Interference patterns and source localization in the shadow zone of deep water
Passive sonar usually has a low signal-to-noise ratio(SNR)when detecting the radiated noise from a surface ship in the shadow zone of deep water,resulting in poor performance of passive localization methods.In order to solve this problem,a joint estimation method of the source range and the radial velocity based on the interference structure in the received spectrogram is proposed.The relationship between the periods of interference fringes along the frequency axis and the time axis in the spectrogram and the distance as well as the radial velocity of the source is first established.These interference periods are then estimated by applying two-dimensional Fourier transform(2-D FT)and multiband processing to the received spectrogram.The source range and the radial velocity are finally calculated.The simulations and the sea experimental results show that the proposed localization method using 2-D FT of the spectrogram has better robustness than the existing range estimation method based on the autocorrelation of the received signal.Therefore,it is more suitable for passive source localization under low SNR conditions.
Deep waterAcoustic shadow zoneInterference patternsSource range and radial velocityTwo-dimensional Fourier transform
NETL
NSTL
万方数据
维普
