Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jass...15..183s&link_type=abstract
Journal of Astronomy and Space Sciences, vol. 15, no. 1, p. 183-196.
Astronomy and Astrophysics
Astronomy
Scientific paper
The Synthetic Aperture Radar (SAR) image and the Digital Elevation Model (DEM) of an target area are put into use to generate three dimensional image map. An method of image map generation is explained. The orbit and attitude determination of satellite makes it possible to model signal acquisition configuration precisely, which is a key to mapping image coordinates to geographic coordinates of concerned area. An application is made to RADARSAT in the purpose of testing its validity. To determine the orbit, zero Doppler range is used. And to determine the attitude, Doppler centroid frequency, which is the frequency observed when target is in the center of antenna's view, is used. Conventional geocoding has been performed on the basis of direct method(mapping image coordinates to geographic coordinates), but in this research the inverse method (mapping from geographic coordinates to image coordinates) is taken. This paper shows that precise signal acquisition modeling based on the orbit and attitude determination of satellite as a platform leads to a satellite-centered accurate geocoding process. It also shows how to model relative motion between spaceborne radar and target. And the relative motion is described in ECIC (earth-centered initial coordinates) using Doppler equation and signal acquisition geometry.
Choi Kyu-Hong
So Jin Wook
Won Joong-Sun
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