Abstract
-One of the advantages of parametric array is its broadband ability at low frequency. Recently, parametric acoustic source is gradually being used in communication sonar and detection sonar in shallow water, and broadband signal design for parametric array is pressing in order to obtain high transmitting rate for digital signal communication and good performance for detection in shallow water where reverberation is usually severe. In this paper, Full wave simulation of the acoustic field of broadband parametric sonar is presented, and FDTD (finite-difference time-domain) method is used in producing the simulation. The suggested envelopes according to self-demodulation theory and physical parameters of a parametric sonar are introduced into the full wave simulation. An improved method of generating LFM (Linear Frequency Modulation) signal and a simple method of generating Ricker wavelet are proposed. And for digital signal transmitting, simulation results show that PAM (Pulse Amplitude Modulation) signal are better than BPSK (Binary Phase shift Keying) signal when used as the envelope of primary wave. Keywords-broadband parametric sonar; FDTD; selfdemodulation theory
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