Title :
ENVISAT-1 advanced synthetic aperture radar system calibration
Author :
Desnos, Y.-L. ; Suchail, J.-L. ; Karnevi, S. ; Hurd, D.
Author_Institution :
Eur. Space Res. & Technol. Centre, Noordwijk, Netherlands
Abstract :
An Advanced Synthetic Aperture Radar (ASAR) operating at C-band has been selected for the Envisat-1 payload ensuring continuity with ERS-1 and 2 AMI SAR and featuring enhanced capability in terms of coverage, range of incidence angles, polarisation, modes of operation. This enhanced capability is provided by significant differences when compared to AMI in the instrument design: a full active array antenna equipped with distributed transmit/receive modules which provides distinct transmit and receive beams, a digital waveform generation for pulse chirp generation, a block adaptive quantisation scheme and a scansar mode of operation by beam scanning in elevation. This paper will present the calibration concept proposed for ASAR and detail the different steps to derive the end to end system transfer function to allow the end user to derive locally the backscattering coefficient of the target of interest
Keywords :
calibration; geophysical equipment; geophysical techniques; radar applications; radar polarimetry; remote sensing by radar; spaceborne radar; synthetic aperture radar; ASAR; C-band; ENVISAT-1; SAR; active array antenna; block adaptive quantisation scheme; calibration; end to end system transfer function; geophysical measurement technique; land surface; microwave SHF; polarisation; radar remote sensing; scansar; spaceborne radar; synthetic aperture radar; terrain mapping; Adaptive arrays; Ambient intelligence; Antenna arrays; Calibration; Instruments; Payloads; Polarization; Pulse generation; Receiving antennas; Synthetic aperture radar;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1995. IGARSS '95. 'Quantitative Remote Sensing for Science and Applications', International
Conference_Location :
Firenze
Print_ISBN :
0-7803-2567-2
DOI :
10.1109/IGARSS.1995.520466
