Analysis of the Feasibility of the Array Invariant-based Source Range Estimation in Deep Sea by Vertical Linear Array

Abstract

The array invariant based on conventional beamforming has been proposed for source-range estimation using a horizontal linear array (HLA) or vertical linear array (VLA), with no need for forward model computations. The approach has been demonstrated successfully with experimental data in shallow water. However, it is rarely reported in the deep sea. In this paper, the generalized array invariant is extended to deep-sea environment where the waveguide invariant is variable in range. The method of source localization in deep sea based on array invariant using a VLA has been studied. The feasibility of the array invariant-based source range estimation in deep sea by vertical array is verified by simulation with different source-receiver ranges (3km, 5km, 8km and 12km) in 2000 m water depth. The simulation results show that the method can be effectively applied to deep-sea localization, and the relative error is less than 15%. This method can provide reference for the research of deep-sea localization and deep-sea target recognition.