水下定位系統中被動測距之幾何法

Abstract

水下監控系統是現代國防中格外強調之制海權實現關鍵技術,由於安全性及 隱蔽性之考量,僅利用方位估測資訊的被動式追蹤及定位技術漸漸受到重視,即 是純方位目標動態分析。於本論文中,吾人提出一利用自身觀察物移動之幾何方 法及其閉合解求得目標所處位置,此機制能夠被應用於純方位目標動態分析之初 始狀態。另針對實際環境中水下雜訊之干擾,提出一批次性處理之被動定位系統, 由分析及電腦模擬結果顯示,吾人提出之演算法可提供良好的效能並且於短時間 內完成。

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.