Passive Locating Method Using Phase Difference Rate Algorithm Based on Least Squares Fitting

The rate of phase difference change is an important index of passive location measurement. In the actual situation, the rate of phase difference change is not large, and the phase difference will not change much in a short time. In this paper, a phase difference rate measurement algorithm based on least squares fitting is proposed. On the basis of phase discrimination in frequency domain, this paper effectively solves the jitter problem of phase difference measurement caused by phase difference ambiguity through phase shifts twice, and then obtains the phase difference change rate of the signal by least-squares fitting. Theoretical and simulation experiments show that the accuracy can be achieved in a short time, and the positioning requirements can be met.