On the basis of the function relationship between phase shift and Doppler shift, the Doppler shift expressions only based on time difference measuring can be derived by the measurement equality for path length difference obtained from phase difference location equation and time difference location equation. The passive ranging formula based on Doppler shift measurement derived from Doppler equation can be transformed into one only based on time difference measurement. The error analysis shows that the passive ranging formula based on time difference measurement on motion platform has better measurement accuracy as compared to the ranging method based on Doppler shift measurement. As long as the moving distance of platform is larger than some kilometers, the technical requirement that relative ranging error is less than 5%R can be realized.%在相移与频移之间函数关系的基础上，利用相差与时差定位方程对路程差测量的相等性导出了基于时差测量的多普勒频移表示式，由此即可将从多普勒方程中所导出的基于多普勒频移测量的运动单站无源测距公式转化为仅基于时差测量的运动单站无源测距公式。误差分析表明，和基于频移的测距方法相比，基于时差测量的运动单站无源测距方法呈现出较好的测量精度，只要平台的移动距离大于数千米，即可实现相对测距误差小于5%R的技术要求。
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