针对利用多次时差测量的运动多站无源定位精度问题,依据最小均方误差无偏估计理论,推导出基于克拉美-罗界的多次时差理论定位精度,并分析了布站构型、时差测量和测量速率等因素对时差理论定位精度的影响。结果表明,通过合理布站、加快测量速率等手段可明显提高运动多站无源定位精度。理论分析与结论对确定运动多站定位系统技术指标和衡量定位系统性能具有实用价值。

The problem of position accuracy in moving multi-station passive location system was investigated based on TDOA. According to the theory of the least square error unbias estimate, a location precision method based on Cramer-Rao lower bound (CRLB) for multi-station TDOA location systems was deduced, and the factors including the multi-station configuration, the measure precision and the sampling speed, which affecting the location precision were also analyzed. It is concluded that a favourable configuration of receivers and faster measure velocity will improve the location precision. The theory analysis and simulation results are useful for confirming technique guide line in moving multi-station passive location system.