双星TDOA/FDOA定位系统的目标定位精度分析  

Target Location Accuracy Analysis of Dual-satellites Location System Using TDOA and FDOA

作　　者：常新亚[1] 谢斌[1] 张晓敏[1] 兰丁[1] 

机构地区：[1]航天东方红卫星有限公司,北京100094

出　　处：《航天器工程》2013年第4期35-42,共8页Spacecraft Engineering

摘　　要：根据双星时差/频差(TDOA/FDOA)的定位原理,推导了目标定位精度模型,分析了目标定位精度与轨道高度、星间基线长度、TDOA测量精度、FDOA测量精度、卫星速度测量精度、卫星位置测量精度等误差源之间的关系。分析结果表明:测量因素中的FDOA测量精度和卫星速度测量精度,是影响双星定位的关键因素;而TDOA测量精度和卫星位置测量精度,对目标定位精度的影响较小。Based on the principle of TDOA/FDOA location,an accuracy model of target location is deduced. The relationships between accuracy of target location and error sources are discussed, such as orbit altitude, distance between two satellites, TDOA（time difference of arrival accura- cy）, FDOA（frequency difference of arrival accuracy）, measurement accuracy of velocity and sat- ellite position. It is shown that FDOA and measurement accuracy of velocity are the crucial fac- tors, and TDOA and measurement accuracy of satellite position are secondary.

关 键 词：双星定位 时差 频差 目标定位精度 误差源 

分 类 号：V443[航空宇航科学与技术—飞行器设计]