GEOSCAN Search Results: Fastlink

GEOSCAN Menu


TitleValidation and simulation of RADARSAT imagery
 
AuthorWessels, G J; Lowry, R T; Raney, R K
SourceProceedings of the Tenth Canadian Symposium on Remote Sensing/Compte rendu du Dixième symposium canadien sur la télédétection; by Thompson, M D (ed.); Brown, R J (ed.); vol. 2, 1986 p. 841-854
Image
Year1986
Alt SeriesEarth Sciences Sector, Contribution Series 20060067
Meeting10th Canadian Symposium on Remote Sensing / 10ième symposium canadien sur la télédétection; Edmonton; CA; May 5-8, 1986
Documentbook
Lang.English
Mediapaper
ProgramDepartment of Supply and Services Canada
AbstractIn support of the RADARSAT project, the SARSIM software package has been developed to generate simulated spaceborne SAR imagery. SARSIM is intended to enable users of radar data to evaluate the impact of radar parameter changes on data utility and to allow design engineers to simulate trade-offs at the image level. The package differs from previous efforts in both its scope and flexibility, and in the accessibility for general users without extensive computer expertise.

The package filters and resamples fine resolution airborne or synthetic test data to simulate the parameters of the radar under consideration. The result is known as the "Radar Reflectivity Map" and serves as input to the simulation routines.

The coherent fading or speckle of the spaceborne SAR is simulated by generating a large two-dimensional array of complex noise values. This array is joined top-to-bottom and side-to-side to create a large "number ball". This number is Fourier transformed to allow accurate simulation of both range and azimuth processing. The user can specify the position, shape and weight for each sub-aperture or look. Each look is inverse Fourier transformed, detected, and incoherently summed. The resulting speckle ball is used as multiplicative noise and is used in conjunction with the appropriate additive thermal noise to modify the reflectivity map and produce the simulation.

This paper validates the process by comparing a simulation generated from the CCRS SAR-580 airborne radar data with NASA's SIR-B radar data collected over a test site near Montreal. In addition to describing the procedures and validations, the expected RADARSAT imagery has been simulated using the larger area coverage available from INTERA STAR-1 data.
GEOSCAN ID222233

 
Date modified: