Multipath time-delay estimation based on homomorphic filtering in logarithm domain

Aiming at solving the problem of multipath time-delay estimation for narrow-band signal in underwater acoustic channel, this paper studied the cepstrum method and proposed a time-delay estimation algorithm based on logarithm domain homomorphic filtering. With the thoughts of spectrum and homomorphic filtering, the received signal is turned into logarithm domain and then subtracted by the stored signal. After the residual signal and noise is filtered, the signal is turned back into the time domain to get the multipath time-delay estimation. Compared with the conventional method filtering/correlation and cestrum methods, this algorithm has advantages in time-delay estimation precision and noise suppression capability. The validity of the proposed method is verified with simulation results and processed lake trial data.