Under-the-Hull Diver Location System.
Abstract
A feasibility study of techniques for locating and tracking a diver under the hull of a ship being inspected. This study, the first step in a system to explore the technological alternatives for efficiently inspecting large hulls. After examining techniques for locating a swimming diver, acoustics is the overwhelming choice, although it is not without problems. Acoustic positioning errors caused by multipath effects and shadowing were investigated extensively using computer simulations to examine the severity and to evaluate effectiveness of possible corrections. Two system utilize the range-range technique for position measurement. One, the hardwired system, emphasizes simplicity of in-water components at the expense of multiple cable interconnections topside. The other, a wireless system, emphasizes simplicity of installation at the expense of greater complexity for the in-water components. Both systems have similar performance, sizes, and weights, but the wireless system version be developed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1984
- Accession Number
- ADA163410
Entities
People
- Clifford R. Holland
- George J. Moss Jr.
- Robert A. Brown