惯导辅助星敏感器天文定位时观星精度评价方法  

Evaluation Method for Stargazing Accuracy during Astronomical Positioning of Star Sensors Assisted by Inertial Navigation

作　　者：王常虹[1] 贾建峰 李葆华[1] WANG Changhong;JIA Jianfeng;LI Baohua(Space Control and Inertial Technology Research Center,Harbin Institute of Technology,Harbin 150001)

机构地区：[1]哈尔滨工业大学空间控制与惯性技术研究中心,哈尔滨150001

出　　处：《导航与控制》2024年第5期154-162,共9页Navigation and Control

基　　金：黑龙江省头雁计划(编号:AUEA5640209120)。

摘　　要：针对惯性导航辅助星敏感器天文定位时,面临从拍摄到的多颗恒星中选择精度高的观测星作为导航星的问题,提出了一种基于点光源的物像共轭的观星精度评价方法。该方法将星敏感器识别成功的恒星矢量转换到与星敏感器各个轴相互平行的地平坐标系,通过计算识别恒星的物方矢量和像方矢量所夹锐角的值对观星精度进行评价。精度评价后将精度高的观测星作为导航星,应用到惯性辅助的星敏感器天文定位中。外场数据处理结果表明,该方法能够有效选出精度高的导航星,所选择出的导航星定位结果比选择前天文定位得到的定位精度高,而且数据方差和标准差低1~3个数量级。In order to solve the problem of selecting high-precision observation stars from multiple stars as navigation star points in the astronomical positioning of inertial navigation-aided star sensors,a stargazing accuracy evaluation method based on object image conjugation based on point light source was proposed.In this method,the star vector successfully recognized by the star sensor is converted into a horizon coordinate system parallel to each axis of the star sensor,and the stargazing accuracy is evaluated by calculating the values of the acute angles between the object vector and the image vector of the star recognition.After the accuracy evaluation,the observation star with high accuracy is used as the navigation star and applied to the astronomical positioning of the inertial-assisted star sensor.The results of field data processing show that the proposed method can effectively select navigation stars with high accuracy,and the positioning results of the selected navigation stars are higher than those obtained by astronomical positioning before selection,and the data variance and standard deviation are 1 to 3 orders of magnitude lower.

关 键 词：捷联惯导 星敏感器 天文定位 物像共轭 精度评价 

分 类 号：V448[航空宇航科学与技术—飞行器设计]