Abstract
Bayesian methodology is a good way to infer unknown parameters in a marine environment. A passive source location method in a shallow water waveguide with a single sensor based on Bayesian theory is presented in this paper. The input of a Bayesian inversion algorithm is received different normal mode impulse signals, which are separated and extracted with a warping transformation from received broadband impulse signals. The source range, depth, and other seabed parameters were estimated without prior knowledge of the seabed information. Different normal mode impulse acoustic signals travelling at different group speeds arrived at the sensor at different times because of the dispersion characteristics of the shallow water waveguide. The time delay of different modes can be used for the passive source location. However, normal mode group speeds are greatly affected by the environmental parameters. The performance of the passive location becomes negative when parameters mismatch. In this paper, the source location was transformed to the inversion of the source location and environmental parameters, which can be estimated accurately based on the multi-dimensional posterior probability density (PPD). This method is less limited by environmental factors, and the accuracy of inversion results can be analyzed according to the PPD of inversion parameters, which has higher reliability and a wider application scope. The effectiveness and robustness of the algorithm were quantified in terms of the root mean squared error (RMSE) at a variety of signal-to-noise ratios (SNRs) in 50 simulation sets. The RMSE values decreased with the SNR. The validity and accuracy of the method were proved by the results of simulation and experiment data.
Highlights
The passive location of underwater sources is the basis of underwater target detection and is an active field in underwater acoustic research
Based on the number of sensors, passive source location technology in a shallow water waveguide can be divided into two categories: methods using a sensor array and those with a single sensor
The depth was 25 m, the sound speed in water was an isovelocity with c0 = 1500 m/s, a broadband source was emitted at depth zs = 20 m with frequency band 200~300 Hz, the source is a linear frequency modulated impulse signal, the signal-to-noise ratios (SNRs) was 20 dB, and the signal was received at depth zr = 23 m after propagation range r = 7700 m
Summary
Xiaoman Li 1,2,3 , Shengchun Piao 1,2,3, *, Minghui Zhang 1,2,3 and Yan Liu 1,2,3. Key Laboratory of Marine Information Acquisition and Security, Harbin Engineering University, Ministry of Industry and Information Technology, Harbin 150001, China.
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