Geometric Approach to Passive Ranging in Underwater Localization Systems
|關鍵字:||水下聲學;被動聲納定位;純方位動態目標分析;underwater acoustics;passive sonar localization;bearings-only target motion analysis|
The use of underwater surveillance system has become a critical means of effectively realizing command of the maritime power. Ships or submarines equipped with active sonar systems need to make sounds to obtain range or angle information. Unfortunately, local security issue occurs in the situation. To meet the security consideration of local information, passive tracking or localization techniques, the so-called bearings-only target motion analysis (BO-TMA) was developed along with the given direction of arrival (DOA) estimation. In this thesis, we propose a new geometric approach and derive a closed-form solution which can be implemented in BO-TMA algorithms. In order to take realistic environments into account, an undersea non-Gaussian noise is further introduced and an improvement of the proposed method was also developed to address the situation. Finally, analysis and simulation results showed that the proposed scheme can achieve good performance and can be used in a short time period. The proposed algorithm can then be performed by trackers to generate the initiation information and hence reduce the bias.