摘要
针对多站时差频差联合定位系统,建立了定位模型,推导了定位误差表达式并作了仿真分析。仿真结果表明,在观测站构型较差的情况下,多站时差频差联合定位与纯时差或频差定位相比可提高定位精度。本文同时提出了利用相参脉冲串实现雷达信号高精度频差测量方法,推导了无模糊频率估计的充要条件及相参脉冲串测频的CRLB,仿真及实验室测试结果证明了在一定条件下可实现对相参雷达信号的H z级测量精度,对工程应用具有一定的价值。
The algorithm model of the joint-positioning based on time difference of arrival（TDOA） and frequency difference of arrival（FDOA） is established for the multi-station position systems,and formulas for estimating the uncertainties in the emitter location are derived.By simulation,it is demonstrated that the combined TDOA/FDOA technique outperforms its TDOA-only or FDOA-only counterparts,even in the case of poor collector-target geometry.An approach for providing highly accurate FDOA estimates of the coherent radar pulse train is proposed.Both the iff（necessary and sufficient） conditions for unambiguous frequency estimation and the Cramér-Rao lower bound（CRLB） are presented.Simulation and lab testing results show that under certain conditions,the proposed method for the frequency estimation of the coherent pulse train can provide an accuracy on the order of several hertz.Thus,it provides the possibility for engineering application.
出处
《数据采集与处理》
CSCD
北大核心
2010年第3期307-312,共6页
Journal of Data Acquisition and Processing
关键词
无源定位
时差
多普勒频差
CRAMER-RAO下界
passive location
time difference of arrival
differential Doppler
Cramér-Rao lower bound
