摘要
低轨单星对自由段弹道的估计是天基预警系统需解决的关键技术之一。建立了低轨预警卫星对自由段弹道的观测模型,针对极大似然估计批处理算法的大运算量问题,给出了一种多项式逼近算法,由观测数据的逼近多项式在一些特定采样点的值形成伪观测数据,以伪观测数据代替原观测数据进行弹道估计。仿真表明,精度与极大似然估计相当,运算量显著降低。
The free-fight trajectory estimation by a single LEO satellite plays a key role in the space-based early warning system. An actual measurement function was established, and a polynomial approximation algorithm was proposed to reduce the computational amount of the batch algorithm of maximum-likellhood estimation （MLE）. The approximate polynomial of the measurement function was evaluated at some deterministic instants to form pseudo measurement data. The raw measurement data were replaced by the pseudo ones to estimate the trajectory. The simulation results show that this new algorithm greatly reduces the computational amount, and can achieve the same accuracy performance as MLE.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2011年第4期48-50,共3页
Journal of National University of Defense Technology
基金
国家自然科学基金资助项目(60974124)
关键词
低轨预警卫星
弹道估计
多项式逼近
LEO early warning satellite
trajectory estimation
polynomial approximation
