REVERBERATION CHARACTERISTICS IN THE DISCRIMINATION OF DOPPLER.
NAVAL PERSONNEL RESEARCH ACTIVITY SAN DIEGO CALIF
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The purposes of the study were to 1 Examine the effect on Doppler discrimination of training personnel with materials which eliminate the initial part of the reverberation pattern and, thereby, direct the operators attention to reverberations in the immediate vicinity of the echo, and 2 investigate whether or not Doppler discrimination is more accurate when operators attend to the contiguous portion of the reverberation which follows, rather than precedes, the sonar echo. It was found that subjects trained on long-duration reverberations tended to perform somewhat better than subjects trained on short-duration reverberations. It was also found that operators trained to compare an echo with reverberations which followed the echo were less accurate in Doppler discrimination than operators trained to compare an echo with reverberations which preceded the echo. Performance on an achievement test given after training tended to confirm the results during training. Author
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