Multiple Targets Passive Localization Technology Based on a Tolerant High Resolution Algorithm

Abstract

The underwater target’s bearing resolution capability of conventional beam forming method is strictly limited by Rayleigh limit and influenced by media’s inhomogeneity heavily. Minimum variance distortionless response (MVDR) algorithms have broken through the Rayleigh limit restrictions and make higher resolutions possible. For the complexity of the marine environment and multi-path affection, time reversal mirror (TRM) is a new technology which can self-adaptively correct distortion caused by variety of multi-path effects. The concept of TR-MVDR based on vertical array is introduced and the high resolutions of TR-MVDR are studied theoretically, which can realize the focus on original position of multiple objectives with higher spatial resolution and focus gain than conventional methods. Due to the poor robustness of TR-MVDR, robustness algorithm based on fixed diagonal loading and RCB have been studied, which can improve the robustness of high-resolution location. Simulations and experiments in freshwater and the sea proved it is feasible and practical