摘要
针对基于星座对地面辐射源的无源定位问题,研究了三星多普勒频差定位方法。建立了精确的定位数学模型,在此基础上推导了定位方程组的迭代求解方法,分析了定位模糊问题。在充分考虑各种随机观测误差的条件下,得到了定位误差几何稀释因子(GDOP)的理论表达式,并通过Monte-Carlo仿真验证了正确性。分析表明,多普勒频差测量误差和卫星速度测量误差是影响定位精度的主要因素,并且定位精度高的区域分布主要与卫星飞行方向有关。
To solve the problem of locating a ground emitter from a constellation,a Doppler frequency difference-based three-satellite passive location method is studied. On the basis of an accurate location model,an iterative algorithm is derived to solve the location equations and the problem of location ambiguity is analyzed. The geometric dilution of precision （GDOP） is theoretically analyzed and verified by Monte-Carlo simulations. The analysis results show that the measurement errors of Doppler frequency difference and satellite velocity have large effects on the location error,and the area with high location accuracy is mainly related to satellite flying direction.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2010年第7期1832-1837,共6页
Journal of Astronautics
关键词
无源定位
卫星
多普勒频差
Passive location
Satellite
Doppler frequency difference
Location accuracy
