Literature Available On Sperry's New Deepwater Navigation System

Sperry Corporation has announced the development of a high accuracy, deepwater integrated navigation system for use aboard seismic exploration vessels, and is now offering this system to potential users of such equipment.

Free literature is now available from Sperry completely describing the new system in detail.

A major advance in the Sperry system is a dead reckoning subsystem which uses a Sperry-developed parametric array doppler sonar. This sonar is capable of obtaining ship speed over the ocean bottom in depths of up to 6,000 feet. The subsystem also uses dual Sperry high accuracy MK 29 Mod 1 gyrocompasses with velocity outputs.

In addition to the dead reckoning subsystem, the integrated navigation system includes two Loran receivers and data processing capabilities for selected radio navigation aids. Extremely sophisticated data and signal processing techniques, including the u&e of five Kalman filters, are used in the system to reduce navigational errors.

All data processing for the system is performed by a 32-bit computer with a five megabyte disc memory. The computer program uses 152,000 words of memory. In addition to navigation information, the system provides guidance to the ship's crew for optimum approaches to designated survey lines, and provides input to the ship control system to permit the ship to remain on survey lines. Data logging on two magnetic tape drives is also provided. The system is controlled from any of four CRT terminals.

Among the key features of the ship's navigation system is the use of two Sperry CAS II collision avoidance systems which have been specially modified to display the position of the seismic streamer.

For free copies of the literature on this new navigation system, Circle 82 on Reader Service Card

Maritime Reporter Magazine, page 14, Nov 1984

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.