Accession Number : ADA189336

Title :   Pursuit Tracking Performance Decrements Associated with Decreasing Ambient Illumination.

Descriptive Note : Final rept. Feb-Jul 87,

Corporate Author : LETTERMAN ARMY INST OF RESEARCH PRESIDIO OF SAN FRANCISCO CA

Personal Author(s) : Molchany, Jerome W ; Stamper, David A ; Lund, David J

PDF Url : ADA189336

Report Date : Aug 1987

Pagination or Media Count : 30

Abstract : Reduction in ambient illumination alters one's ability to acquire and track moving targets. In this study we have attempted to describe the relationship between decreasing ambient illumination and pursuit tracking performance. Eight male volunteers used an optical tracking device to track targets at a constant angular velocity of 5 mrad/sec under bright and reduced ambient light levels was accomplished by inserting neutral density filters into the optics of the tracking device. Volunteers were assigned randomly to a schedule of 6 reduced ambient illumination. Analysis of Variance for the Percent Time-on-Target (%TOT), horizontal Root Mean Square (RMS) error, and Maximum Absolute Error (MAE) revealed highly significant main effects. Ambient light levels below 0.075 cd/sq.m. produced large tracking error scores (e.g., %TOT 68%). The use of direct view optics below luminance levels of 0.18 cd/sq.m. could seriously jeopardize the success of the mission. Keywords: Pursuit tracking; Humans; Decreasing ambient illumination.

Descriptors :   *ANGULAR MOTION, *HUMANS, *MOVING TARGETS, *OPTICAL TRACKING, *PURSUIT COURSES, *TRACKING, CONSTANTS, DEGRADATION, DENSITY, ERRORS, FILTERS, HORIZONTAL ORIENTATION, ILLUMINATION, LUMINANCE, MALES, MEAN, NEUTRAL, OPTICAL EQUIPMENT, OPTICS, SCORING, TARGETS, VOLUNTEERS

Subject Categories : Optical Detection and Detectors
      Target Direction, Range and Position Finding
      Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE