Accession Number:

AD0639384

Title:

THE RELATIVE EFFICIENCY OF A BEARING COUNTER AND BEARING DIAL FOR USE WITH PPI PRESENTATIONS.

Descriptive Note:

Memorandum rept.

Corporate Author:

SYSTEMS RESEARCH FIELD LAB JOHNS HOPKINS UNIV JAMESTOWN R I

Personal Author(s):

Report Date:

1947-08-01

Pagination or Media Count:

23.0

Abstract:

A direct-reading bearing counter was constructed and mounted on a VJ remote radar indicator so that this method of exhibiting the bearing of targets could be compared with that of the bearing dial normally used for the purpose. An experimental placement of the range counters, above the PPI and directly to the right of the bearing counter, was also tested. The first experiment measured the speed and accuracy with which radar operators can locate a target appearing on the PPI, adjust the bearing cursor and movable range rings to the position of the target, and read the bearing and range of the target from each of four different combinations of the bearing counter, bearing dial, and two range counters. The results show that, on the average, an operator can perform this sequence of operations 1.7 seconds 13.3 per cent faster per target when he reads bearings from the counter rather than from the dial. The second experiment compared the bearing counter and dial in terms of the speed with which settings could be reproduced on the two types of indicators. The bearing dial proved to be superior to the counter for this type of operation. These experiments indicate that a direct-reading counter is more efficient than an annular scale for presenting bearing information which must be read from an instrument. The counter-type indicator, however, is less efficient if settings must be reproduced or set into the equipment. Author

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE