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FORTRAN program for analyzing ground-based radar data: Usage and derivations, version 6.2A postflight FORTRAN program called 'radar' reads and analyzes ground-based radar data. The output includes position, velocity, and acceleration parameters. Air data parameters are also provided if atmospheric characteristics are input. This program can read data from any radar in three formats. Geocentric Cartesian position can also be used as input, which may be from an inertial navigation or Global Positioning System. Options include spike removal, data filtering, and atmospheric refraction corrections. Atmospheric refraction can be corrected using the quick White Sands method or the gradient refraction method, which allows accurate analysis of very low elevation angle and long-range data. Refraction properties are extrapolated from surface conditions, or a measured profile may be input. Velocity is determined by differentiating position. Accelerations are determined by differentiating velocity. This paper describes the algorithms used, gives the operational details, and discusses the limitations and errors of the program. Appendices A through E contain the derivations for these algorithms. These derivations include an improvement in speed to the exact solution for geodetic altitude, an improved algorithm over earlier versions for determining scale height, a truncation algorithm for speeding up the gradient refraction method, and a refinement of the coefficients used in the White Sands method for Edwards AFB, California. Appendix G contains the nomenclature.
Document ID
19950026772
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Haering, Edward A., Jr. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Whitmore, Stephen A. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Subject Category
Computer Programming And Software
Report/Patent Number
NAS 1.60:3430
H-1892
NASA-TP-3430
Accession Number
95N33193
Funding Number(s)
PROJECT: RTOP 505-68-50
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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