Accession Number:

AD0367881

Title:

HUMAN FACTOR PROBLEMS IN ANTI-SUBMARINE WARFARE. DOPPLER DISCRIMINATION IN RELATION TO ECHO DURATION AND DISPLAY FREQUENCY

Descriptive Note:

Technical rept.

Corporate Author:

HUMAN FACTORS RESEARCH INC SANTA BARBARA CA

Report Date:

1965-10-01

Pagination or Media Count:

33.0

Abstract:

An experiment was conducted to determine the effects of speed translating recorded sonar signals on accuracy of doppler recognition. Both double-speeding and half-speeding were investigated. In addition, performance differences attributable to differences in basic display frequency were investigated. It was found that doppler recognition was slightly but systematically better when displayed at a central frequency of 500 cps rather than the 800 cps typically used in shipboard systems. Double-speeding the playback of a recorded signal benefited doppler recognition for echo durations from 40 to 100 ms provided the speeded signal was heterodyned back to a desirable display frequency. Half-speeding was found to produce adverse effects on doppler recognition at all echo durations investigated 40 to 220 ms.

Subject Categories:

  • Acoustic Detection and Detectors
  • Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE