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讨论了多普勒频率差定位技术的实现方法，推导了定位误差公式，并给出了实际使用时的简化而直观的形式，同时进行了数值模拟。
The realization of location using the difference of doppler frequency is discussed, the formula for the location error is derived and its simplification form with data simulation is presented.
由于外差或频差效应，能够得到多普勒频率。
The Doppler frequency can be obtained as a heterodyne or beat effect.
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