Abstract:One of the concerns for engineering and technical personnel is how to select a suitable multibeam bathymetry sonar to meet the operational requirement of unmanned equipment such as AUVs. This paper starts from the adaptability of multibeam bathymetric sonar system with unmanned systems, uses the active sonar equation in the reverberation background to establish a method for calculating and evaluating the operating range of multibeam bathymetric sonar at different operating frequencies, and calculates and compares the operating range of multi beam bathymetric sonar at 100kHz to 500kHz. On this basis, high-precision imaging simulation of multibeam bathymetry was conducted using linear frequency modulation signal, FFT beamforming, pulse compression, spline interpolation to expand target angle, and Rife algorithm to optimize angle estimation. The imaging characteristics and bathymetry resolution of multibeam bathymetry sonar were analyzed through linear terrain and stepped terrain. The main conclusions are as follows: (1) The proposed multibeam range evaluation method can be used to guide the selection of frequency parameters for multibeam sounding sonar used by unmanned equipment; (2) According to the simulation results of multi beam bathymetric sonar, it was found that multibeam bathymetric sonar has good imaging performance within an open angle of 140 degrees, rather than having a larger open angle of the beam; (3) The distance resolution of CW signal and linear frequency modulation signal was analyzed through simulation, which can be used to guide the height and signal parameter settings during multibeam bathymetry operations.
