Ground space pointing accuracy test method for large defocus two-dimensional tracking detection system

Abstract

The application discloses a ground space pointing precision testing method for a large-defocus two-dimensional tracking and detecting system, and solves the technical problem that the existing space pointing precision testing method for a two-dimensional tracking and detecting system is not applicable to the space pointing precision testing of a large-defocus two-dimensional tracking and detecting system, and comprises the following steps: adjusting the azimuth angle and the elevation angle of the large-defocus two-dimensional tracking and detecting system to be 0 degrees, aiming at the large-defocus two-dimensional tracking and detecting system by using a first autocollimation theodolite, adjusting the position of a second autocollimation theodolite, aiming at the large-defocus two-dimensional tracking and detecting system, then mutually aiming at each other by the first autocollimation theodolite and the second autocollimation theodolite, and finally calculating the space pointing azimuth error and the elevation error of the large-defocus two-dimensional tracking and detecting system according to the measured azimuth angle and the elevation angle.

Description

Technical Field

[0001] This invention relates to a method for testing the pointing accuracy of a two-dimensional tracking and detection system on the ground, specifically a method for testing the pointing accuracy of a two-dimensional tracking and detection system with a large defocus amount on the ground. Background Technology

[0002] Spaceborne or airborne two-dimensional tracking and detection systems are widely used in the aerospace field for target detection, tracking, and measurement. Their spatial pointing accuracy directly determines the core performance of detection / tracking. Failure to accurately determine the target's orientation can lead to target loss, ranging and angular measurement deviations, and consequently affect the accuracy of the entire subsequent tracking and detection process.

[0003] Current common methods for testing the spatial pointing accuracy of two-dimensional tracking and detection systems require the use of multiple collimators to simulate different spatial angles, and these angles are then calibrated. The two-dimensional tracking and detection system is then placed on a stable foundation, and the pointing of the two-dimensional tracking mechanism within the system is controlled so that the target emitted from each collimator is at the center of the system's field of view. The azimuth and elevation angles of the corresponding photoelectric turntable are recorded. Using the position of one of the collimators pointing downwards as a reference, the angles between the pointing positions of the other collimators and the reference position are calculated and compared with the previously calibrated spatial angles to evaluate the spatial pointing accuracy of the two-dimensional tracking and detection system. This method is suitable for testing the spatial pointing accuracy of two-dimensional tracking and detection systems without defocusing under normal pressure. The focal plane of the collimator only needs to be placed at a position corresponding to the infinity beam; there are no requirements regarding the relative placement of the two-dimensional tracking and detection system and the collimators.

[0004] With the development of optical imaging technology, in pursuit of better image quality, two-dimensional tracking and detection systems generally employ reflective optical systems. If a wider field of view and good image quality are required, a multi-element transmissive optical system is necessary. Due to the large number of lenses, the refractive index differs significantly between atmospheric pressure and vacuum or low pressure environments. Therefore, during ground-based assembly and adjustment of the two-dimensional tracking and detection system, the image plane defocus must be pre-set, resulting in a large defocus amount. If existing spatial pointing accuracy testing methods for two-dimensional tracking and detection systems are used, and a collimator is used to simulate spatial angles, the following problems arise when testing the spatial pointing accuracy of a two-dimensional tracking and detection system with a large defocus amount:

[0005] 1) When a target at infinity enters a two-dimensional tracking and detection system with a large defocus, the star image is greatly diffused and the energy is dispersed, which is not conducive to the extraction of the centroid.

[0006] 2) When the incident angle of the collimator is different, or when the aperture position of the collimator output beam covering the large defocus amount two-dimensional tracking and detection system is different, the shape of the diffuse star points will change, affecting the centroid extraction and introducing a systematic error in spatial pointing accuracy.

[0007] Due to the aforementioned issues during testing, the spatial pointing accuracy test method for a two-dimensional tracking and detection system using multiple collimators to simulate different spatial angles under normal pressure affects the accuracy of the spatial pointing accuracy test for a two-dimensional tracking and detection system with a large defocus amount. Summary of the Invention

[0008] The purpose of this invention is to solve the technical problem that existing spatial pointing accuracy testing methods for two-dimensional tracking and detection systems, when used for spatial pointing accuracy testing of two-dimensional tracking and detection systems with large defocus amounts, will result in large pointing accuracy errors. Therefore, this invention provides a ground-based spatial pointing accuracy testing method for two-dimensional tracking and detection systems with large defocus amounts.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A ground-based spatial pointing accuracy testing method for a two-dimensional tracking and detection system with large defocusing amount, characterized by comprising the following steps:

[0011] Step 1: Obtain the large defocus amount two-dimensional tracking detection system to be tested, place it on a flat ground and level it, adjust its azimuth and pitch angles to 0°, determine the height H between the pitch axis and the ground, and the spatial pointing range of the azimuth and pitch angles.

[0012] Step 2: Obtain the laser line projector and the first autocollimating theodolite. Adjust the placement of the first autocollimating theodolite using the laser line projector, setting the height of the test center of the first autocollimating theodolite above the ground to H. This ensures that the crosshair target emitted by the theodolite is imaged onto the detector of the large defocus two-dimensional tracking and detection system, forming a crosshair image. The intersection of the crosshair image coincides with the center of the detector. The azimuth angle of the first autocollimating theodolite is then obtained. The pitch angle is ;

[0013] Step 3: Based on the spatial pointing range of the azimuth and elevation angles of the large defocus two-dimensional tracking detection system, select N test locations, among which... Define N test locations, each numbered k, k=1, 2, ..., N; then each test location corresponds to a set of azimuth angles of a large defocus two-dimensional tracking and detection system. and pitch angle And acquire the second autocollimating theodolite;

[0014] Step 4: Place the second autocollimating theodolite at one of the N test positions. After adjusting the azimuth and elevation angles of the large defocus two-dimensional tracking detection system to the corresponding angles at that position, adjust the position of the second autocollimating theodolite using a laser line projector. Also adjust the height h, azimuth, and elevation angles of the test center of the second autocollimating theodolite so that the emitted crosshair target is imaged onto the detector of the large defocus two-dimensional tracking detection system, forming a crosshair image. Record the azimuth angle of the second autocollimating theodolite at this first test position. and pitch angle ;

[0015] Step 5: Align the first autocollimating theodolite with the second autocollimating theodolite so that their outgoing beams are parallel and at least partially overlap. Record the azimuth angle of the first autocollimating theodolite at this point. The azimuth angle of the second autocollimating theodolite ;

[0016] Step 6: Adjust the placement of the second autocollimating theodolite, and using the methods in Steps 4 and 5, record the azimuth angles at the remaining N-1 test positions when the crosshair target emitted by the second autocollimating theodolite is imaged at the center of the detector. and pitch angle And the azimuth angle of the first autocollimating theodolite when the first autocollimating theodolite and the second autocollimating theodolite are aligned with each other. The azimuth angle of the second autocollimating theodolite ;

[0017] Step 7: Calculate the spatial pointing azimuth error of the large defocus two-dimensional tracking and detection system. and pitch error The ground-based spatial pointing accuracy test of the large defocus amount two-dimensional tracking and detection system was completed.

[0018] Furthermore, step 2 specifically involves:

[0019] Step 2.1: Obtain the laser projector, place it on the side of the light shield of the large defocus two-dimensional tracking and detection system, and adjust the attitude of the laser projector so that the vertical laser surface it projects passes through the vertical symmetrical center line of the light shield.

[0020] Step 2.2: Obtain the first autocollimating theodolite, turn on its ground-aligning laser to form a laser spot on the ground, and move the first autocollimating theodolite so that its laser spot is on the intersection line of the vertical laser surface projected by the laser projector and the ground.

[0021] Step 2.3: Adjust the height of the test center of the first autocollimating theodolite above the ground to H, and adjust its azimuth and elevation angles so that the crosshair target emitted by it is imaged on the detector of the large defocus two-dimensional tracking detection system, forming a crosshair image, and the intersection point of the crosshair image coincides with the center of the detector. The azimuth angle of the first autocollimating theodolite is then obtained. The pitch angle is .

[0022] Furthermore, in step 4, the same method as in steps 2.1 and 2.2 is used to adjust the position of the second autocollimating theodolite using a laser line projector.

[0023] Furthermore, in step 4, the formula for calculating the height h is as follows:

[0024] ;

[0025] Where D is the distance between the laser spot of the second autocollimating theodolite and the rotation center of the large defocus two-dimensional tracking and detection system at the ground projection point; Let be the pitch angle of the large defocus two-dimensional tracking and detection system at each of the N test locations.

[0026] Furthermore, in step 3, the selection process for the N test locations is as follows:

[0027] The azimuth spatial pointing range of the large defocus two-dimensional tracking and detection system is divided into L equal parts, yielding L+1 azimuth angle values ​​corresponding to interval nodes. The pitch spatial pointing range is divided into M equal parts, yielding M+1 pitch angle values ​​corresponding to interval nodes. Each azimuth angle value from the L+1 interval nodes is iteratively combined with the M+1 pitch angle values. Test positions where both azimuth and pitch angles are 0° are removed, ultimately yielding... There are 10 test locations, among which... .

[0028] Furthermore, in step 4, the azimuth angle of the second autocollimating theodolite at the test location is recorded. and pitch angle The specific process is as follows:

[0029] If the intersection of the crosshairs precisely coincides with the center of the detector, then record the azimuth angle of the second autocollimating theodolite at that location. and pitch angle ;

[0030] If the intersection of the crosshairs deviates from the center of the detector, the azimuth angle of the second autocollimating theodolite at that location is recorded. and pitch angle And azimuth miss distance Angle projected onto the horizontal plane ;in, The calculation process is as follows:

[0031] Reading the crosshair image and the azimuth miss distance of a two-dimensional tracking and detection system with large defocus. Pitch miss distance Then, the azimuth miss angle of the second autocollimating theodolite in the large defocus two-dimensional tracking and detection system was calculated. and pitch angle ,as well as The calculation formula is:

[0032] ;

[0033] ;

[0034] ;

[0035] Where d is the detector pixel size; The focal length is the focal length of a two-dimensional tracking and detection system with a large defocus amount.

[0036] Furthermore, step 7 specifically includes:

[0037] Step 7.1: Calculate the relative true values ​​of the azimuth angles at each of the N test positions of the large defocus two-dimensional tracking and detection system. The relative true value of the pitch angle The calculation formula is as follows:

[0038] ;

[0039] ;

[0040] Step 7.2: Calculate the composite azimuth angle of each of the N test positions of the large defocus two-dimensional tracking and detection system. Combined angle of pitch ;

[0041] If the intersection of the crosshairs formed by the second autocollimating theodolite and the center of the detector in the large defocus two-dimensional tracking detection system precisely coincides, then the calculation formula is as follows:

[0042] ;

[0043] ;

[0044] If the intersection of the crosshairs formed by the second autocollimating theodolite and the center of the detector in the large defocus two-dimensional tracking detection system deviates, the calculation formula is as follows:

[0045] ;

[0046] ;

[0047] Step 7.3: Calculate the spatial pointing azimuth error of the large defocus two-dimensional tracking detection system. and pitch error The ground-based spatial pointing accuracy test of the large defocus two-dimensional tracking and detection system was completed. The calculation formula is as follows:

[0048] ;

[0049] .

[0050] The beneficial effects of this invention are:

[0051] 1. The present invention provides a ground-based spatial pointing accuracy testing method for a large defocus amount two-dimensional tracking and detection system. By employing a first autocollimating theodolite and a second autocollimating theodolite in combination, the ground-based spatial pointing accuracy of the large defocus amount two-dimensional tracking and detection system can be tested. By adjusting the focusing handwheels of the first and second autocollimating theodolites, the defocus amount of the large defocus amount two-dimensional tracking and detection system can be compensated as needed. This method can flexibly simulate spatial pointing accuracy at any position, avoiding the centroid position error and spatial pointing accuracy system error introduced by different incident angles of the collimator and different aperture positions of the collimator's output beam covering the detection system. This solves the problem of ground-based spatial pointing accuracy testing for large defocus amount two-dimensional tracking and detection systems used in aviation and aerospace, and ensures the consistency of pointing accuracy between the ground and space.

[0052] 2. The ground spatial pointing accuracy test method of the large defocus amount two-dimensional tracking detection system of the present invention improves the alignment accuracy of the optical axis by positioning the first autocollimating theodolite and the second autocollimating theodolite using a laser line projector, thereby improving the ground testing accuracy of the spatial pointing accuracy of the large defocus amount detection system.

[0053] 3. The ground spatial pointing accuracy testing method of the large defocus amount two-dimensional tracking detection system of the present invention addresses the issue that, in existing technologies, once the spatial angle of the collimator is calibrated, its position cannot be adjusted again. When adjusting the optical axis of the two-dimensional tracking detection system to be collinear with the optical axis of the collimator, it is necessary to frequently adjust the placement and spatial pointing of the two-dimensional tracking detection system. Furthermore, due to the large size of the two-dimensional tracking detection system, the relocation process is time-consuming and laborious. The present invention, by locating the position of the first autocollimating theodolite and adjusting the placement of the second autocollimating theodolite as needed, enables the first and second autocollimating theodolites to align with each other, thereby simulating the spatial angle. This eliminates the need for frequent adjustments to the placement of the two-dimensional tracking detection system, making the adjustment method convenient and quick. Attached Figure Description

[0054] Figure 1This is a schematic diagram of the placement of the first autocollimating theodolite in step 2 of the embodiment of the ground space pointing accuracy test method of the large defocus amount two-dimensional tracking detection system of the present invention (where the red part is only a schematic diagram of the laser beam transmitted by the laser line projector, and its actual emission angle is greater than 180°).

[0055] Figure 2 yes Figure 1 Top view (rotated 90° counterclockwise);

[0056] Figure 3 This is a schematic diagram of the placement position of one of the N positions of the second autocollimating theodolite in step 4 of the embodiment of the ground space pointing accuracy test method of the large defocus amount two-dimensional tracking detection system of the present invention;

[0057] Figure 4 This is a schematic diagram of the mutual aiming principle of the first autocollimating theodolite and the second autocollimating theodolite in step 5 of the embodiment of the ground space pointing accuracy test method of the large defocus amount two-dimensional tracking detection system of the present invention.

[0058] The attached figures are labeled as follows:

[0059] 1. First autocollimating theodolite; 2. Laser line projector; 3. Large defocus two-dimensional tracking detection system; 4. Second autocollimating theodolite. Detailed Implementation

[0060] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] This invention provides a ground-based spatial pointing accuracy testing method for a two-dimensional tracking and detection system with large defocusing amount, characterized by comprising the following steps:

[0062] Step 1: Obtain the large defocus amount two-dimensional tracking detection system 3 to be tested, place it on a flat ground and level it, adjust its azimuth and pitch angles to 0°, and determine the height H between the pitch axis and the ground.

[0063] Step 2: Obtain the laser line projector 2, place it on the side of the light shield of the large defocus two-dimensional tracking detection system 3, and adjust the posture of the laser line projector 2 so that the vertical laser surface it projects passes through the vertical symmetrical center line of the light shield.

[0064] Step 3: Obtain the first autocollimating theodolite 1, turn on its ground-aligning laser to form a laser spot on the ground, and move the first autocollimating theodolite 1 so that its laser spot is on the intersection line of the vertical laser surface projected by the laser projector and the ground.

[0065] Step 4: Adjust the height of the test center of the first autocollimating theodolite 1 above the ground to H, adjust its azimuth and elevation angles, and adjust the focusing handwheel of the first autocollimating theodolite 1 so that the emitted crosshair target is imaged on the detector of the large defocus amount two-dimensional tracking detection system 3, forming a crosshair image, and the intersection point of the crosshair image coincides with the center of the detector, thus obtaining the azimuth angle of the first autocollimating theodolite 1 as follows: The pitch angle is ;

[0066] Step 5: Based on the spatial pointing range of the azimuth and elevation angles of the large defocus two-dimensional tracking detection system 3, select N test locations, among which... Define N test positions, each numbered k, k=1, 2, ..., N; then each test position corresponds to a set of azimuth angles of the large defocus two-dimensional tracking and detection system 3. and pitch angle And obtain the second autocollimating theodolite 4; the selection process of N test positions is as follows:

[0067] The azimuth spatial pointing range of the large defocus two-dimensional tracking and detection system 3 is divided into L equal parts, yielding L+1 azimuth angle values ​​corresponding to interval nodes. The pitch spatial pointing range is divided into M equal parts, yielding M+1 pitch angle values ​​corresponding to interval nodes. After iterating and combining each azimuth angle value from the L+1 azimuth angle values ​​with the M+1 pitch angle values, test positions where both azimuth and pitch angles are 0° are removed, finally obtaining... There are 10 test locations, among which... .

[0068] Step 6: Place the second autocollimating theodolite 4 at one of the N test positions. Adjust the azimuth and pitch angles of the large defocus amount two-dimensional tracking detection system 3 to the corresponding angles at that position. Then, place the laser line projector 2 between the second autocollimating theodolite 4 and the large defocus amount two-dimensional tracking detection system 3, with the vertical laser surface it projects passing through the vertical symmetrical centerline of the light shield. Turn on the ground-level laser centering function of the second autocollimating theodolite 4 to form a laser spot on the ground. By moving the position of the second autocollimating theodolite 4, its laser spot is positioned on the intersection line of the vertical laser surface projected by the laser line projector 2 and the ground.

[0069] Step 7: Adjust the test center height of the second autocollimating theodolite 4 to h, and Then, the azimuth and elevation angles of the second autocollimating theodolite 4 are adjusted so that the cross-shaped target emitted by the second autocollimating theodolite 4 is imaged on the detector of the large defocus amount two-dimensional tracking and detection system 3, forming a cross image; where D is the distance between the laser spot of the second autocollimating theodolite 4 and the rotation center of the large defocus amount two-dimensional tracking and detection system 3 at the ground projection point.

[0070] If the intersection of the crosshairs precisely coincides with the center of the detector, then record the azimuth angle of the second autocollimating theodolite 4 at that test location. and pitch angle ;

[0071] If the intersection of the crosshairs deviates from the center of the detector, the azimuth angle of the second autocollimating theodolite 4 at that test location is recorded. and pitch angle And azimuth miss distance Angle projected onto the horizontal plane ;in, The calculation process is as follows:

[0072] Reading the crosshair image and the azimuth miss distance of the large defocus two-dimensional tracking and detection system 3 Pitch miss distance Then, the azimuth miss angle of the second autocollimating theodolite 4 in the large defocus two-dimensional tracking detection system 3 is calculated. and pitch angle ,as well as The calculation formula is:

[0073] ;

[0074] ;

[0075] ;

[0076] Where d is the detector pixel size; The focal length of the large defocus two-dimensional tracking and detection system 3;

[0077] Step 8: Align the first autocollimating theodolite 1 with the second autocollimating theodolite 4 so that their outgoing beams are parallel and at least partially overlap. Record the azimuth angle of the first autocollimating theodolite 1 at this point. The azimuth angle of the second autocollimating theodolite 4 ;

[0078] Step 9: Adjust the placement of the second autocollimating theodolite 4, and using the methods in steps 6-8, record the azimuth angles at the remaining N-1 test positions when the crosshair target emitted from the second autocollimating theodolite 4 is imaged at the center of the detector. and pitch angle And when the first autocollimating theodolite 1 and the second autocollimating theodolite 4 are aligned with each other, the azimuth angle of the first autocollimating theodolite 1 is... The azimuth angle of the second autocollimating theodolite 4 ;

[0079] Step 10: Calculate the relative true values ​​of the azimuth angles of the N test positions of the large defocus amount two-dimensional tracking and detection system 3. The relative true value of the pitch angle The calculation formula is as follows:

[0080] ;

[0081] ;

[0082] Step 11: Calculate the composite azimuth angle of each of the N test positions of the large defocus amount two-dimensional tracking and detection system 3. Combined angle of pitch ;

[0083] If the intersection of the crosshairs formed by the second autocollimating theodolite 4 and the center of the detector in the large defocus two-dimensional tracking detection system 3 precisely coincides, then the calculation formula is as follows:

[0084] ;

[0085] ;

[0086] If the intersection of the crosshairs formed by the second autocollimating theodolite 4 and the center of the detector in the large defocus two-dimensional tracking detection system 3 deviates, the calculation formula is as follows:

[0087] ;

[0088] ;

[0089] Step 12: Calculate the spatial pointing azimuth error of the large defocus two-dimensional tracking detection system 3. and pitch error The ground-based spatial pointing accuracy test of the large defocus two-dimensional tracking and detection system was completed. The calculation formula is as follows:

[0090] ;

[0091] .

[0092] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A ground-based spatial pointing accuracy testing method for a two-dimensional tracking and detection system with large defocusing amount, characterized in that, Includes the following steps: Step 1: Obtain the large defocus amount two-dimensional tracking detection system to be tested (3), place it on a flat ground and level it, adjust its azimuth and pitch angles to 0°, determine the height between the pitch axis and the ground as H, and the spatial pointing range of the azimuth and pitch angles; Step 2: Obtain the laser line projector (2) and the first autocollimating theodolite (1). Adjust the placement of the first autocollimating theodolite (1) using the laser line projector (2), and adjust the height of the test center of the first autocollimating theodolite (1) above the ground to H, so that the cross-shaped target emitted by it is imaged on the detector of the large defocus two-dimensional tracking detection system (3), forming a cross image, and the intersection of the cross image coincides with the center of the detector, thus obtaining the azimuth angle of the first autocollimating theodolite (1). The pitch angle is ; Step 3: Based on the spatial pointing range of the azimuth and elevation angles of the large defocus two-dimensional tracking detection system (3), select N test locations, among which, ; Define N test positions, each test position is numbered k, k=1, 2, ..., N; then each test position corresponds to a set of azimuth angles of the large defocus amount two-dimensional tracking detection system (3). and pitch angle And obtain the second autocollimating theodolite (4); Step 4: Place the second autocollimating theodolite (4) at one of the N test positions. Adjust the azimuth and elevation angles of the large defocus two-dimensional tracking detection system (3) to the corresponding angles at that position. Then, adjust the position of the second autocollimating theodolite (4) using the laser line projector (2), and adjust the height h, azimuth, and elevation angles of the test center of the second autocollimating theodolite (4) so ​​that the emitted crosshair target is imaged on the detector of the large defocus two-dimensional tracking detection system (3) to form a crosshair image. Record the azimuth angle of the second autocollimating theodolite (4) at that test position. and pitch angle ; Step 5: Align the first autocollimating theodolite (1) with the second autocollimating theodolite (4) so ​​that their outgoing beams are parallel and at least partially overlap. Record the azimuth angle of the first autocollimating theodolite (1) at this time. The azimuth angle of the second autocollimating theodolite (4) ; Step 6: Adjust the placement of the second autocollimating theodolite (4), and using the methods in steps 4 and 5, record the azimuth angles at the remaining N-1 test positions when the crosshair target emitted by the second autocollimating theodolite (4) is imaged at the center of the detector. and pitch angle And the azimuth angle of the first autocollimating theodolite (1) when the first autocollimating theodolite (1) and the second autocollimating theodolite (4) are aligned with each other. The azimuth angle of the second autocollimating theodolite (4) ; Step 7: Calculate the spatial pointing azimuth error of the large defocus two-dimensional tracking detection system (3). and pitch error The ground-based spatial pointing accuracy test of the large defocus amount two-dimensional tracking and detection system was completed.

2. The ground-based spatial pointing accuracy testing method for a large defocus two-dimensional tracking and detection system according to claim 1, characterized in that, Step 2 is as follows: Step 2.1: Obtain the laser projector (2), place it on the side of the light shield of the large defocus two-dimensional tracking detection system (3), and adjust the posture of the laser projector (2) so that the vertical laser surface it projects passes through the vertical symmetrical center line of the light shield. Step 2.2: Obtain the first autocollimating theodolite (1), turn on its ground-level centering laser, and form a laser spot on the ground. Move the first autocollimating theodolite (1) so that its laser spot is on the intersection line between the vertical laser surface projected by the laser projector (2) and the ground. Step 2.3: Adjust the height of the test center of the first autocollimating theodolite (1) above the ground to H, and adjust its azimuth and elevation angles so that the crosshair target emitted by it is imaged on the detector of the large defocus two-dimensional tracking detection system (3), forming a crosshair image, and the intersection of the crosshair image coincides with the center of the detector, thus obtaining the azimuth angle of the first autocollimating theodolite (1) as follows: The pitch angle is .

3. The ground-based spatial pointing accuracy testing method for a large defocus two-dimensional tracking and detection system according to claim 2, characterized in that: In step 4, the same method as in steps 2.1 and 2.2 is used to adjust the position of the second autocollimating theodolite (4) using the laser line projector (2).

4. The ground-based spatial pointing accuracy testing method for a large defocus two-dimensional tracking and detection system according to claim 3, characterized in that, In step 4, the formula for calculating height h is as follows: ； Where D is the distance between the laser spot of the second autocollimating theodolite (4) and the rotation center of the large defocus two-dimensional tracking detection system (3) at the ground projection point; The pitch angles of the large defocus two-dimensional tracking detection system (3) at N test positions.

5. The ground-based spatial pointing accuracy testing method for a large defocus two-dimensional tracking and detection system according to claim 1, characterized in that, In step 3, the selection process for the N test locations is as follows: The azimuth spatial pointing range of the large defocus two-dimensional tracking and detection system (3) is divided into L equal parts to obtain the azimuth angle values ​​corresponding to L+1 interval nodes. The pitch spatial pointing range is divided into M equal parts to obtain the pitch angle values ​​corresponding to M+1 interval nodes. After combining each azimuth angle value in the L+1 azimuth angle values ​​with the M+1 pitch angle values, the test positions where both the azimuth and pitch angles are 0° are removed, and finally the following is obtained: There are 10 test locations, among which... .

6. The ground-based spatial pointing accuracy testing method for a large defocus two-dimensional tracking and detection system according to claim 1, characterized in that, In step 4, record the azimuth angle of the second autocollimating theodolite (4) at the test location. and pitch angle The specific process is as follows: If the intersection of the crosshairs precisely coincides with the center of the detector, then record the azimuth angle of the second autocollimating theodolite (4) at that location. and pitch angle ; If the intersection of the crosshairs deviates from the center of the detector, the azimuth angle of the second autocollimating theodolite (4) at that location is recorded. and pitch angle And azimuth miss distance Angle projected onto the horizontal plane ;in, The calculation process is as follows: Read the azimuth miss distance of the crosshair image in the two-dimensional tracking and detection system (3) with large defocus. Pitch miss distance Then, the azimuth miss angle of the second autocollimating theodolite (4) in the large defocus two-dimensional tracking and detection system (3) is calculated. and pitch angle The calculation formula is: ； ； ； Where d is the detector pixel size; The focal length of the large defocus two-dimensional tracking detection system (3) is given.

7. The ground-based spatial pointing accuracy testing method for a large defocus two-dimensional tracking and detection system according to claim 6, characterized in that, Step 7 specifically includes: Step 7.1: Calculate the relative true values ​​of the azimuth angles of the N test positions of the large defocus two-dimensional tracking detection system (3). The relative true value of the pitch angle The calculation formula is as follows: ； ； Step 7.2: Calculate the composite azimuth angle of each of the N test positions of the large defocus two-dimensional tracking detection system (3). Combined angle of pitch ; If the intersection of the crosshairs formed by the second autocollimating theodolite (4) and the center of the detector in the large defocus two-dimensional tracking detection system (3) precisely coincides, then the calculation formula is as follows: ； ； If the intersection of the crosshairs formed by the second autocollimating theodolite (4) and the center of the detector in the large defocus two-dimensional tracking detection system (3) deviates, the calculation formula is as follows: ； ； Step 7.3: Calculate the spatial pointing azimuth error of the large defocus two-dimensional tracking detection system (3). and pitch error The ground-based spatial pointing accuracy test of the large defocus two-dimensional tracking and detection system was completed. The calculation formula is as follows: ； 。

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