Title :
An internal calibration scheme for polarimetric Synthetic Aperture Radar system
Author :
Wang, Shuo ; Yu, Weidong ; Qi, Haiming
Author_Institution :
Chinese Acad. of Sci., Grad. Univ., China
Abstract :
Two important aspects of internal calibration of polarimetric Synthetic Aperture Radar (SAR) are discussed, that is, system gain calibration and individual Transmit/Receive Module (TRM) calibration. System gain variation is measured utilizing the internal calibration loop. Dualchannel TRM gain and phase calibration is carried out using Orthogonal Phase Coding (OPC), in which signal of individual TRM is phase-encoded according to a set of orthogonal codes in order to be separated from the composite calibration signal of all TRMs. Calibration results are developed both theoretically and through simulation in the case of TRM failure. A crosstalk model is used to investigate the effect of imperfect isolation between the two polarization channels of each TRM on the calibration error.
Keywords :
calibration; crosstalk; radar polarimetry; synthetic aperture radar; crosstalk model; dual channel TRM gain; imperfect isolation; individual transmit/receive module calibration; internal calibration scheme; orthogonal phase coding; polarimetric synthetic aperture radar system; system gain calibration; Calibration; Extraterrestrial measurements; Gain measurement; Phased arrays; Polarimetric synthetic aperture radar; Polarization; Power combiners; Radar tracking; Switches; Transmission line measurements; Calibration; Failure; Phase Coding; SAR; Transmit/Receive Module;
Conference_Titel :
Geoscience and Remote Sensing Symposium,2009 IEEE International,IGARSS 2009
Conference_Location :
Cape Town
Print_ISBN :
978-1-4244-3394-0
Electronic_ISBN :
978-1-4244-3395-7
DOI :
10.1109/IGARSS.2009.5417442
