该文从时延估计的Fisher矩阵的最基本概率表达式入手,利用Toerlitz矩阵性质,对无源定位中时延、多普勒及其更高阶导数联合估计的Fisher矩阵的性质进行分析.其结果表明由离散的时域采样信号进行的时延与多普勒估计是不耦合的,而且并不需要文献[1,4]引入的观测时间远大于信号相关时间的约束条件.“,”In this paper, started with the most elementary probability formula of Fisher matrix for time delay estimation, some properties of the Fisher matrix for time delay, Doppler shift and its hither derivatives joint estimation are exploited by use of Toeplitz matrix chracteristics in passive location systems. The results shows that the time delay and Doppler shift estimations by discrete time-domain samples are uncoupled without the constrained condition that the observation time is much greater than the radiating signal correlation time required in[1],[4].