Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510947h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 10, 1990, p. 10947-10963. Research supported by USAF and U.S. Ar
Physics
6
Doppler Radar, Planetary Surfaces, Radar Echoes, Radar Imagery, Backscattering, Harmonics, Io, Least Squares Method, Linear Equations, Rotating Spheres, Signal To Noise Ratios, Titan
Scientific paper
This paper describes a technique for using echo power-spectra for making radar images of spherical planetary targets. In developing the Doppler-radar imaging system, the target's reflectivity distribution is expanded in a truncated spherical harmonic series; the distribution of echo power in rotational phase and the Doppler frequency are obtained in form of a system of linear equations which express the echo spectra as functions of the series coefficients. To estimate the coefficients from an observed phase-Doppler distribution, the inversion is cast as a least-squares problem, and is solved using singular value decompositions, yielding a linear imaging system which can be fully characterized by its impulse response as a function of latitude. Simulations were designed and used to explore the capabilities of Doppler radar imaging, and the sensitivity of imaging to such factors as subradar altitude coverage and signal-to-noise ratio was investigated.
Hudson Raymond Scott
Ostro Steven J.
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