摘要
因单星测向定位体制存在系统构成复杂、对卫星载荷和姿态要求高等问题,提出一种单个低轨卫星仅测脉冲到达时间(TOA)实现对地表静止辐射源无源定位的方法。在研究仅测脉冲TOA估计径向加速度的基础上,提出采用网格搜索法进行定位的方法。推导得到了该方法定位误差的克拉美-罗下限(CRLB)及对于不同位置辐射源的定位误差几何分布(GDOP),并分析了该方法的可实现性。理论和仿真分析表明,该方法实现简单,适用范围广,定位性能满足实际需求。
Due to the problems such as system complexity, heavy load demand and precise attitude demand of the single satellite passive localization using angles measurements, a method of locating the static emitter on the earth＇ s surface by a single low earth orbit satellite only using time of arrival （TOA） is proposed. Based on the researches of radial acceleration estimation from the TOA measurements only, this paper proposes the localization method using the grid search technique. The Cramer-Rao Lower Bound （CRLB） of localization error and the Geometric Dilution of Precision （GDOP） for different location on earth is derived. And the feasibility of this method is analyzed. Theoretical analysis and computer simulation indicate that this localization method is easy to implement and could be widely used. And the performance of this method could meet the application demand.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2010年第2期502-508,共7页
Journal of Astronautics
关键词
卫星
无源定位
到达时间
克拉美-罗下限
Satellite
Passive localization
Time of Arrival （TOA）
Cramer-Rao lower bound （CRLB）
