Accession Number : ADA509249


Title :   The Use of Commercial Remote Sensing Systems in Predicting Helicopter Brownout Conditions


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Rabaja, Christine K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a509249.pdf


Report Date : Sep 2009


Pagination or Media Count : 90


Abstract : Polarimetric Synthetic Aperture Radar (SAR) data from RADARSAT-2 is analyzed for detection of soils susceptible to helicopter brownout. Helicopter brownout occurs when downwash disturbs the dust and sand beneath the aircraft during takeoff, landing, and low altitude operations. Brownout may lead to pilot spatial disorientation and loss of control, causing helicopter damage or destruction, as well as personnel injury or death. The likelihood of helicopter brownout is related to soil moisture content, particle size distribution, and surface texture. This research explores the polarimetric signatures of soils, and determines if these characteristics can be used to predict areas that are susceptible to helicopter brownout. Preliminary results show that helicopter brownout regions can be predicted by means of a simple threshold.


Descriptors :   *SOILS , *POLARIMETRY , *SYNTHETIC APERTURE RADAR , HELICOPTERS , VISIBILITY , TEXTURE , REMOTE DETECTION , THESES , PARTICLE SIZE , MOISTURE CONTENT


Subject Categories : Soil Mechanics
      Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE