側掃聲納模擬平台之建置

Abstract

本文探討側掃聲納訊號之模擬技術，藉由聲波在海水中之傳播將聲能傳達到目標物，接著經由目標物的反射與散射，再將部分聲能，經由反向路經傳回聲能接收器，並考慮拖魚本身的運動特性，最後在經由信號處理方式，轉換成聲納圖像，達到側掃聲納訊號模擬的目的。模擬過程中，利用碎形原理產生海床，其地形為一種隨機碎形地形，而利用雙站散射模型獲得目標物之反射訊號。本文主要貢獻為結合聲音在水中傳播特性、反射模型與拖魚運動特性，產生側掃聲納之模擬訊號。

This work presents the development of a side-scan sonar images simulator by considering the image formation processes of a side-scan sonar acoustic model and properties of terrain. The simulator involved acoustic propagation through the water medium, seabed scattering and towfish motion characteristics. Synthetic images are obtained by applying the bistatic scattering model. The seabed is generated using the fractal theory and the terrain is represented as a random fractal terrain. The outcome of the simulator has two aspects: the synthetic side-scan sonar signal and synthetic side-scan images. The simulator can be used as a tool to generate simulated side-scan signals for underwater exploration tasks.