微小卫星姿态确定系统多信息融合滤波技术  

Multi-information Fusion Method of Micro Satellite Attitude Determination System

作　　者：郁丰[1] 刘建业[1] 熊智[1] 李丹[1] 

机构地区：[1]南京航空航天大学导航研究中心,南京210016

出　　处：《上海交通大学学报》2008年第5期831-835,共5页Journal of Shanghai Jiaotong University

摘　　要：采用微小卫星姿态动力学,并针对太阳敏感器/磁强计/卫星导航系统(GPS)接收机多姿态信息融合的特点,提出一种基于融合反馈模式的改进联邦滤波姿态确定方法,各子滤波器只完成量测更新,由主滤波器完成时间更新与预测信息的分配.给出了由四元数描述卫星姿态的误差状态方程和各子系统的量测方程,基于磁强计测量信息,对微小卫星的主要干扰源剩磁进行建模.仿真结果分析表明:基于剩磁建模的姿态动力学模型可有效提高姿态确定的精度;改进联邦滤波算法减少了系统的计算量,保证了可靠性.A new micro satellite attitude determination algorithm based on improved fusing-feedback federal filtering was presented in solution of multi-information fusion using micro satellite attitude dynamics, sun sensor, magnetormeter and GPS receiver. Only measurement renovating is processed by local filters, while time renovating and predicted information are done in main filter. The satellite attitude state error equation using quaternion and measurement equation of local filters were showed. Based on magnetometer measure ment information the remanence, which is the main disturbing source for microsatellite, was modeled. The simulation results indicate that the accuracy for attitude determination is improved by the attitude dynamics including remanence modeling, while the caculation efficiency is enhanced and the reliability is ensured by the improved federal filtering.

关 键 词：微小卫星 姿态确定 信息融合 联邦滤波 剩磁 

分 类 号：V848[航空宇航科学技术]