摘要
如何利用辐射源信号到达不同卫星的多普勒频差对辐射源定位是目前卫星无源定位技术研究的热点之一。针对卫星FDOA辐射源定位的特点,建立含有地球表面约束的FDOA定位方程,研究基于最大似然网格搜索的定位方程求解算法,推导了详细求解过程,并对该算法的性能进行分析与仿真评估。仿真结果表明,该算法收敛速度快,能够接近克拉美罗界下限,是一种最优的定位估计器。
How to perform emitter positioning using FDOA between satellites is one of the most popular research areas of passive location with satellites. In this paper, in view of the characteristics of FDOA emitter positioning, the FDOA location equation is established, and the solutions of the FDOA location equation with earth constraint are deduced in detail based on maximum likelihood grid search.The simulation results show that this algorithm can achieve the CRLB and has a high convergence speed, and it is the optimal estimator.
出处
《无线电通信技术》
2014年第3期58-60,75,共4页
Radio Communications Technology
基金
国家自然科学基金资助项目(61032004
91338201)
国家高技术研究发展计划("863"计划)资助项目(2012AA121605
2012AA01A503
2012AA01A510)
关键词
到达频差
网格搜索
最大似然
克拉美罗下限
frequency difference of arrival
grid search
maximum likelihood
Cramer-Rao lower bound
