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多校准站TDOA/FDOA无源定位方法
禹华钢,汪汇川
0
(解放军91469部队,北京 100841;解放军92232部队,北京 100161)
摘要:
针对运动目标到达时差(Time Difference-of-Arrival,TDOA)/到达频差(Frequency Difference-of-Arrival,FDOA)定位中的接收站定位误差问题,提出了基于多校准站的TDOA/FDOA定位方法,有效降低接收站定位误差的影响,并推导了该方法的克拉美罗下限(Cramér-Rao Lower Bound,CRLB)。理论分析表明,采用多校准站法能有效降低CRLB,提高目标定位精度。同时,当校准站自身定位存在误差时,也将影响对接收站的校准和目标的定位精度。通过仿真实验定量分析了采用多校准站法对定位精度的改善程度。
关键词:  目标定位  无源定位  多校准站  克拉美罗下限  到达时差  到达频差
DOI:
基金项目:国家高技术研究发展计划(“863”计划)项目(2014AA7014061)
A TDOA and FDOA source passive localization method using calibration emitters
YU Huagang,WANG Huichuan
(Unit 91469 of PLA,Beijing 100841,China;Unit 92232 of PLA,Beijing 100841,China)
Abstract:
According to the problem of moving source location using the time difference-of-arrival(TDOA) and frequency difference-of-arrival(FDOA) measurements in the presence of sensor location uncertainties,calibration emitters are used to reduce the influence of sensor location errors and improve source localization accuracy.The Cramér-Rao lower bound(CRLB) of TDOA and FDOA source location using calibration emitters is derived.The results of theoretical analysis show that,the use of calibration emitters is able to effectively decrease the source location CRLB and improve source localization accuracy when receiver locations are not accurate,and when there exist calibration location errors,the improvement of source localization accuracy by using calibration emitters will be decreased.The improvement degree of source location accuracy by calibration emitters is quantitatively analyzed through simulation experiments.
Key words:  source localization  passive localization  multiple calibration  Cramér-Rao lower bound(CRLB)  time difference-of-arrival(TDOA)  frequency difference-of-arrival(FDOA)
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