Accession Number : ADA260956


Title :   Methodology Investigation Final Report Desert Atmospheric Effects on Target Acquisition


Descriptive Note : Rept. for Oct 91-Sep 92,


Corporate Author : ARMY DUGWAY PROVING GROUND UT


Personal Author(s) : Biltoft, Christopher A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260956.pdf


Report Date : Dec 1992


Pagination or Media Count : 33


Abstract : Deleterious effects on electrooptical wave propagation through the atmosphere's surface boundary layer are caused by temperature and humidity fluctuations. These effects on the refractive index are parameterized in the form of the refractive index structure parameter Cn2, which is a function of the temperature (CT 2) and humidity (CQ 2) structure parameters and the temperature- humidity cross-structure parameter (CTQ). The magnitude of CTQ is determined by the frequency-dependent correlation rTQ between temperature and humidity fluctuations. Many researchers assume, based on dimensional analysis techniques, that rTQ is unity and treat CTQ and Cn2 as Monin-Obukhov similarity variables. This assumption can lead to large errors for propagation modeling, particularly when applied to infrared and millimeter wavelength propagation in desert atmospheric conditions. Measurements needed to define rTQ in a desert environment are lacking due to instrumentation deficiencies. Additional instrumentation and methodology development is needed to define temperature- humidity correlation effects on Cn2. Target acquisition models can then be updated to provide more reliable predictions of atmospheric effects on target acquisition.... Target Acquisition, Spectrum Analysis, Desert, Millimeter Wave, Meteorology, Refractive Index.


Descriptors :   *TARGET ACQUISITION , *WAVE PROPAGATION , *METEOROLOGY , *SPECTRUM ANALYSIS , *DESERTS , FREQUENCY , FUNCTIONS , PROPAGATION , MEASUREMENT , METHODOLOGY , TEMPERATURE , STRUCTURES , BOUNDARY LAYER , INSTRUMENTATION , DEFICIENCIES , ERRORS , CORRELATION , BOUNDARIES , SURFACES , VARIABLES , TARGETS , MILLIMETER WAVES , ATMOSPHERICS , HUMIDITY , INDEXES , REFRACTIVE INDEX , ENVIRONMENTS , ACQUISITION , PREDICTIONS , MODELS , LAYERS , PARAMETERS


Subject Categories : Meteorology


Distribution Statement : APPROVED FOR PUBLIC RELEASE