STUDIES OF DOPPLER RECOGNITION USING THE SQS-23 SONAR
HUMAN FACTORS RESEARCH INC LOS ANGELES CA
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Three studies of doppler discrimination were con ducted using a test composed of 62 sea-recorded sequences of echoes from submarine targets. The echoes were recorded at the standard display frequency of approximately 800 cps, and, for the purposes of one of the three studies, were heterodyned to six experimental display frequencies ranging from 400 to 1000 cps. The sub marine target operated at depths of 50 - 300 feet and at speeds of 3 and 6 knots. The amount of doppler in cps for each of the 62 sequences was computed from the target angle, the speed of the submarine, and the transmission frequency of the sonar.
- Military Operations, Strategy and Tactics
- Undersea and Antisubmarine Warfare
- Acoustic Detection and Detectors
- Active and Passive Radar Detection and Equipment