卫星地面测角系统环境温度误差补偿方法

Method of Environment Temperature Error Compensation for Satellite Ground Angle Measurement System

随着卫星总装、集成与测试(AIT)过程测角精度的不断提高,其对环境因素的敏感程度也急剧上升。针对环境温度扰动导致的测角示值波动过大、测角精度无法进一步提高、微小角度甚至无法测量的问题,提出一种环境温度误差补偿方法。通过分析电子水平仪转动实际轨迹与理想轨迹之间夹角的周期性变化规律,对任意转角位置角度误差进行实时解算,并引入卫星地面测角的角度传递模型,达到补偿环境温度误差的效果。标定试验结果表明:该方法可将系统综合测角精度从10″提高至3″,重复精度提高至1.1″,能实现卫星自动测角系统测量精度3″的突破,可应用于卫星装配测试,为高分辨率遥感卫星的研制提供支撑。

With the continuous improvement of satellite AIT(assembly,integration and test)process angle measurement accuracy,its sensitivity to environmental factors rises sharply.Aiming at the problems that the fluctuation of displayed angle measurement values is large due to environmental temperature disturbance,the accuracy of angle measurement can not be further improved and tiny angle can not even be recognized,a method for compensating environmental temperature error is proposed.By analyzing the periodical variation characteristics of the angular differences between actual and ideal trajectories of the electronic level,the angle error of any transfer position is calculated in real-time and the angle transformation model of the satellite ground angle measurement is introduced to compensate the environmental temperature error.The calibration results show that the method increases the comprehensive angle measurement accuracy from 10″to 3″and increases the stability of the indication to 1.1″.This method achieves a breakthrough in the accuracy of 3″of the satellite automatic angle measurement system,which is applied to satellite AIT processing and lays the foundation of high-resolution remote sensing satellite development.