Radar antenna pointing error compensation method

Abstract

The invention discloses a radar antenna pointing error compensation method, which establishes a pointing error correction formula to realize compensation by recording and analyzing a relation among a pointing error, an inertial measurement equipment value and an array surface structure temperature, and mainly comprises the following steps of: monitoring and recording the array surface structure temperature, extracting pointing error data, and compensating the pointing error. Selecting and recording values of the inertial measurement equipment, analyzing data, establishing a correction formula, and verifying a compensation effect. According to the invention, the problem of antenna pointing error caused by the adoption of inertial measurement equipment by a high-precision radar needing to be deployed in a motorized manner is solved.

Description

Technical Field

[0001] The invention relates to the field of testing technology, in particular to a radar antenna pointing error compensation method. Background Art

[0002] Pointing accuracy is a core indicator of phased array radar antennas, which directly determines the radar system's ability to determine the position of long-distance targets. Pointing accuracy is generally characterized by pointing error. The pointing error of phased array antennas mainly includes errors caused by telecommunication devices in the antenna array, such as the amplitude phase error of the T / R channel or phase shifter and the consistency error of the feed network. For active phased array antennas that require azimuth mechanical rotation, pointing errors also come from errors in the azimuth rotation of the antenna array and the deformation of the antenna array structure caused by the thermal temperature field.

[0003] The error caused by the azimuth rotation of the antenna array is that the antenna array, which is generally installed on a turntable, cannot be rotated in azimuth in an absolutely horizontal posture due to actual processing and assembly errors. Instead, it rotates at a certain tilt angle, which will cause the antenna array to change its pointing direction. In addition, the conventional method for obtaining the array attitude is to use an angle sensor to measure the pitch angle of the array, and to use a combination of a north finder and an azimuth encoder to obtain the array azimuth. The accuracy of the angle sensors on the market cannot meet the requirements of high-precision radars. The combination of a north finder and an azimuth encoder can meet the requirements of azimuth accuracy, but this method takes a long time and cannot meet the requirements of rapid startup after the radar is deployed in a motorized manner. Therefore, radars are beginning to install inertial measurement equipment in the antenna array, and after a one-time calibration of the antenna array to calibrate the inertial measurement equipment, the inertial measurement equipment can be used to obtain the array pointing direction in real time when the array rotates in azimuth, which can eliminate the error from the azimuth rotation of the antenna array and meet the radar's requirements for accuracy and response time.

[0004] Due to practical limitations, generally only a few inertial measurement devices are installed at several local positions in the array to characterize the overall state of the array that reflects the array's pointing direction. When the ambient temperature is consistent with that of the antenna array, and the radar is not radiating and does not cause changes in the array structure's temperature field, the inertial measurement device installation position has not deformed relative to the calibration, so there is no error between the inertial measurement device's measurement value and the array's pointing direction. However, the actual situation is that the radar will radiate at different ambient temperatures, causing changes in the array structure's temperature field, and the inertial measurement device installation position is inconsistent with the overall state of the array, resulting in an error between the measurement value and the array's pointing direction, and the radar's pointing accuracy does not meet the requirements. This situation is particularly evident in large-caliber, high-power, and high-precision radars that require mobile deployment.

[0005] There have been studies on pointing error analysis and compensation, but most of them are aimed at reflector antennas. Some studies on the pointing error of phased array antennas did not use inertial measurement equipment to obtain the attitude changes when the array face rotates in azimuth in real time, so the pointing error caused by the mechanical rotation of the antenna array face cannot be eliminated. Some phased array radars have applications in which inertial measurement equipment is installed in the antenna array face, but they are still at the stage of directly using inertial measurement equipment data for array calibration. The pointing error caused by the inconsistency between the local deformation of the inertial measurement equipment installation position and the overall deformation of the array face has not been analyzed and compensated, which cannot meet the pointing accuracy requirements of large-aperture, high-power, and high-precision radars that need to be motorized. Summary of the invention

[0006] In view of the problems existing in the prior art, for the high-precision radars that need to be deployed in a motorized manner, inertial measurement devices are installed in the array to obtain high-precision array pointing in real time to meet the requirements of array attitude measurement accuracy and response time. The pointing error generated by the inconsistency between the local deformation of the inertial measurement device installation position and the overall deformation of the array causes a radar antenna pointing error compensation method.

[0007] The purpose of the present invention is achieved through the following technical solutions.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A radar antenna pointing error compensation method is provided, which realizes compensation by recording and analyzing the relationship between pointing error, inertial measurement device value and array surface structure temperature to establish a pointing error correction formula. The steps mainly include monitoring and recording the array surface structure temperature, extracting pointing error data, selecting and recording inertial measurement device value, analyzing data and establishing correction formula, and verifying compensation effect.

[0010] The monitoring and recording of the array surface structure temperature first determines the position on the array surface structure that needs to monitor the temperature according to the array surface structure morphology, mainly the main stress node, and then installs the contact thermocouple temperature measuring sensor with mature technology currently available on the market at the selected position, and fixes the sensor on the array surface structure by clamps, and arranges the sensor cable reasonably in the antenna array surface, and connects all of them to the data acquisition device, and the data acquisition device connects the signal to the radar system through the serial port to Ethernet module. The radar system obtains the temperature measured by all the temperature measuring sensors through parsing according to the data acquisition device and the serial port to Ethernet protocol, and realizes the display and storage of the temperature by developing software in the radar system, thereby realizing the monitoring and recording of the array structure temperature, and can record the temperature state of the array surface structure each time the radar tracks the target.

[0011] The extraction of the pointing error data adopts the pointing calibration method of medium and large radars based on tracking precise orbit satellites reported in existing literature, and obtains the pointing measurement value of the radar relative to the target precise orbit satellite and the precise orbit data of the precise orbit satellite converted to the pointing relative to the geodetic coordinates of the radar center, that is, the true value of the pointing of the radar relative to the target precise orbit satellite. The difference between the measured value and the true value is the pointing error of the radar tracking the target this time, which is generally expressed by a curve with the horizontal coordinate being the radar pointing azimuth or pitch angle and the vertical coordinate being the pointing error corresponding to different pointing azimuths or pitch angles. Through the correction processing algorithm in the calibration method, the pointing error curve can be corrected accordingly to reduce the peak-to-peak value of the error curve, but the curve cannot be flattened into a straight line, that is, the pointing error is different under different pointing azimuths or elevation angles. In order to determine the clear error value obtained by a single radar tracking that can be substituted into data analysis, it is assumed that there is a horizontal center line of the pointing error, that is, the pointing error curve is simplified into a horizontal straight line for consideration, and the average value of all errors in the error curve is taken as the specific error value corresponding to this straight line, and this value is used as the pointing error data obtained by a single radar tracking of a precise orbit satellite.

[0012] The selected record of the inertial measurement device value is that when a general radar is working, the azimuth will rotate along with the movement of the target, so the reading of the inertial measurement device installed in the array will change along with the rotation of the array azimuth. The reading of the inertial measurement device in azimuth includes a small change caused by the non-levelness of the large plate and a large change caused by the rotation of the azimuth. The reading of the inertial measurement device in pitch includes a small change caused by the non-levelness of the large plate and a large change caused by the rotation of the pitch if the radar array also rotates along with the movement of the target in the pitch direction. If the radar array does not rotate in the pitch direction to follow the movement of the target and only tracks the target through electronic scanning, it will only include small changes caused by the unevenness of the large plate. In order to avoid the inertial measurement device values ​​used for data analysis not being a unified benchmark due to the different azimuths and pitch angles of the antenna array at the beginning of each operation, and to avoid the interference of small changes caused by the unevenness of the large plate on the data analysis, the radar is set to be at a fixed angle in azimuth and pitch before each operation, and the inertial measurement device values ​​before the radar is about to start radiation are recorded for subsequent data analysis.

[0013] The data analysis and correction formula is established. For the data such as the array surface structure temperature, pointing error and inertial measurement device value obtained above, the data are grouped and processed by data processing methods such as data fitting, and the relationship between the pointing error data and other data is analyzed. Since the inertial measurement device value is related to the local deformation of the array surface structure at the installation position of the inertial measurement device, and there is a linear relationship between the local deformation of the array surface structure and the array surface structure temperature, the array surface structure temperature and the inertial measurement device value are grouped together (the inertial measurement device value is the dependent variable, and the array surface structure temperature is the independent variable) for data analysis. The difference is the error between the pointing measurement value relative to the target precise orbit satellite calculated by the radar after substituting the inertial measurement device value into the radar system and the true value. That is, there is a relationship between the pointing error and the inertial measurement device value. Therefore, the pointing error and the inertial measurement device value are grouped together (the pointing error is the dependent variable, and the inertial measurement device value is the independent variable) for data analysis to find out the relationship between the pointing error and other data. The above relationship is expressed through a formula, and a correction formula for the pointing error relative to other data is established to accurately reflect the pointing error, which can be provided to the radar system for substitution into the correction of the pointing measurement value.

[0014] The compensation effect verification means that the radar system, in addition to the number of times of tracking the fine orbit satellite for data analysis to establish the correction formula, tracks the fine orbit satellite again for multiple times, substitutes the correction formula into the radar system, corrects the target pointing measurement value, and after obtaining the target pointing measurement correction value, compares it with the target pointing true value, calculates the corrected pointing error, and compares it with the pointing accuracy requirement put forward for the radar system to determine whether the pointing accuracy requirement is met. If so, it indicates that the established correction formula meets the pointing error correction requirement, and the pointing error compensation of the radar antenna array structure factor is completed. If not, the uncorrected pointing error obtained by the fine orbit satellite tracking used by the radar to verify the correction effect of the correction formula is also put into the data source for data analysis, and data fitting and other analyses are re-performed together with the previous data to re-find and establish the relationship between the pointing error and other data, so as to update the correction formula, and verify the new correction formula by tracking the fine orbit satellite again. The above process is repeated until the corrected pointing error meets the pointing accuracy requirement put forward for the radar system.

[0015] Several inertial measurement devices are used, and temperature sensors are arranged according to the actual state of the array structure. Data analysis is performed on the pointing error obtained by the actual radar tracking to obtain the pointing error correction formula. This breaks through the traditional design method of simply increasing the thickness of the array to improve the array stiffness to ensure the pointing accuracy of the antenna array after the aperture of the active phased array radar is increased. This can break the aperture design limitation of the active phased array radar antenna array that needs to be mobile deployed, and achieve the lightweight, mobile and high pointing accuracy of the large-aperture active phased array radar antenna array.

[0016] Sensors capable of real-time temperature measurement are arranged according to the actual state of the array structure and connected to the radar system. By establishing a correction formula relative to the array structure temperature and the inertial measurement device value, the radar system can realize real-time correction of the pointing accuracy.

[0017] Modern mathematical software is used to directly fit and analyze the pointing error, inertial measurement device value and array structure temperature, and iterative deduction is performed through continuous data accumulation to establish a correction formula that meets the correction accuracy requirements.

[0018] Compared with the prior art, the advantages of the present invention are: 1. It adopts several inertial measurement devices, arranges temperature sensors according to the actual state of the array structure, and performs data analysis in combination with the pointing error obtained by the actual radar tracking to obtain the pointing error correction formula, breaking through the traditional design method of simply increasing the thickness of the array to improve the array stiffness in order to ensure the pointing accuracy of the antenna array after the caliber of the active phased array radar antenna array is increased, thereby breaking the caliber design limitation of the active phased array radar antenna array that needs to be deployed in a motorized manner, and realizing the lightness, motorization and high pointing accuracy of the large-caliber active phased array radar antenna array;

[0019] 2. Arrange sensors that can measure temperature in real time according to the actual state of the array structure and connect them to the radar system. By establishing a correction formula relative to the array structure temperature and the inertial measurement device value, the radar system can correct the pointing accuracy in real time, overcoming the shortcoming that the traditional antenna array cannot be corrected in real time after a calibration correction, and further improving the pointing accuracy of the antenna array;

[0020] 3. Use modern mathematical software to directly fit and analyze the pointing error, inertial measurement device value and array structure temperature, and iteratively deduce by continuously accumulating data to establish a correction formula that meets the correction accuracy requirements, breaking through the traditional correction formula establishment model that uses mechanical theory to establish the relationship between deformation and temperature according to the structural form, which cannot be applied to complex array structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of radar antenna pointing error compensation method.

[0022] Figure 2 This is a schematic diagram of the radar antenna array model (front).

[0023] Figure 3 This is a schematic diagram of the radar antenna array model (back).

[0024] Figure 4 This is a partially enlarged schematic diagram of the radar antenna array model.

[0025] Among them: 1. antenna array, 2. antenna array pitch support hydraulic cylinder, 3. turntable, 4. large plate, 5. platform, 6. inertial measurement equipment, 7. temperature sensor, 101. antenna array structure. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, the present invention provides a radar antenna pointing error compensation method, which realizes compensation by recording and analyzing the relationship between the pointing error, the inertial measurement device value and the temperature of the array surface structure 101 to establish a pointing error correction formula. The steps mainly include monitoring and recording the temperature of the array surface structure 101, extracting the pointing error data, selecting and recording the inertial measurement device value, analyzing the data and establishing the correction formula, and verifying the compensation effect.

[0028] The monitoring and recording of the temperature of the array surface structure 101 is firstly to determine the position of the array surface structure 101 that needs to monitor the temperature according to the shape of the array surface structure 101, mainly the main stress node, and then install the contact thermocouple temperature sensor 7 with mature technology currently available on the market at the selected position, and fix the sensor 7 on the array surface structure 101 by clamping, and reasonably plan and arrange the cables of the sensor 7 in the antenna array surface 1, and all connect them to the data acquisition device, and the data acquisition device connects the signal to the radar system through the serial port to Ethernet module. The radar system obtains the temperature measured by all the temperature sensors 7 through analysis according to the data acquisition device and the serial port to Ethernet protocol, and realizes the display and storage of the temperature by developing software in the radar system, thereby realizing the monitoring and recording of the temperature of the array surface structure 101, and the temperature state of the array surface structure 101 can be recorded each time the radar tracks the target.

[0029] The extraction of the pointing error data adopts the pointing calibration method of medium and large radars based on tracking precise orbit satellites reported in existing literature, and obtains the pointing measurement value of the radar relative to the target precise orbit satellite and the precise orbit data of the precise orbit satellite converted to the pointing relative to the geodetic coordinates of the radar center, that is, the true value of the pointing of the radar relative to the target precise orbit satellite. The difference between the measured value and the true value is the pointing error of the radar tracking the target this time, which is generally expressed by a curve with the horizontal coordinate being the radar pointing azimuth or pitch angle and the vertical coordinate being the pointing error corresponding to different pointing azimuths or pitch angles. Through the correction processing algorithm in the calibration method, the pointing error curve can be corrected accordingly to reduce the peak-to-peak value of the error curve, but the curve cannot be flattened into a straight line, that is, the pointing error is different under different pointing azimuths or elevation angles. In order to determine the clear error value obtained by a single radar tracking that can be substituted into data analysis, it is assumed that there is a horizontal center line of the pointing error, that is, the pointing error curve is simplified into a horizontal straight line for consideration, and the average value of all errors in the error curve is taken as the specific error value corresponding to this straight line, and this value is used as the pointing error data obtained by a single radar tracking of a precise orbit satellite.

[0030] The selected record of the inertial measurement device value is that when a general radar is working, the azimuth will rotate along with the movement of the target, so the reading of the inertial measurement device 6 installed in the array 1 will change along with the rotation of the array azimuth. The reading of the inertial measurement device 6 in azimuth includes a small change caused by the non-leveling of the large plate 4 and a large change caused by the rotation of the azimuth. The reading of the inertial measurement device 6 in pitch includes a small change caused by the non-leveling of the large plate 4 and a large change caused by the rotation of the pitch if the radar array 1 also rotates along with the movement of the target in the pitch direction. If the radar array does not rotate in the pitch direction to follow the movement of the target and only tracks the target through electronic scanning, it only includes small changes caused by the unevenness of the large plate 4. In order to avoid the inertial measurement device values ​​used for data analysis not being a unified benchmark due to the antenna array 1 being in different azimuths and pitch angles at the beginning of each operation of the radar, and to avoid the interference of small changes caused by the unevenness of the large plate 4 on the data analysis, the radar is set to be at a fixed angle in azimuth and pitch before each operation, and the inertial measurement device values ​​before the radar is about to start radiation are recorded for subsequent data analysis.

[0031] The data analysis and correction formula is established. For the data such as the array surface structure 101 temperature, pointing error and inertial measurement device value obtained above, the data are grouped and processed by data processing methods such as data fitting, and the relationship between the pointing error data and other data is analyzed. Since the inertial measurement device value is related to the local deformation of the array surface structure 101 at the installation position of the inertial measurement device 6, and there is a linear relationship between the local deformation of the array surface structure 101 and the temperature of the array surface structure 101, the temperature of the array surface structure 101 and the inertial measurement device value are grouped together (the inertial measurement device value is the dependent variable, and the temperature of the array surface structure 101 is the independent variable) for correction. Data analysis, since the pointing error is the error between the pointing measurement value relative to the target precise orbit satellite and the true value calculated by the radar after substituting the inertial measurement device value into the radar system, that is, there is a mutual relationship between the pointing error and the inertial measurement device value, the pointing error and the inertial measurement device value are grouped together (pointing error is the dependent variable, and the inertial measurement device value is the independent variable) for data analysis, find out the relationship between the pointing error and other data, express the above relationship through a formula, and establish a correction formula for the pointing error relative to other data to accurately reflect the pointing error, so that it can be provided to the radar system for substitution to correct the pointing measurement value.

[0032] The compensation effect verification means that the radar system, in addition to the number of times of tracking the fine orbit satellite for data analysis to establish the correction formula, tracks the fine orbit satellite again for multiple times, substitutes the correction formula into the radar system, corrects the target pointing measurement value, and after obtaining the target pointing measurement correction value, compares it with the target pointing true value, calculates the corrected pointing error, and compares it with the pointing accuracy requirement put forward for the radar system to determine whether the pointing accuracy requirement is met. If so, it indicates that the established correction formula meets the pointing error correction requirement, and the pointing error compensation of the radar antenna array 1 structural factor is completed. If not, the uncorrected pointing error obtained by the fine orbit satellite tracking performed by the radar for verifying the correction effect of the correction formula is also put into the data source for data analysis, and data fitting and other analyses are re-performed together with the previous data to re-find and establish the relationship between the pointing error and other data, so as to update the correction formula, and verify the new correction formula by tracking the fine orbit satellite again, and repeat the above process until the corrected pointing error meets the pointing accuracy requirement put forward for the radar system.

[0033] A plurality of inertial measurement devices 6 are used, and temperature sensors 7 are arranged according to the actual state of the array surface structure 101. The pointing error obtained by the radar actual tracking is analyzed to obtain a pointing error correction formula, thereby breaking through the traditional design method of simply increasing the thickness of the array surface 1 to improve the stiffness of the array surface 1 to ensure the pointing accuracy of the antenna array surface 1 after the caliber of the active phased array radar antenna array surface 1 is increased. Thus, the caliber design limitation of the active phased array radar antenna array surface 1 that needs to be deployed in a motorized manner can be broken, and the large-caliber active phased array radar antenna array surface 1 can be made thinner, more motorized, and have high pointing accuracy.

[0034] A sensor 7 capable of real-time temperature measurement is arranged according to the actual state of the array surface structure 101 and connected to the radar system. By establishing a correction formula relative to the temperature of the array surface structure 101 and the value of the inertial measurement device, the radar system can correct the pointing accuracy in real time, thus overcoming the deficiency that the traditional antenna array surface 1 cannot be corrected in real time after a calibration correction, and further improving the pointing accuracy of the antenna array surface 1.

[0035] The pointing error, inertial measurement device value and array structure 101 temperature are directly fitted and analyzed using modern mathematical software, and the correction formula that meets the correction accuracy requirements can be established by iterative deduction through continuous data accumulation, breaking through the traditional correction formula establishment model that establishes the relationship between deformation and temperature according to the structural form through mechanical theory and cannot be applied to complex array structure 101 forms.

[0036] The invention arranges temperature sensors in an array structure reasonably to monitor and record the array structure temperature, uses radar to actually track a precise orbit satellite to extract pointing error data, records the initial value of an inertial measurement device before the radar tracks a target each time, performs group fitting and analysis on the above data, establishes an inertial measurement device value correction formula, substitutes the formula into the radar to obtain a correction value for target pointing measurement, compares the error correction effect with the target pointing true value, and through multiple iterative analyses, achieves that the error between the target pointing measurement correction value and the true value meets the requirement of pointing accuracy, thereby establishing a correction formula, and finally writing the formula into the radar system to realize real-time correction of target pointing, thereby solving the problem of antenna pointing error caused by a high-precision radar that needs to be deployed in a motorized manner after adopting an inertial measurement device.

Claims

1. A radar antenna pointing error compensation method, characterized in that By recording and analyzing the relationship between pointing error, inertial measurement device value and array structure temperature, a pointing error correction formula is established to achieve compensation. The steps mainly include monitoring and recording the array structure temperature, extracting pointing error data, selecting and recording inertial measurement device values, analyzing data and establishing correction formulas, and verifying compensation effects.

2. A radar antenna pointing error compensation method according to claim 1, characterized in that The monitoring record of the array surface structure temperature is first determined according to the array surface structure morphology. The position of the array surface structure that needs to monitor the temperature is mainly the main stress node. Secondly, the contact thermocouple temperature sensor with mature technology currently available on the market is installed at the selected position, and the sensor is pressed and fixed on the array surface structure by a clip. The sensor cable is reasonably planned and arranged in the antenna array surface and all connected to the data acquisition device. The data acquisition device connects the signal to the radar system through the serial port to Ethernet module. The radar system obtains the temperature measured by all temperature sensors through analysis according to the data acquisition device and the serial port to Ethernet protocol, and the temperature is displayed and saved by developing software in the radar system.

3. A radar antenna pointing error compensation method according to claim 1, characterized in that The extraction of the pointing error data is to adopt a pointing calibration method based on tracking precise orbit satellites for medium and large radars, respectively obtain the pointing measurement value of the radar relative to the target precise orbit satellite and the precise orbit data of the precise orbit satellite converted to the pointing relative to the geodetic coordinates of the radar center, that is, the true value of the pointing of the radar relative to the target precise orbit satellite, and calculate the difference between the measured value and the true value, which is the pointing error of the radar tracking the target this time, and express it with a curve whose abscissa is the radar pointing azimuth or pitch angle and ordinate is the pointing error corresponding to different pointing azimuths or pitch angles. Through the correction processing algorithm in the calibration method, the pointing error curve is corrected accordingly to reduce the peak-to-peak value of the error curve, but the curve cannot be flattened into a straight line, that is, the pointing error is different at different pointing azimuths or pitch angles. In order to determine the clear error value obtained by a single tracking of the radar that can be substituted into data analysis, it is assumed that there is a horizontal midline of the pointing error, that is, the pointing error curve is simplified as a horizontal straight line for consideration, and the average value of all errors in the error curve is taken as the specific error value corresponding to this straight line, and this value is taken as the pointing error data obtained by a single tracking of the precise orbit satellite by the radar.

4. A radar antenna pointing error compensation method according to claim 1, characterized in that The selected record of the inertial measurement device value, the reading of the inertial measurement device installed in the array will change with the rotation of the array azimuth, the reading of the inertial measurement device in azimuth, includes a small change caused by the non-levelness of the large plate and a large change caused by the rotation of the azimuth, and the reading of the inertial measurement device in pitch, if the radar array also rotates in the pitch direction following the movement of the target, then it includes a small change caused by the non-levelness of the large plate and a large change caused by the pitch rotation, if the radar array does not rotate in the pitch direction following the movement of the target, and only tracks the target through electronic scanning, then it only includes a small change caused by the non-levelness of the large plate, set the radar azimuth and pitch to be at a fixed angle before each work, and record the inertial measurement device value before the radar is about to start radiation work for subsequent data analysis.

5. A radar antenna pointing error compensation method according to claim 1, characterized in that The data analysis and correction formula is established. For the data such as the array surface structure temperature, pointing error and inertial measurement device value obtained above, the data are grouped and processed by data processing methods such as data fitting, the relationship between the pointing error data and other data is analyzed, the array surface structure temperature and the inertial measurement device value are grouped together for data analysis, the pointing error and the inertial measurement device value are grouped together for data analysis, the relationship between the pointing error and other data is found, the above relationship is expressed through a formula, and a correction formula for the pointing error relative to other data is established, which is used to accurately reflect the pointing error and is provided to the radar system for substitution into the correction of the pointing measurement value.

6. A radar antenna pointing error compensation method according to claim 1, characterized in that The compensation effect verification means that the radar system, in addition to the number of times of tracking the fine orbit satellite for data analysis to establish the correction formula, tracks the fine orbit satellite again for multiple times, substitutes the correction formula into the radar system, corrects the target pointing measurement value, and after obtaining the target pointing measurement correction value, compares it with the target pointing true value, calculates the corrected pointing error, and compares it with the pointing accuracy requirement put forward for the radar system to determine whether the pointing accuracy requirement is met. If so, it indicates that the established correction formula meets the pointing error correction requirement, and the pointing error compensation of the radar antenna array structure factor is completed. If not, the uncorrected pointing error obtained by the fine orbit satellite tracking used by the radar to verify the correction effect of the correction formula is also put into the data source for data analysis, and data fitting and other analyses are re-performed together with the previous data to re-find and establish the relationship between the pointing error and other data, so as to update the correction formula, and verify the new correction formula by tracking the fine orbit satellite again. The above process is repeated until the corrected pointing error meets the pointing accuracy requirement put forward for the radar system.

7. A radar antenna pointing error compensation method according to claim 1, characterized in that: Several inertial measurement devices are used, and temperature sensors are arranged according to the actual state of the array structure. Data analysis is performed on the pointing error obtained by the actual radar tracking to obtain the pointing error correction formula. This breaks through the traditional design method of simply increasing the thickness of the array to improve the array stiffness to ensure the pointing accuracy of the antenna array after the aperture of the active phased array radar is increased. This can break the aperture design limitation of the active phased array radar antenna array that needs to be mobile deployed, and achieve the lightweight, mobile and high pointing accuracy of the large-aperture active phased array radar antenna array.

8. A radar antenna pointing error compensation method according to claim 1, characterized in that Sensors capable of real-time temperature measurement are arranged according to the actual state of the array structure and connected to the radar system. By establishing a correction formula relative to the array structure temperature and the inertial measurement device value, the radar system can realize real-time correction of the pointing accuracy.

9. A radar antenna pointing error compensation method according to claim 1, characterized in that Modern mathematical software is used to directly fit and analyze the pointing error, inertial measurement device value and array structure temperature, and iterative deduction is performed through continuous data accumulation to establish a correction formula that meets the correction accuracy requirements.

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