Underwater target parameter estimation using temporal symmetric Doppler sensitive signal

Based on the fact that the temporal symmetric signal remains symmetric after being reflected by a uniformly moving target and the velocity sensitivity of the Doppler sensitive signal, a moving target parameter estimation method using the temporal symmetric Doppler sensitive signal is proposed. By transmitting the temporal symmetric Doppler-sensitive signal, the velocity sensitivity of the signal is utilized to separate the moving target echo from reverberation. Frequency-domain filtering is then applied to suppress reverberation in the received data. The filtered received data are then cross-correlated with their time-flipped versions to estimate the time delay of the moving target echo. Finally, the data segment containing the target echo is extracted for velocity estimation using multiple matched filters. Simulation and experimental results demonstrate that this method significantly improves the computational speed of parameter estimation while suppressing reverberation.