System for undersea digital acoustic communications

US7310286B1 · kind B1 · utility

Assignee

• The United States of America, represented by the Secretary of the Navy · US

Inventors

• Susan M. Jarvis · Westport, US
• Fletcher A. Blackmon · Forestdale, US
• Ronald R. Morrissey · Randolph, US
• Nixon A. Pendergrass · Nashville, US
• Dean J. Smith · Dover-Foxcroft, US
• Kevin C. Fitzpatrick · Suwanee, US

Key dates

• Filing date: Jul 11, 2005
• Grant date: Dec 18, 2007
• Expiry date: Jan 12, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B13/02
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An undersea communications system in which a message is converted to a redundant fixed-length data packet and transmitted acoustically as a quadrature phase-keyed signal in a frequency band with a continuous pilot signal at a frequency closely adjacent to the frequency band. A receiver uses the received continuous pilot signal to Doppler compensate the incoming quadrature phase keyed signal by estimating any Doppler distortion in the received pilot signal. The resultant redundant signals are then robustly processed coherently and jointly by the adaptive decision feedback equalizer and decoder to provide the original transmitted data.