Accession Number : AD0480130

Title :   DOPPLER DISCRIMINATION AS A FUNCTION OF VARIATIONS IN DIMENSIONS OF THE SONAR ECHO.

Descriptive Note : Final rept.,

Corporate Author : NAVAL PERSONNEL RESEARCH ACTIVITY SAN DIEGO CA

Personal Author(s) : Lau, Alan W.

Report Date : FEB 1966

Pagination or Media Count : 40

Abstract : Subjects were drilled and tested on their ability to judge Doppler. The training and test materials consisted of synthetic echoes superimposed upon a sea-recorded reverberation pattern. The echoes were systematically varied with respect to Doppler, echo length, echo onset, and relative signal strength. The purposes of the study were to: (1) Identify the effects that variations in echo length, echo onset, and relative signal strength have upon the ability to discriminate Doppler correctly; (2) evaluate the effect that training has upon the improvement of Doppler discrimination; (3) examine whether or not transfer of training occurs when subjects are tested on sea-recorded materials. It was found that performance was significantly affected by training, and that drill on synthetic material appeared to reduce the amount of training time necessary for improved performance on sea-recorded material. Although Doppler discrimination was significantly affected by echo length and the relative intensity of the echo, the differential effect of different levels of these echo characteristics appeared to be largely the result of various perceptual or response biases toward no Doppler echoes. (Author)

Descriptors :   *ECHO RANGING), (*SCANNING SONAR, (*DOPPLER EFFECT, SCANNING SONAR), (*SONAR PERSONNEL, PERCEPTION(PSYCHOLOGY)), IDENTIFICATION SYSTEMS, SONAR SIGNALS, SYNTHESIS, DISPLAY SYSTEMS, ELECTROMAGNETIC PULSES, NOISE, ACHIEVEMENT TESTS, STUDENTS, ACOUSTIC SIGNALS.

Subject Categories : Personnel Management and Labor Relations

Distribution Statement : APPROVED FOR PUBLIC RELEASE