Sonar Doppler Discrimination in High Noise Environments
Abstract
The experiment was concerned with the ability of anti-submarine warfare helicopter-borne sonarmen to perform doppler discrimination in the high background noise existing aboard rotary winged aircraft. Performance on a frequency discrimination task was measured under conditions in which the background noise was varied in intensity up to levels approaching those found aboard helicopters. The level of the signal was also varied such that under some conditions the signal was only slightly audible above the noise while under some conditions the signals were clearly audible. It was found that the intensity of the noise was not, of itself, related to the acuity of frequency discrimination. Rather, the differences between the signal level and noise level was most directly related to pitch discrimination performance. It was concluded that, if the signal level could be maintained well above the background noise level, doppler discrimination would not be seriously impaired.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 10, 1971
- Accession Number
- AD0734118
Entities
People
- Martha Koch
- Paul F. Smith
Organizations
- Naval Submarine Medical Research Laboratory