双星定位系统中目标移动性检测与仿真  

Motion Detection and Simulation in Dual-Satellite Geolocation System

作　　者：魏合文[1] 夏畅雄[2] 叶尚福[2] 

机构地区：[1]电子科技大学,四川成都610054 [2]西南电子电信技术研究所,四川成都610041

出　　处：《系统仿真学报》2007年第11期2543-2546,2573,共5页Journal of System Simulation

摘　　要：双星定位系统通过测量两颗相邻卫星相对于地球表面静止辐射源的时差/频差(TDOA/FDOA)来实现定位功能。但是,地面辐射源的移动性影响FDOA,导致该系统定位误差急剧增大。为了检测辐射源的移动性,提出了两种基于时差/频差测量的目标移动性检测算法,即拟合度检验和Rao检验,两者均只需要估计静止假设下目标的位置。比较了两者的检测性能,仿真与分析验证了检测算法的有效性。Dual-satellite geolocation system can locate a stationary emitter on Earth by using time and frequency differences of arrival （TDOA/FDOA）. However, emitter motion will cause a bias on the FDOA, resulting in calculated positions with unacceptable errors. If motion is detected, the position is known to be inaccurate. Two algorithms for motion detection based on TDOA/FDOA measurements were proposed by using fit test and Rao test which just need the position estimation of stationary hypothesis. The performances were analyzed and compared, and the availability was verified by the simulation results.

关 键 词：双星定位 拟合度检验 Rao检验 时差(TDOA) 频差(FDOA) 

分 类 号：TN911.72[电子电信—通信与信息系统]