| 引用本文: | 刘逸康,任顺清,张高雄,张祎.星敏与磁力仪间安装矩阵的一种地面标定方法[J].哈尔滨工业大学学报,2021,53(6):34.DOI:10.11918/201911009 |
| LIU Yikang,REN Shunqing,ZHANG Gaoxiong,ZHANG Yi.A calibration method for installation matrix between star sensor and magnetometer on the ground[J].Journal of Harbin Institute of Technology,2021,53(6):34.DOI:10.11918/201911009 |
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| 摘要: |
| 为了在地面准确标定卫星地磁测量系统中的磁力仪与星敏感器间的安装矩阵,设计了基于单轴无磁转台的标定系统,该系统由无磁转台、地磁场监测设备等组成.首先分析了系统中的误差源,建立了相应的坐标系进行误差传递,结合磁力仪的误差模型得到磁力仪的输出方程.据此提出了一种利用单轴立式无磁转台标定安装矩阵的方法.该方法采用谐波分析法辨识出磁力仪的输出方程中各误差系数,并得到了初始位置下磁力仪坐标系在地理坐标系下的姿态,通过星敏感器观星确定星敏感器坐标系在惯性空间的姿态,并根据当地经纬度与格林尼治恒星时,得出了初始位置下星敏感器坐标系在地理坐标系的姿态. 最后以地理坐标系为桥梁,解算出了磁力仪与星敏感器之间的安装矩阵. 结合Monte Carlo方法和不确定度合成公式对该方法进行仿真试验与误差分析,研究结果表明,在磁力仪观测误差为1 nT,星敏感器测量精度为1”下的安装矩阵各个元素不确定度在1.14×10-5 rad以内,验证了标定方法的正确性. |
| 关键词: 星敏感器 磁力仪 安装矩阵 误差模型 标定 |
| DOI：10.11918/201911009 |
| 分类号:TH762 |
| 文献标识码:A |
| 基金项目:装备“十三五”预先研究项目(4141708031) |
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| A calibration method for installation matrix between star sensor and magnetometer on the ground |
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LIU Yikang1,REN Shunqing1,ZHANG Gaoxiong2,ZHANG Yi2
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(1.Space Control and Inertial Technology Research Center, Harbin Institute of Technology, Harbin 150080, China; 2.Shanghai Institute of Satellite Engineering, Shanghai 200240, China)
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| Abstract: |
| To accurately measure the installation matrix between magnetometers and star sensors in satellite geomagnetic measurement system on the ground, a calibration system based on the single axis non-magnetic turntable was designed, which is composed of non-magnetic turntable, geomagnetic field monitoring equipment, etc. First, the error sources in the system were analyzed, and the corresponding coordinate systems were established for transferring the errors. The indicated output of the magnetometer was obtained by combining the error model of the magnetometer with the geomagnetic field. Thus, a method of calibrating installation matrix by using single axis vertical non-magnetic turntable was proposed. In this method, the error coefficients in the indicated output of the magnetometer were obtained by harmonic analysis, and the attitude of the magnetometer coordinate system in the initial geographical coordinate system was derived. The attitude of the star sensor coordinate system in the inertial space was determined by star sensor observation, and that in the initial geographical coordinate system was obtained according to the local longitude and latitude and Greenwich Sidereal Time. Finally, the installation matrix among the magnetometers and the star sensors was solved by using the geographic coordinate system as a bridge. Based on the Monte Carlo method and uncertainty synthesis formulae, simulation experiment and error analysis were conducted on the proposed method. Results show that the uncertainty of each element of the installation matrix was within 1.14×10-5 rad when the observation error of the magnetometer was 1 nT and the measurement accuracy of the star sensor was 1″, indicating the correctness of the calibration method. |
| Key words: star sensor magnetometer installation matrix error model calibration |
