 between the plane reflector and the first plane beam splitter along the central axis of the laser emission end face, and the coordinate value of the center point N of the second light spot; Step 5: Control the turntable to rotate in the opposite direction of the deflection direction of the plane reflector reflection line , complete the alignment of the plane reflector and the laser on the radar to be tested.

[0013] Preferably, the first light spot and the second light spot have different brightness.

[0014] Preferably, the calculation formula of the inclination angle α between the first plane beam splitter and the horizontal plane in step 3 is:

[0015] , where α is the inclination angle of the first plane beam splitter, R is the distance between the first plane beam splitter and the central axis of the laser along the laser emission end face, H is the ordinate of the center point M of the first light spot, and Xc is the abscissa of the center point M of the first light spot.

[0016] Preferably, the calculation formula of the deflection angle β1 of the reflected light of the plane reflector in step 4 is:

[0017] , where α is the inclination angle of the first plane beam splitter, L1 is the distance between the first plane beam splitter and the plane reflector along the central axis of the laser emission end face, H is the ordinate of the center point N of the second light spot, and Xd is the abscissa of the center point N of the second light spot.

[0018] The above scheme has the following beneficial effects: the high-precision spatial position alignment test system is provided with two plane beam splitters, and the light spot reflected by the plane beam splitter on the scale is collected by a CCD camera and the coordinates of the center point of the light spot are determined, and the actual tilt angle of the first plane beam splitter and the offset angle of the end face of the radar to be tested are calculated by the principle of light reflection, and the radar to be tested and the laser can be accurately aligned by controlling the rotation of the turntable. The alignment system does not need to strictly limit the tilt angle of the first plane beam splitter, but calculates and determines the tilt angle of the first plane beam splitter by the collected light spot coordinates, which can effectively reduce the difficulty of installing each component in the system, eliminate the angle deviation and system deviation caused by mechanical installation or mirror processing of the plane beam splitter, and effectively improve the alignment accuracy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the system structure of an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the optical path structure of an embodiment of the present invention.

[0021] Figure 3 The present invention is a flowchart of a method for implementing the present invention.

[0022] Component number explanation: 1. Laser; 2. Radar to be tested; 3. First plane beam splitter; 4. Second plane beam splitter; 5. Plane reflector; 6. CCD camera; 7. Stand; 8. Shell; 9. Scale; 10 Turntable; 11 Support frame; 12. Support frame; 13. Support frame. DETAILED DESCRIPTION

[0023] The following is an explanation of the disclosed embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0024] like Figure 1As shown, the present invention discloses a spatial position alignment test system for radar testing, which includes a laser 1 and a radar 2 to be tested which is located opposite to the laser 1, and the laser 1 is used to emit a laser beam in the horizontal direction. The radar 2 to be tested is arranged on a turntable 10, and the end face of the radar 2 to be tested can be rotated to a specified angle by controlling the rotation of the turntable 10. A plane reflector 5 is fixedly mounted on the end face of the radar 2 to be tested, and the plane reflector 5 can rotate together with the end face of the radar to be tested, and the plane reflector 5 is located opposite to the laser emitting end face of the laser 1.

[0025] A first plane beam splitter 3 is provided between the laser 1 and the radar 2 to be tested. The first plane beam splitter 3 is tilted with respect to the horizontal plane. Both the front and back surfaces of the first plane beam splitter 3 are beam splitters. The beam splitters can split the incident light into two beams, namely, the transmitted light and the refracted light. That is, after the light beam is irradiated to the beam splitter, a part of the light beam can be transmitted through the mirror surface, and the other part of the light beam is reflected by the beam splitter. The transmission and refraction ratio of the beam splitter can be set. A second plane beam splitter 4 is also provided between the first plane beam splitter 3 and the radar 2 to be tested. The second plane beam splitter 4 is vertically arranged with respect to the horizontal plane. Both the front and back surfaces of the second plane beam splitter 4 are also beam splitters. Along the central axis of the laser emission end face of the laser 1, the distance between the first plane beam splitter 3 and the laser 1 is R, and the distance between the plane reflector 5 and the first plane beam splitter 3 is L1.

[0026] A scale 9 is provided on the upper side of the first plane beam splitter 3. The scale 9 is a semi-transparent scale with scales. The scale 9 is arranged parallel to the central axis of the laser emitting end face of the laser. The distance between the scale 9 and the central axis of the laser emitting end face is H. For the convenience of observation, the 0 scale on the scale 9 can be made to coincide with the end face of the laser 1 in the horizontal direction. A CCD camera 6 is provided above the scale 9. The CCD camera 6 is used to photograph the light spot of the scale 9. The laser beam emitted by the laser 1 is transmitted through the first plane beam splitter 3, reflected by the second plane beam splitter 4, and reflected by the first plane beam splitter 3 along the optical path to form a first light spot on the scale. The laser beam is transmitted through the first plane beam splitter 3, the second plane beam splitter 4, the plane reflector 5, the second plane beam splitter 4, and the first plane beam splitter 3 along the optical path to form a second light spot on the scale 9. The pattern of the light spot on the ruler can be photographed by the CCD camera 6 to determine the center point of the light spot. The center point of the first light spot can be set as M, and the center point of the second light spot can be set as N.

[0027] The front and back surfaces of the first plane beam splitter 3 and the second plane beam splitter 4 are both beam splitting surfaces. Therefore, in addition to the light beams forming the first light spot and the second light spot mentioned above, other transmitted or reflected light beams will be generated. These light beams have no effect on the alignment measurement accuracy of the system and are therefore not considered.

[0028] The system also includes a control unit, which is connected to the CCD camera 6 and the turntable 10, and includes an image processing module, an inclination angle calculation module and a turntable rotation angle control module. The image processing module is used to receive the light spot image information captured by the CCD camera 6 and determine the coordinates of the center position of the light spot, with the position of the center point of the light spot on the ruler as the horizontal coordinate of the light spot, and the distance H between the ruler and the central axis of the laser emission end face of the laser as the vertical coordinate of the light spot. The inclination angle calculation module is used to calculate the inclination angle of the first plane beam splitter 3, and the turntable rotation angle control module is used to calculate the angle that the turntable 10 needs to rotate and control the rotation of the turntable 10.

[0029] The working principle of the spatial position alignment system is as follows Figure 2 As shown in the figure, a coordinate system is established with the center point of the laser emitting end face as the coordinate origin o, the central axis of the laser 1 emitting end face as the X-axis, and the direction perpendicular to the central axis as the Y-axis. Figure 2 In the figure, the straight line AB represents the first plane beam splitter 3, the straight line CD represents the second plane beam splitter 4 or the plane reflector 5, the straight line EF represents the scale 9, the angle between the straight line AB and the X-axis is a, and the distance between the intersection of the straight line AB and the X-axis and the origin o is R, then the straight line equation of the straight line AB is:

[0030] Formula ①

[0031] The distance between the straight line CD and the straight line AB in the X-axis direction is L. Assuming that the angle between the reflected line UV formed by the light incident along the X-axis and reflected by the straight line CD is β, the straight line equation of the reflected line UV is:

[0032] Formula ②

[0033] Assume that the intersection point of the reflection line UV and the straight line AB is V. The coordinates of the intersection point V can be calculated from equations ① and ② as follows: , the distance between the straight line EF and the X-axis is known to be H, the light beam forms a reflection line on the first plane beam splitter 3 as a straight line VP, and the straight line VP intersects the straight line EF at point P. If the coordinates of point P are (X, H), the slope of the straight line VP can be calculated. Formula ③

[0034] according to Figure 2 By deducing the angle relationship, we know that the angle between the straight line VP and the X-axis is 2a-β, so the slope of the straight line VP is also:

[0035] Formula ④

[0036] By arranging and deriving equations ③ and ④, we can know that:

[0037] Formula ⑤

[0038] As in formula ⑤, the straight line CD represents the second plane beam splitter 4. Assume that the coordinates of the center point M of the first light spot formed on the ruler by the light beam reflected by the second plane beam splitter and the first plane beam splitter are (Xc, H). Since the second plane beam splitter 4 is set perpendicular to the horizontal plane, β is 0. Substituting β=0 into formula ⑤ can deduce:

[0039] Formula ⑥

[0040] In the above formula, the values ​​of R and H are known, so the actual tilt angle a of the first plane beam splitter 3 can be calculated by only collecting the image of the first light spot through the CCD camera and determining the value of the horizontal coordinate Xc of the center point M of the first light spot.

[0041] As in formula ⑤, the straight line CD represents the plane reflector 5, and the distance between the plane reflector 5 and the first plane beam splitter in the horizontal direction is L1. Assume that the coordinates of the center point N of the second light spot formed on the ruler by the light beam reflected by the plane reflector 5 and the first plane beam splitter are (Xd, H), and the deflection angle between the reflected line UV and the X-axis is β1. Substituting the above parameters into formula ⑤, we can get:

[0042] Formula 7

[0043] In the above formula, the values ​​of L1, H, and R are known, and the value of a can be calculated by formula ⑥. In this way, it is only necessary to collect the image of the second light spot through the CCD camera and determine the value of the horizontal coordinate Xd of the center point N of the second light spot to calculate the value of the angle β1. If the value of β1 is 0, it is determined that the radar to be tested and the laser end face are in an aligned state. If the value of β1 is not 0, the control unit can be used to control the turntable to rotate in the direction opposite to the deflection of the reflected line UV. , so that the radar to be tested is aligned with the laser end face.

[0044] During the setting process of the system, the second plane beam splitter 4 is set perpendicular to the horizontal plane, which is easy to set and not prone to angle deviation. Therefore, the second plane beam splitter 4 can be used as a calibration mirror to calculate the actual tilt angle of the first plane beam splitter 3, so that the error caused by mechanical installation and mirror processing can be eliminated, and the alignment accuracy of the system can be effectively improved. In addition, the second plane beam splitter used as a calibration mirror in the system is located in the same optical path system as the first plane beam splitter, which can also effectively eliminate the deviation originally caused by the optical path system.

[0045] like Figure 1As shown, as a specific embodiment of the present invention, the system also includes a stand 7, which is horizontally arranged and can be used as a horizontal reference for the entire system. The laser 1, the radar 2 to be tested, the first plane spectroscope 3, and the second plane spectroscope 4 are all arranged on the stand 7, the radar 2 to be tested is connected to the stand 7 through a support frame 11, the first plane spectroscope 3 is connected to the stand 7 through a support frame 13, and the second plane spectroscope 4 is connected to the stand 7 through a support frame 12. A shell 8 is also arranged on the stand 7, and the shell 8 is also arranged on the stand. The laser 1, the first plane spectroscope 3, the second plane spectroscope 4, the CCD camera 6, and the scale 9 are all located in the shell, and the CCD camera 6 is arranged on the top of the shell 8. The laser 1 is arranged on the side wall of the shell 8, and the side wall of the shell 8 is arranged vertically to the stand 7. This structure is adopted to facilitate the installation and positioning of the entire system.

[0046] The present invention also discloses a method for using the spatial position alignment system, which comprises the following steps:

[0047] Step 1: The laser emits a horizontal laser beam through the laser, and the laser beam is transmitted through the first plane beam splitter 3, reflected by the second plane beam splitter 4, and reflected by the first plane beam splitter 3 along the optical path to form a first light spot on the ruler 9; at the same time, the laser beam is transmitted through the first plane beam splitter 3, transmitted by the second plane beam splitter 4, reflected by the plane reflector 5, transmitted by the second plane beam splitter 4, and reflected by the first plane beam splitter 3 along the optical path to form a second light spot on the ruler 9 (such as Figure 1 In order to distinguish the first light spot from the second light spot, the first light spot and the second light spot can be set to different brightnesses, and the two light spots can be set to different brightnesses by setting the transmittance and reflectivity of the splitting surfaces of the first plane beam splitter 3 and the second plane beam splitter 4. As another embodiment, the positions of the two light spots can also be determined by shielding the plane reflector 5.

[0048] Step 2: Use a CCD camera to capture the first and second light spot images, and perform image processing on the light spot images to determine the center position of the light spot. Determining the center position of the light spot based on the light spot image is a known technology, so it will not be described in detail here. After determining the center position of the light spot, the horizontal coordinate of the light spot can be determined according to the scale scale, and the vertical coordinate of the light spot is the distance H between the scale and the laser emission end face. In this way, the coordinates of the center point M of the first light spot can be determined as (Xc, H), and the coordinates of the center point N of the second light spot can be determined as (Xd, H);

[0049] Step 3: Calculate the actual inclination angle α between the first plane beam splitter and the horizontal plane according to the coordinate value of the center point M of the first light spot and the distance R between the first plane beam splitter and the central axis of the laser emission end face. Through the above principle analysis, it can be known that the calculation formula of the inclination angle α between the first plane beam splitter and the horizontal plane is: .

[0050] Step 4: Calculate the value of the deflection angle β1 of the reflected line of the plane reflector according to the calculated value of the inclination angle α, the distance L1 between the plane reflector and the first plane beam splitter along the central axis of the laser emission end face, and the coordinate value of the center point N of the second light spot. The calculation formula is: .

[0051] Step 5: Control the turntable to rotate in the opposite direction of the deflection direction of the plane reflector , complete the alignment of the plane reflector and the laser on the radar, that is, the alignment of the transmitting group and the target group of the radar test system.

[0052] The high-precision spatial position alignment system is equipped with two plane beam splitters. The CCD camera collects the light spot reflected by the plane beam splitter on the scale and determines the coordinates of the center point of the light spot. The actual tilt angle of the first plane beam splitter and the offset angle of the end face of the radar to be tested are calculated by the plane mirror reflection principle, and then the turntable is controlled to rotate to achieve precise alignment between the radar to be tested and the laser. The alignment system does not need to strictly limit the tilt angle of the first plane beam splitter, but calculates and determines the tilt angle of the first plane beam splitter through the collected light spot coordinates. This can effectively reduce the installation difficulty of each component in the system, eliminate the angle deviation of the plane beam splitter caused by mechanical installation or mirror processing, and effectively improve the alignment accuracy of the alignment system. The system can also achieve small-angle precise offset of the radar by controlling the rotation angle of the turntable, and can achieve small-angle testing of the radar.

[0053] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the scope of the present invention.

Claims

1. A spatial position alignment test system for radar testing, characterized in that: It includes: A laser, wherein the laser is used to emit a laser beam in a horizontal direction; The radar to be tested is arranged on a turntable, the turntable can drive the radar to be tested to rotate, a plane reflector is fixedly installed on the end surface of the radar to be tested, and the plane reflector is opposite to the laser; A first plane beam splitter, wherein the first plane beam splitter is arranged between the laser and the radar to be measured, the first plane beam splitter is arranged to be inclined with respect to a horizontal plane, and both the front and back surfaces of the first plane beam splitter are beam splitting surfaces; A second plane beam splitter, wherein the second plane beam splitter is arranged between the first plane beam splitter and the radar to be measured, the second plane beam splitter is arranged perpendicular to the horizontal plane, and both the front and back surfaces of the second plane beam splitter are beam splitting surfaces; A ruler, the ruler is located on one side of the first plane beam splitter, the ruler is a semi-transparent ruler with scales, and the ruler is arranged parallel to the central axis of the emission end face of the laser; A CCD camera, the CCD camera is arranged on one side of the ruler, and the CCD camera is used to capture a light spot image on the ruler; A control unit, the control unit is connected to the CCD camera and the turntable, the control unit includes an image processing module, an inclination angle calculation module and a turntable rotation angle control module, the image processing module is used to determine the coordinates of the center position of the light spot according to the light spot image collected by the CCD camera; the inclination angle calculation module is used to calculate the inclination angle of the first plane beam splitter, and the turntable rotation angle control module is used to calculate the angle that the turntable needs to rotate and control the rotation of the turntable.

2. The spatial position alignment test system for radar testing according to claim 1, characterized in that: The tilt angle calculation module calculates the tilt angle of the first plane beam splitter using the following formula: , where α is the inclination angle of the first plane beam splitter, R is the distance between the first plane beam splitter and the central axis of the laser along the laser emission end face, H is the ordinate of the center point M of the first light spot formed on the ruler by the laser beam reflected by the second plane beam splitter and the first plane beam splitter, and Xc is the abscissa of the center point M of the first light spot.

3. The spatial position alignment test system for radar testing according to claim 2, characterized in that: The turntable rotation angle control module calculates the angle that the turntable needs to rotate using the following formula: , where α is the inclination angle of the first plane beam splitter, R is the distance between the first plane beam splitter and the laser along the central axis of the laser emission end face, L1 is the distance between the first plane beam splitter and the plane reflector along the central axis of the laser emission end face, H is the ordinate of the center point N of the second light spot formed on the ruler by the laser beam reflected by the plane reflector and the first plane beam splitter, Xd is the abscissa of the center point N of the second light spot, and β1 is twice the rotation angle of the turntable.

4. The spatial position alignment test system for radar testing according to claim 1, characterized in that: It also includes a stand, which is horizontally arranged, and the laser, the radar to be tested, the first plane spectroscope, and the second plane spectroscope are all arranged on the stand.

5. The spatial position alignment test system for radar testing according to claim 4, characterized in that: It also includes a shell, in which the laser, the first plane beam splitter, the second plane beam splitter, the CCD camera, and the ruler are all located. The CCD camera is arranged on the top of the shell, and the laser is arranged on the side wall of the shell, and the side wall of the shell is arranged perpendicular to the stand.

6. A method for using the spatial position alignment test system for radar testing according to claim 1, characterized in that It includes the following steps: Step 1: A laser emits a horizontal laser beam, and the laser beam is transmitted through the first plane beam splitter, reflected through the second plane beam splitter, and reflected through the first plane beam splitter in sequence along the optical path to form a first light spot on the ruler; the laser beam is transmitted through the first plane beam splitter, transmitted through the second plane beam splitter, reflected through the plane reflector, transmitted through the second plane beam splitter, and reflected through the first plane beam splitter in sequence along the optical path to form a second light spot on the ruler; Step 2: Use a CCD camera to capture the first light spot and the second light spot images, and perform image processing on the light spot images to determine that the coordinates of the center point M of the first light spot are (Xc, H), and the coordinates of the center point N of the second light spot are (Xd, H); Step 3: Calculate the actual inclination angle α between the first plane beam splitter and the horizontal plane according to the coordinate value of the center point M of the first light spot and the distance R between the first plane beam splitter and the central axis of the laser emission end face of the laser; Step 4: Calculate the value of the deflection angle β1 of the reflected line of the plane reflector according to the calculated value of the inclination angle α, the distance L1 between the plane reflector and the first plane beam splitter along the central axis of the laser emission end face, and the coordinate value of the center point N of the second light spot; Step 5: Control the turntable to rotate in the opposite direction of the deflection direction of the plane reflector , complete the alignment of the plane reflector and the laser on the radar to be tested.

7. The method for using the spatial position alignment test system for radar testing according to claim 6, characterized in that: The first light spot and the second light spot have different brightness.

8. The method for using the spatial position alignment test system for radar testing according to claim 6, characterized in that: The calculation formula for the inclination angle α between the first plane beam splitter and the horizontal plane in step 3 is: , where α is the inclination angle of the first plane beam splitter, R is the distance between the first plane beam splitter and the central axis of the laser along the laser emission end face, H is the ordinate of the center point M of the first light spot, and Xc is the abscissa of the center point M of the first light spot.

9. The method for using the spatial position alignment test system for radar testing according to claim 8, characterized in that: The calculation formula for the deflection angle β1 of the reflected light from the plane reflector in step 4 is: , where α is the inclination angle of the first plane beam splitter, L1 is the distance between the first plane beam splitter and the plane reflector along the central axis of the laser emitting end face, R is the distance between the first plane beam splitter and the laser along the central axis of the laser emitting end face, H is the ordinate of the center point N of the second light spot, and Xd is the abscissa of the center point N of the second light spot.

Images