GEOSCAN Search Results: Fastlink


TitlePlans for radarsat image data calibration
AuthorSrivastava, S K; Shepherd, N W; Lukowski, T I; Hawkins, R K
SourceAdvances in Space Research vol. 17, no. 1, 1996 p. 89-96,
Alt SeriesNatural Resources Canada, Contribution Series 20181902
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; remote sensing
ProgramCanada Centre for Remote Sensing Divsion
AbstractRADARSAT, the first Canadian earth observation satellite, is scheduled for launch in 1995. The mission is to provide to users calibrated C-band HH polarized Synthetic Aperture Radar (SAR) data products for five years, at different incidence angles, resolution and area coverage. The SAR is also designed to operate in the ScanSAR mode by combining different elevation beams. Emphasis in the RADARSAT Program is provision of operationally calibrated products which insures targets can be compared radiometrically within each scene and between scenes. In order to maintain end-to-end radiometric quality for the mission life, plans are to perform external calibration routinely using precision transponders and homogeneous targets. The calibration data will be analyzed off-line in the calibration workstation and resulting calibration parameters update will be provided to the ground processor to generate calibrated products. The short term variations in the gain of the sensor electronics will be tracked by the on board internal calibration system and these calibration data will be transmitted to the ground with the radar signal data. This allows the processor to automatically compensate for radar gain variations in between the external calibration periods and thus maintain the required radiometric accuracy. This paper describes the calibration requirements for the mission and plans for internal and external calibrations. An outline of the image quality management is also presented.

Date modified: