Underwater multi-source DOA tracking using uniform linear array based on improved GM-PHD filter

Abstract

Uniform linear array (ULA) is commonly used for collecting underwater acoustic signals, and the direction-of-arrival (DOA) is obtained by array signal processing methods. The ULA-based multi-source DOA tracking suffers from the performance degradation caused by the presence of false tracks from port-starboard ambiguity. To address this problem, we propose a bearing ambiguity discrimination algorithm. Firstly, the sum of real bearing motion velocity between truth and ambiguous targets is established with the Gaussian distribution. Secondly, an improved Gaussian mixture probability hypothesis density (GM-PHD) filter, which can adaptively generate target birth intensity, is utilized to select truth and ambiguous bearings generated by the same target from the estimated posterior intensity. Thirdly, truth and ambiguous bearings are discriminated according to the fact that the change of array heading will lead to a significant change in ambiguous bearing. Simulation and real experimental results illustrate that the proposed algorithm can provide unambiguous target-generated tracks and accurately estimate the number of targets.

Underwater wideband coherent signals DOA estimation using sparse representation and deconvolution

“…Underwater acoustic measurement techniques and array signal processing are closely concerned with the direction of arrival (DOA) [1]. To separate these sources, the problem is then turned to spatial filtering to estimate the direction of each source with the uniform line array (ULA) [2,3]. DOA estimation is a meaningful topic in array signal processing and it has been widely used in radar, sonar, seismic exploration, radio astronomy, and wireless communication [4][5][6][7][8].…”