Analyses of 1963 LORAD Detection Tests in the Hawaiian Area.
Rept. for 29 Apr-17 Jun 63,
NAVY ELECTRONICS LAB SAN DIEGO CALIF
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Semi-operational testing of the LORAD system, conducted in the Hawaiian Area from 29 April to 17 June 1963, were designed to demonstrate the effectiveness of LORAD for ASW, with both conventional and high performance submarines as targets. The computer detection program used to perform the analysis reported here and which was also used as the on-line computer program during these tests is discussed. LORAD an acronym for Long Range Active Detection is a program to develop an active sonar system for the detection of submarines in deep water at ranges of 100 miles, and shallow water at ranges to 30 miles. Ranges up to 100 miles are achieved through the use of convergence Zone phenomena. In shallow water, ranges to 30 miles are achieved by surface duct transmission. Lorad uses a pseudo-random noise correlation scheme in which a deltic heterodyne correlator time compresses and correlates the incoming echoes with a stored reference of the transmitted noise sequence.
- Undersea and Antisubmarine Warfare
- Acoustic Detection and Detectors