Accession Number : ADA307755

Title :   Use of the NSWCDD Weather Databases for Prediction of Atmospheric Transmission in Common Thermal Imaging Sensor Bands.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

Personal Author(s) : Austin, Daniel E. ; Hepfer, Kenneth C. ; Rudzinsky, Marilyn R.

PDF Url : ADA307755

Report Date : OCT 1995

Pagination or Media Count : 34

Abstract : An important factor in calculating performance ranges for thermal imaging sensors (TIS) is the atmospheric transmission. The infrared energy from a target must first pass through a section of the atmosphere before reaching the TIS aperture. This atmosphere will attenuate the signal. The amount of attenuation depends on the sensor band and weather conditions, and may have a considerable affect on the strength of the received signal. Usually a complex program such as LOWTRAN 7 is used to calculate the atmospheric transmission for a given range and set of weather conditions, but this can be time consuming and involves the specification of many variables. In an attempt to simplify this process, weather information previously combined into databases was processed into a form that would allow simple estimates of TIS band atmospheric transmission at any given range at various levels of probability of occurrence. Three of these databases, the Random 400 (R400), the Random 384 (R384), and the Random 10,000 (R10K), represent a worldwide sample of a larger collection of weather data, known as the Naval Surface Warfare Center, Dahlgren Division Environmental database. A fourth database, the Persian Gulf 720 (PG720) describes only one specific location. This report describes these databases and the TIS band transmission modeling that was performed using them.

Descriptors :   *INFRARED IMAGES, *ATMOSPHERIC ATTENUATION, DATA BASES, WEATHER, PREDICTIONS, METEOROLOGICAL DATA, ESTIMATES, TRANSMITTANCE, DATA ACQUISITION, INFRARED RADIATION, HEAT.

Subject Categories : Infrared Detection and Detectors
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE