A shafting matching calibration method for a mechanically scanning high-precision tracking radar

Abstract

The application provides a kind of machine phase sweep high-precision tracking radar shaft system matching calibration method, carries out machine phase sweep high-precision tracking radar antenna pedestal level adjustment;Carry out radar optical axis and mechanical shaft matching calibration, including beam angle shaft matching calibration and elevation angle shaft matching calibration, realize mechanical shaft and optical axis matching;Calculate the beam angle deviation and elevation angle deviation between electric axis and optical axis;With binding in radar servo software, correct the beam angle and elevation angle indication data of electric axis, realize electric axis and mechanical shaft matching;Carry out optical axis and electric axis matching calibration, including beam angle shaft matching calibration and elevation angle shaft matching calibration, realize optical axis and electric axis matching, finally realize electric axis, optical axis and mechanical shaft three-axis matching calibration.The method is simple and reliable, and can be widely used for machine phase sweep high-precision tracking radar shaft system matching calibration, improves machine phase sweep high-precision tracking radar production and debugging efficiency, and has good application prospect and comprehensive benefit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calibration of mechanically scanned high-precision tracking radar, and relates to a mechanically scanned high-precision tracking radar shaft system matching calibration method. BACKGROUND

[0002] A conventional tracking radar antenna pedestal mainly comprises a bearing and elevation fork, a high-frequency box and a reflector antenna. During processing, installation and array debugging of the radar, the electrical axis and the mechanical axis are mismatched due to some error factors, so shaft system matching calibration is needed before delivery to realize matching of the electrical axis, the optical axis and the mechanical axis. During shaft system calibration, an optical reference telescope installed on the antenna is used as a medium. The optical axis is matched with the mechanical axis by adjusting the optical reference telescope, the electrical axis is matched with the optical axis by adjusting the adjustable connecting structure between the reflector antenna and the high-frequency box, and finally the three axes are matched.

[0003] The mechanically scanned high-precision tracking radar antenna pedestal mainly comprises a bearing and elevation fork and a phased array. The antenna, the array and the fork are all fixed structure installations, unlike the adjustable connecting structure between the reflector antenna and the high-frequency box of the conventional tracking radar. Therefore, the mechanically scanned high-precision tracking radar cannot use the conventional tracking radar shaft system calibration method to adjust the electrical axis of the antenna through the adjustable structure to complete shaft system matching calibration.

[0004] The mechanically scanned high-precision tracking radar has high requirements for tracking accuracy. If the shaft system matching calibration is not in place, the tracking accuracy will be affected, and in severe cases, the target cannot be tracked. Therefore, to solve the problem of shaft system matching calibration of the mechanically scanned high-precision tracking radar and ensure mechanically scanned high-precision tracking, the present application provides a mechanically scanned high-precision tracking radar shaft system matching calibration method. SUMMARY

[0005] The present application aims to provide a mechanically scanned high-precision tracking radar shaft system matching calibration method to solve the problem of shaft system matching calibration of the mechanically scanned high-precision tracking radar and ensure mechanically scanned high-precision tracking.

[0006] The technical solution for achieving the present application is as follows: a mechanically scanned high-precision tracking radar shaft system matching calibration method, the basic implementation process of which is as follows:

[0007] Step 1: Adjust the level of the mechanically scanned high-precision tracking radar antenna pedestal.

[0008] Step 1-1: When adjusting the level of the antenna pedestal, first loosen the locking nut of the fixed base, so that the position of the lower inclined iron of the base can be changed to adjust the level of the antenna pedestal.

[0009] Step 1-2: Zero the antenna base azimuth angle and elevation angle, fix the electronic level on the top cover of the phased array surface, then in the range of 360° azimuth, every 45°, observe the value displayed on the electronic level, knock the inclined iron under the base to make the antenna base rise or fall to make the value displayed on the electronic level as close to 0 as possible, and record the value displayed on the electronic level in the direction, and then complete the adjustment in 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315° eight directions.

[0010] Step 1-3: Check the levelness of the antenna base, still fix the electronic level on the top cover of the phased array surface, measure the inclination in 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315° eight directions, find the maximum value and the minimum value in the eight direction measurement values, subtract and divide by 2, and the maximum non-parallelism of the antenna base is obtained. If it is greater than θ Th (θ Th According to the value of the radar levelness requirement, if θ Th = 1.5', then redo step 1-2; if it is less than θ Th , it is considered to meet the requirements, and after meeting the requirements, the locking nuts of the base are tightened again.

[0011] Second step: matching and calibration of the radar optical axis and the mechanical axis, including azimuth axis matching and calibration and elevation axis matching and calibration, to realize the matching of the mechanical axis and the optical axis.

[0012] (1) Azimuth axis matching and calibration:

[0013] Step 2-1: select a point-like calibration object at a distance of 1.5 km away from the antenna base;

[0014] Step 2-2: fix the theodolite base on the elevation axis bracket beside the phased array surface (at the reference telescope), so that the phased array surface is approximately horizontal, install the theodolite and aim at the calibration object, and adjust the theodolite to level according to the theodolite instruction book;

[0015] Step 2-3: align the center of the theodolite ocular "+" line with the calibration object, and lock the theodolite azimuth locking handle;

[0016] Step 2-4: manually adjust the phased array surface to tilt upward, and at the same time, manually adjust the theodolite ocular to tilt downward, until the boundary of the calibration object can still be seen from the theodolite ocular;

[0017] Step 2-5: check whether the center of the theodolite ocular "+" line is aligned with the calibration object, and manually adjust the antenna base azimuth to make the center of the theodolite ocular "+" line aligned with the calibration object;

[0018] Step 2-6: Lower the phased array to the initial position, and rotate the goniometer to make the center of the crosshair of the eyepiece again align with the calibration object.

[0019] Step 2-7: Repeat steps 2-4, 2-5 and 2-6. If the calibration object is always in the center of the crosshair when the phased array is tilted, it means that the optical axis of the theodolite is parallel to the mechanical axis in the direction of the bearing axis.

[0020] Step 2-8: Keep the positions of the antenna pedestal and the theodolite unchanged, loosen the bearing fixing nut of the reference telescope on the antenna pedestal, adjust the bearing fine screw to make the longitudinal axis of the crosshair of the reference telescope align with the calibration object. Thus, the optical axis of the radar is parallel to the mechanical axis in the direction of the bearing axis.

[0021] (2) Elevation axis matching calibration

[0022] Step 2-9: Set up a support beside the antenna pedestal, and fix the theodolite on the support to make the eyepiece of the theodolite at the same height as the reference telescope of the radar, and adjust the theodolite to be horizontal. Rotate the bearing axis and the elevation axis of the theodolite and aim at a point-like calibration object at a distance of 1.5 km or more, read and record the elevation data of the calibration object, loosen the elevation screw of the reference telescope, adjust the elevation axis of the telescope to make the center of the crosshair align with the calibration object, and then tighten the mounting screw of the reference telescope. Thus, the optical axis of the radar matches the mechanical axis.

[0023] Step 3: Measure and calculate the bearing deviation ΔA between the electrical axis and the optical axis e and the elevation deviation ΔE e .

[0024] Step 3-1: Set a microwave signal source horn 80 m away from the center of the phased array antenna, align the center of the horn with the antenna, link the horn with the signal source with a radio frequency cable, set a crosshair near the horn, and the relative position of the crosshair and the horn is consistent with the relative position of the reference telescope and the center of the antenna. Rotate the bearing and elevation of the antenna pedestal to make the crosshair of the reference telescope align with the crosshair near the horn, and record the bearing value θ A and the elevation value

[0025] Step 3-2: First, adjust the signal source and the radar to the center frequency of the radar, and the radar array beam is set to the normal beam. Start receiving the signal emitted by the signal source horn.

[0026] Step 3-3: Fix the bearing of the antenna pedestal at θ A direction, and the elevation at For the center, in the range of -5° ~ +5° rotating antenna seat elevation to horn scanning, and record the radar elevation difference road signal and the corresponding antenna seat elevation data, the elevation difference road signal detection processing, forming the elevation difference beam pattern, find out the elevation difference beam zero depth position, and read the corresponding antenna seat elevation value

[0027] Step 3-4: fixed antenna seat elevation in Direction, the side angle to θ A For the center, in the range of -5° ~ +5° rotating antenna seat side angle to horn scanning, and record the radar side angle difference road signal and the corresponding antenna seat side angle data, the side angle difference road signal detection processing, forming the azimuth difference beam pattern, find out the azimuth difference beam zero depth position, and read the corresponding antenna seat side angle value θ A ;

[0028] Step 3-5: calculate the side angle deviation ΔA e And the elevation deviation ΔE e :

[0029]

[0030] Step 3-6: the signal source and radar frequency to other frequency, through the horn to the radar emitting single frequency pulse signal, radar array beam pointing to the normal beam, start receiving signal source horn signal, repeat step 3-3, 3-4 and 3-5 steps, complete the radar all frequency point test, get ΔA e,i And ΔE e,i , that is, the i-th frequency point between the electrical axis and the optical axis of the side angle deviation and the elevation deviation.

[0031] Fourth step: ΔA e,i And ΔE e,i Binding in the radar servo software, correction of the electrical axis of the side angle and elevation indication data. The electrical axis of the side angle and elevation value and the mechanical axis of the side angle and elevation relationship is:

[0032]

[0033] Where, A′ i And E′ i The electrical axis of the side angle and elevation value, A and E are the antenna seat mechanical axis of the side angle and elevation value, that is, the servo side angle and elevation rotary variable value, through formula (2) for servo software correction, the realization of the electrical axis and mechanical axis matching.

[0034] Fifth step: the optical axis and the electrical axis matching calibration, the antenna seat mechanical axis azimuth pointing value θ′ A , elevation pointing Loosen the reference telescope's azimuth and elevation fixed nuts, adjust the azimuth and elevation fine screws, and make the reference telescope's "+" line align with the "+" line near the 80m loudspeaker. Then tighten the reference telescope's fixed nuts to match the optical axis with the electrical axis.

[0035] Thus, the three-axis matching and calibration of the electrical axis, the optical axis and the mechanical axis are realized.

[0036] Compared with the prior art, the present application has the following advantages: the azimuth deviation ΔA e and the elevation deviation ΔE e between the electrical axis and the optical axis are calculated by measurement e and ΔE e are bound in the radar servo software to correct the electrical axis azimuth and elevation indication data. The matching and calibration of the electrical axis and the mechanical axis are realized by the ingenious correction of the servo software. The matching of the optical axis and the electrical axis is realized by the matching and calibration of the optical axis and the electrical axis. Finally, the three-axis matching of the electrical axis, the optical axis and the mechanical axis is realized. The problem of the axis system matching and calibration of the machine phase scanning high-precision tracking radar is solved, and the machine phase scanning high-precision tracking is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a main step flow chart of a machine phase scanning high-precision tracking radar axis system matching and calibration method.

[0038] Figure 2 It is a machine phase scanning high-precision tracking radar antenna pedestal schematic diagram.

[0039] Figure 3 It is a phased array antenna position and loudspeaker and "+" line position schematic diagram. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0041] In combination with Figure 1 the present application, on the basis of completing the machine phase scanning high-precision tracking radar antenna pedestal level adjustment, the optical axis and the mechanical axis matching and calibration of the radar are completed by means of the optical reference telescope, the matching of the mechanical axis and the electrical axis is realized, and then the azimuth deviation ΔA e and the elevation deviation ΔE e between the electrical axis and the optical axis are calculated by measurement e and ΔE eThe electric axis and the elevation angle indication data are corrected in the radar servo software, the electric axis is matched and calibrated by the servo software correction, and finally the optical axis is matched and calibrated with the electric axis to realize the matching of the optical axis and the electric axis, and finally the matching of the electric axis, the optical axis and the mechanical axis is realized. The specific steps are as follows:

[0042] First step: high-precision tracking radar antenna pedestal is adjusted horizontally, as shown in Figure 2 .

[0043] Step 1-1: when the antenna pedestal (8) is adjusted horizontally, the locking nut (1) of the fixed base is loosened, so that the position of the base lower inclined iron (2) can be changed to adjust the levelness of the antenna pedestal;

[0044] Step 1-2: the antenna pedestal is zeroed in the azimuth and elevation, the electronic level (4) is placed on the top cover of the phased array surface (3) and fixed, then in the range of 360° azimuth, every 45°, the electronic level display value is observed, the base lower inclined iron (2) is knocked to make the antenna pedestal rise or fall to make the electronic level value as close to 0 as possible, and the electronic level display value in the direction is recorded, and the adjustment in 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315° eight directions is completed in turn;

[0045] Step 1-3: the levelness of the antenna pedestal is checked, the electronic level (4) is still fixed on the top cover of the phased array surface (3), and the inclination in 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315° eight directions is measured, and the maximum value and the minimum value are found in the eight direction measurement values, and the maximum non-parallelism of the antenna pedestal is obtained by subtraction and division by 2. If it is greater than θ Th (θ Th According to the value of the radar levelness requirement, such as taking θ Th =1.5′), the work of step 1-2 is redone; if it is less than θ Th , it is considered to meet the requirements, and the locking nut (1) of the fixed base is tightened after meeting the requirements.

[0046] Second step: the optical axis and the mechanical axis are matched and calibrated, including the azimuth axis matching and calibration and the elevation axis matching and calibration, to realize the matching of the mechanical axis and the optical axis, as shown in Figure 2 .

[0047] (1) azimuth axis matching and calibration:

[0048] Step 2-1: a point-like calibration object is selected at a distance of 1.5 km away from the antenna pedestal;

[0049] Step 2-2: Fix the theodolite (5) base on the elevation axis bracket (6) beside the phased array panel (3) (at the reference telescope (7) position), make the phased array panel (3) approximately horizontal, install the theodolite (5) and aim at the calibration object, adjust the theodolite (5) to be horizontal according to the theodolite manual;

[0050] Step 2-3: Aim the theodolite (5) ocular "+" line center at the calibration object, lock the theodolite (5) azimuth angle handwheel;

[0051] Step 2-4: Adjust the phased array panel (3) to be upward, and adjust the theodolite (5) ocular to be downward, so that the calibration object can be seen all the time, until the calibration object can just be seen from the theodolite (5) ocular;

[0052] Step 2-5: Check whether the theodolite (5) ocular "+" line center is aimed at the calibration object, adjust the antenna pedestal (8) azimuth angle to make the theodolite (5) ocular "+" line center aimed at the calibration object;

[0053] Step 2-6: Lower the phased array panel (3) to the initial position, rotate the theodolite (5) azimuth angle to make the theodolite (5) ocular "+" line center aimed at the calibration object again;

[0054] Step 2-7: Repeat the steps 2-4, 2-5 and 2-6, if the calibration object can be seen all the time in the "+" line center when the phased array panel (3) is elevated, it means that the theodolite (5) optical axis is parallel to the mechanical axis in the azimuth axis direction;

[0055] Step 2-8: Keep the positions of the antenna pedestal and the theodolite unchanged, loosen the reference telescope (7) azimuth angle fixing nut on the antenna pedestal, adjust the telescope (7) azimuth angle to make the reference telescope (7) "+" line vertical axis aimed at the calibration object, thus the radar optical axis is parallel to the mechanical axis in the azimuth axis direction.

[0056] (2) Elevation axis matching calibration

[0057] Step 2-9: Set up a bracket (9) beside the antenna pedestal, fix the theodolite (10) on the bracket, make the theodolite (10) ocular at the same height with the radar reference telescope, and adjust the theodolite (10) to be horizontal. Rotate the theodolite (10) azimuth angle and elevation angle, and aim at a point-like calibration object at a distance of 1.5 km, read and record the elevation angle data of the calibration object, loosen the reference telescope (7) elevation screw, adjust the telescope (7) elevation angle to make the "+" line center coincided with the calibration object, then tighten the reference telescope (7) fixing screw, thus the radar optical axis is matched with the mechanical axis.

[0058] Step 3: Measure the transverse and elevation direction electrical-optical axis mismatch angle υ between the electrical axis and the optical axis Tand υ E .

[0059] Step 3-1: As Figure 3 As shown, a microwave signal source is set up 80m away from the center of the phased array antenna (1). The center of the horn (2) is aligned with the center of the antenna (1). The back of the horn (2) is connected to the signal source (5) by an RF cable. A "+" line (3) is set up near the horn (2). The relative position of the "+" line (3) and the horn (2) is consistent with the relative position of the reference telescope (7) and the center of the antenna (1). The azimuth and elevation of the antenna mount are rotated so that the "+" line of the reference telescope (7) is aligned with the "+" line (3) near the horn. The hull angle θ of the antenna mount is recorded. A and elevation angle value

[0060] Step 3-2: First, the signal source and radar are tuned to the radar center frequency. The radar emits a single-frequency pulse signal through the horn. The radar array beam is set to the normal beam and begins to receive the signal emitted by the signal source horn.

[0061] Step 3-3: Fix the antenna mount angle at θ A Direction, elevation angle Centered on the radar, the antenna mount is rotated within a range of -5° to +5° to scan the horn, and the radar's elevation difference signal and the corresponding antenna mount elevation angle data are recorded. The elevation difference signal is then processed by detection to form an elevation difference beam pattern. The elevation difference beam null depth position is located, and the corresponding antenna mount elevation angle value is read.

[0062] Steps 3-4: Fix the antenna mount elevation angle at Direction, angle of hull in θ A Centered on the radar, the antenna mount angle is rotated within a range of -5° to +5° to scan the horn, and the radar's angle difference signal and the corresponding antenna mount angle data are recorded. The angle difference signal is then processed by detection to form an azimuth difference beam pattern. The azimuth difference beam null depth position is found, and the corresponding antenna mount angle value θ′ is read. A ;

[0063] Steps 3-5: Calculate the hull angle deviation ΔA between the electric axis and the optical axis. e and elevation angle deviation ΔE e :

[0064]

[0065] Steps 3-6: Tune the signal source and radar frequencies to other frequencies, transmit a single-frequency pulse signal to the radar via the horn, set the radar array beam direction to the normal beam, and begin receiving signals emitted by the signal source horn. Repeat steps 3-3, 3-4, and 3-5 to complete the testing of all radar frequencies and obtain ΔA.e,i and ΔE e,i , i.e. the deviation of the bearing angle and the elevation angle between the i-th frequency point electric axis and the optical axis.

[0066] Fourth step: ΔA e,i and ΔE e,i are bound in the radar servo software to correct the bearing angle and the elevation angle indication data of the electric axis. The relationship between the bearing angle and the elevation angle values of the electric axis and the bearing angle and the elevation angle of the mechanical axis is:

[0067]

[0068] wherein A' i and E' i are the bearing angle and the elevation angle values of the electric axis respectively, and A and E are the bearing angle and the elevation angle values of the antenna pedestal mechanical axis respectively, i.e. the bearing angle and the elevation angle rotary variable values of the servo, which are corrected by formula (2) to realize the matching of the electric axis and the mechanical axis.

[0069] Fifth step: matching and calibration of the optical axis and the electric axis, the antenna pedestal mechanical axis azimuth pointing value θ' A and the elevation pointing Loosen the reference telescope bearing angle and elevation angle fixing nuts on the antenna pedestal, adjust the bearing angle and the elevation angle micro-adjusting screws, and make the reference telescope "+" line align with the "+" line near the 80m loudspeaker, then tighten the reference telescope fixing nuts to realize the matching of the optical axis and the electric axis.

[0070] Thus, the matching and calibration of the electric axis, the optical axis and the mechanical axis are realized.

[0071] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0072] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, however, it should not be understood as the limitation of the scope of the present application. It should be noted that, for the ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for matching and calibrating the shafting of a mechanically scanned high precision tracking radar, characterized in that, The steps are as follows: First step: adjusting the level of the high-precision tracking radar antenna pedestal, specifically: Step 1-1: loosen the locking nut of the fixed base, change the position of the lower inclined iron of the base to adjust the level of the antenna pedestal; Second step: matching and calibrating the radar optical axis and mechanical axis, including side angle axis matching calibration and elevation angle axis matching calibration, to realize the matching of the mechanical axis and the optical axis, specifically: (1) Side angle axis matching calibration: Step 2-1: select a point-like calibration object at a distance of 1.5 km away from the antenna pedestal; Step 2-2: fix the theodolite installation base on the side of the phased array surface, adjust the theodolite to the horizontal position, and aim at the calibration object; Step 2-3: adjust the center of the "+ " line of the theodolite eyepiece to align with the calibration object, and lock the theodolite side angle brake handle; Step 2-4: adjust the phased array surface to tilt upward, and at the same time, adjust the theodolite eyepiece to tilt downward, until the boundary of the calibration object can still be observed from the theodolite eyepiece; Step 2-5: check whether the center of the "+ " line of the theodolite eyepiece is aligned with the calibration object, and adjust the antenna pedestal side angle to make the center of the "+ " line of the theodolite eyepiece aligned with the calibration object; Step 2-6: tilt the phased array surface to the starting position, and rotate the theodolite side angle axis to make the center of the "+ " line of the eyepiece aligned with the calibration object again; Step 2-7: repeat steps 2-4, 2-5, and 2-6, if the calibration object can always be in the center of the "+ " line when the phased array surface is tilted and observed through the theodolite eyepiece, it means that the theodolite optical axis is parallel to the mechanical axis in the direction of the side angle axis; Step 2-8: keep the positions of the antenna pedestal and the theodolite unchanged, loosen the side angle fixing nut of the reference telescope on the antenna pedestal, and adjust the side angle fine adjustment screw to make the longitudinal axis of the "+ " line of the reference telescope aligned with the calibration object. At this point, the radar optical axis is parallel to the mechanical axis in the direction of the side angle axis; (2) Elevation angle axis matching calibration Third step: Calculate the azimuth deviation ΔA between the electrical axis and the optical axis e and the elevation deviation ΔE e ; Fourth step: ΔA e and ΔE e The matching of the electrical axis and the mechanical axis is realized by correcting the data of the angle of elevation and the angle of bearing of the electrical axis in the radar servo software. Step 2-9: set up a support beside the antenna pedestal, fix the theodolite on the support, make the theodolite eyepiece at the same height as the radar reference telescope, adjust the theodolite to the horizontal position, rotate the theodolite side angle axis and elevation angle axis, and aim at the point-like calibration object at a distance of 1.5 km away, read and record the elevation angle data of the calibration object, loosen the elevation screw of the reference telescope, adjust the elevation axis of the telescope to make the center of the "+ " line coincide with the calibration object, and then tighten the installation screw of the reference telescope. At this point, the radar optical axis is matched with the mechanical axis; 2. The method of claim 1, wherein the method further comprises: Fifth step: matching and calibrating the optical axis and electrical axis, including side angle axis matching calibration and elevation angle axis matching calibration, to realize the matching of the optical axis and the electrical axis, and finally realize the matching calibration of the three axes of the electrical axis, the optical axis, and the mechanical axis. First step: adjusting the level of the high-precision tracking radar antenna pedestal, specifically: Step 1-1: loosen the locking nut of the fixed base, change the position of the lower inclined iron of the base to adjust the level of the antenna pedestal; Step 1-2: The antenna seat is zeroed, an electronic level is placed on the phased array surface top cover and fixed, and in the azimuth 360° range, every 45°, the electronic level display value is observed, the antenna seat is raised or lowered by knocking the lower inclined iron of the base, the electronic level display value is close to 0, and the azimuth electronic level display value is recorded. The adjustment of 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315° is completed in sequence. Step 1-3: Check the levelness of the antenna pedestal, fix the electronic level on the top cover of the phased array array surface, measure the inclination in 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315° eight directions, find a maximum value and a minimum value in the eight direction measurement values, subtract and divide by 2, that is, the maximum non-parallelism of the antenna pedestal is obtained, if it is greater than the threshold value θ Th , then redo the work of steps 1-2; if it is less than θ Th , it is considered to meet the requirements, and the locking nut of the fixed pedestal is tightened after meeting the requirements.

3. The method of claim 1, wherein the method further comprises: Thirdly, the azimuth deviation ΔA between the electric axis and the optical axis is calculated e and the elevation deviation ΔE e , specifically: Step 3-1: A microwave signal source horn is placed 80m away from the center of the phased array antenna, the horn is aligned with the antenna, the horn is linked with the signal source by a RF cable, a "+" line is placed near the horn, the relative position of the "+" line and the horn is consistent with the relative position of the reference telescope and the antenna center, the azimuth and elevation of the antenna pedestal is rotated to make the "+" line of the reference telescope align with the "+" line near the horn, and the azimuth value θ and the elevation value φ of the antenna pedestal are recorded A and the elevation value Step 3-2: The signal source and the radar are first adjusted to the radar center frequency, a single frequency pulse signal is emitted by the radar through the loudspeaker, and the radar array beam pointing is set to the normal beam, and the signal emitted by the signal source loudspeaker is started to be received. Step 3-3: fix the antenna pedestal azimuth angle at θ A direction, the elevation angle is centered at φ sweep the horn in the range of -5°~+5° around the antenna pedestal elevation angle, record the radar elevation difference channel signal and the corresponding antenna pedestal elevation angle data, detect the elevation difference channel signal to form the elevation difference beam pattern, find the elevation difference beam null depth position, and read the corresponding antenna pedestal elevation angle value Step 3-4: fix the elevation angle of the antenna pedestal at θ0, and turn the beam angle of the antenna pedestal in the direction of θ A , in the range of -5°~+5°, scan the horn by the beam angle of the antenna pedestal, and record the beam difference channel signal of the radar and the corresponding beam angle data of the antenna pedestal, detect the beam difference channel signal to form the direction difference beam pattern, find the zero depth position of the direction difference beam, and read the corresponding beam angle value θ′ A of the antenna pedestal. Steps 3-5: Calculate the azimuth angle deviation ΔA between the electrical axis and the optical axis e and the elevation angle deviation ΔE e : Step 3-6: Adjust the signal source and radar frequency to other frequency points, transmit single-frequency pulse signals to the radar through the loudspeaker, set the radar array beam pointing direction to the normal beam, start receiving the signals emitted by the loudspeaker of the signal source, repeat steps 3-3, 3-4 and 3-5, complete the test of all frequency points of the radar, and obtain ΔA e,i and ΔE e,i , that is, the deviation of the beam angle and the elevation angle between the electric axis of the i-th frequency point and the optical axis.

4. The method of claim 1, wherein, Fourth step, ΔA e,i and ΔE e,i The fourth step is to install the radar servo software, correct the electric shaft and the angle of the angle and elevation data, and realize the matching of the electric shaft and the mechanical shaft. The relationship between the azimuth and elevation values of the electric axis and the mechanical axis is: Among them, A′ i and E′ i The values ​​are the electric shaft hull angle and elevation angle, respectively. A and E are the antenna mount mechanical shaft hull angle and elevation angle, respectively. These are the servo hull angle and elevation angle rotation values. The servo software is corrected by formula (2), thus achieving the matching between the electric shaft and the mechanical shaft.

5. The method of claim 3, wherein the method further comprises: The fifth step is to perform optical axis and electric axis matching calibration, including azimuth axis matching calibration and elevation axis matching calibration, to realize optical axis and electric axis matching, and finally realize electric axis, optical axis and mechanical axis three-axis matching calibration, which is specifically: The azimuth mechanical axis of the antenna pedestal is pointed to a value θ' A , the elevation is pointed to a value φ Loosen the reference telescope base angle and elevation fixing nuts on the antenna pedestal, adjust the base angle and elevation fine adjustment screws, and make the reference telescope "+" line align with the "+" line near the 80 m horn. Then, tighten the reference telescope fixing nuts, and realize the matching of the optical axis and the electrical axis. Thus, the matching of the electrical axis, the optical axis and the mechanical axis is realized.

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