Doppler Rate-of-Change Estimation Method for BPSK Signal Based on Spectrum Phase

When there is relative motion between the receiver and the emitting source, the emitter position can be determined by a single receiver with a single channel using Doppler rate-of-change received. In this passive localization application, accurate Doppler rate-of-change information is the key precondition to guarantee high localization precision. A new Doppler rate-of-change estimation method for BPSK signal based on spectrum phase is proposed in this paper using the special structure of the continuous signal by BPSK (Binary Phase Shift Keying) modulation. In the proposed method, the phase jump can be eliminated by the squaring operation to the received signal, and the signal is segmented to multiple shorter pieces of the same length. The central frequency is estimated from each signal piece by fast Fourier transformation. The spectrum phase can be obtained by doing Fourier transform at the central frequency of each signal piece. The Doppler rate-of-change was estimated using the linear minimum mean square criterion. The effectiveness of the proposed method was proved by the computer simulation.