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A computational method to model radar return range in a polygonally based, computer-generated-imagery simulationDescribed is a method for modeling a ground-mapping radar system for use in simulations where the terrain is in a polygonal form commonly used with computer generated imagery (CGI). The method employs a unique approach for rapidly rejecting polygons not visible to the radar to facilitate the real-time simulation of the radar return. This rapid rejection of the nonvisible polygons requires the precalculation and storage of a set of parameters that do not vary during the simulation. The calculation of a radar range as a function of the radar forward-looking angle to the CGI terrain is carried out only for the visible polygons. This method was used as part of a simulation for terrain-following helicopter operations on the vertical motion simulator at the NASA Ames Research Center. It proved to be an efficient means for returning real-time simulated radar range data.
Document ID
19870003534
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Moran, F. J. (NASA Ames Research Center Moffett Field, CA, United States)
Phillips, J. D. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1986
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-TM-88324
NAS 1.15:88324
A-86313
Accession Number
87N12967
Funding Number(s)
PROJECT: RTOP 505-66
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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