Accession Number : ADA194205

Title :   Evaluation of Atmospheric Effects for Operational Tactical Decision Aid.

Descriptive Note : Final rept. Jan-Aug 87,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Tomiyama, Ken

PDF Url : ADA194205

Report Date : 09 Feb 1988

Pagination or Media Count : 61

Abstract : The Tactical Decision Aid (TDA) is an integrated target/atmosphere/sensor model that is used to estimate target acquisition ranges for infrared sensors. It employs an extensive 8000-plus line computer code, LOWTRAN-6, to evaluate the atmospheric extinction of infrared signals for various climatological conditions. The Operational Tactical Decision Aid (OTDA) is a simplified version of the TDA housed on an HP-41CX, a hand-held computer, and is intended for field use. Since LOWTRAN-6 is too voluminous to be employed for the OTDA, precomputed extinction data tables are currently in use. Manual input of data from the tables to the OTDA is cumbersome and is prone to erroneous readings. Therefore, compact atmospheric extinction models were developed for various types of atmospheric extinction which are significant for the TDA application. The models were developed based on the LOWTRAN-6 computation and were verified through extensive accuracy analysis. For automated generation of a database for accuracy analysis, an interactive driver for LOWTRAN-6, called DGU, was developed. The program can create input decks for LOWTRAN-6 from interactive sessions, run LOWTRAN-6, and post process the LOWTRAN-6 generated data. Finally, the obtained models were integrated into a program, called CTRAN, and coded onto a VAX computer in FORTRAN and in Reverse Polish Notation for the HP-41CX. Keywords: LOWTRAN; Tactical decision aids; Atmospheric Absorption; Transmittance Modeling; Aerosols.

Descriptors :   *ATMOSPHERIC ATTENUATION, *DECISION MAKING, ACCURACY, AEROSOLS, ATMOSPHERE MODELS, AUTOMATION, CLIMATOLOGY, COMPUTERS, DATA BASES, DETECTION, EXTINCTION, FORTRAN, HAND HELD, INFRARED DETECTORS, INFRARED RADIATION, INPUT, MANUAL OPERATION, RANGE(DISTANCE), SHIP DECKS, SIGNALS, TABLES(DATA), TARGET ACQUISITION, COMPUTER PROGRAMS, TRANSMITTANCE, RESONANCE ABSORPTION

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE