Accession Number:

ADA270124

Title:

A Sensitivity Study of Daytime Visibility Determination with the Horizon Scanning Imager

Descriptive Note:

Scientific rept. no. 2

Corporate Author:

SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB

Report Date:

1991-07-01

Pagination or Media Count:

46.0

Abstract:

The Horizon Scanning Imager is an automated system for determination of visibility during the daytime. This is accomplished through evaluation of contrast transmission of the atmosphere, which is determined from the measured radiance of dark targets near the horizon. The determination of visibility during the daytime by the Horizon Scanning Imager is influenced by a number of parameters, some measured and others input by the operator. These include the measured target radiance, measured horizon radiance, and inherent contrast of the target with respect to the horizon. A sensitivity study, in which the impact of uncertainty in these parameters is determined, is included. On the basis of this study, specific recommendations are made to improve the visibility determinations. The first set of recommendations relates to the sensor accuracy and includes ways to improve the measurements and also ways to mitigate the impact of the residual errors. The second set of recommendations details strategies to minimize the impact of non-ideal measurement conditions.

Subject Categories:

  • Meteorology
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE