الفهرس | Only 14 pages are availabe for public view |
Abstract Acoustic (Hydroacoustic) position reference systems are used extensively within the Dynamic Positioning (DP) community. A clear understanding of the capabilities and limitations of these systems is required by all involved in the procurement, engineering and operation of DP vessels. The increase in the number ofDP vessels working in close proximity and the increased water depths are just two of the factors driving the development of acoustic positioning systems. There are existing commercial sources that provide acoustic positioning systems with varying levels of capability as a Dynamic Positioning (DP) position reference sensor (PRS). Systems are currently available to provide a position reference to 12,000 feet of seawater (fsw) or 3,700m with an absolute accuracy of 3-Sm and a relative accuracy of <2m. Also available from these and other sources are shorter range, higher resolution acoustic positioning systems. This Report discusses how these systems are configured and what capabilities they have. A definition of conventional systems and frequency bands is included. The Report also discusses the Long Baseline (LBL) acoustic positioning system in particular. A definition of Long Baseline system, method of operation and considerations required are included. |