Accession Number:

AD0639375

Title:

Comparison of Manual and Standard Methods of Target Indication

Descriptive Note:

Memorandum rept.

Corporate Author:

JOHNS HOPKINS UNIV BALTIMORE MD PSYCHOLOGICAL LAB

Personal Author(s):

Report Date:

1947-02-01

Pagination or Media Count:

11.0

Abstract:

The experiment compares the efficiency of two methods of target- indication on a simulated search radar 1 the present method in which the operator estimates range and bearing with the aid of a bearing cursor and range marks, and makes a verbal report and 2 an experimental method in which the position of each target is indicated by the use of a pointing device in the hands of the operator. The manual method of indication proved equally accurate in indicating bearing, and more than twice as accurate in indicating range as the oral report of estimation. In speed of indication, the experimental method exceeded the present method more than three times. It was further shown that, using manual indication, no change in performance occurs as a result of increasing the number of targets to be indicated from 5 to 30. These findings lead to the conclusion that a system of target indication based upon pointing would give better results in terms of the performance of the operator at the search radar. An incidental result with important practical implications is that large 20 inch PPIs yielded no better accuracy or time score than smaller 7 inch PPIs, using the present estimation method of indication.

Subject Categories:

  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE