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Proceedings Paper

Calibration requirements for airborne SAR interferometry
Author(s): Jordi J. Mallorqui; Marc Bara; Antoni Broquetas
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Paper Abstract

One of the main limitations on the use of SAR interferometry to automatically generate Digital Elevation Models (DEM) is related with both the accurate calibration of the system parameters and its stability from flight to flight. The unstable movements of an airborne SAR platform can be corrected during the processing step, as long as those movements are recorded in an accurate manner. Errors and time drifts in the system parameters or on the plane position and attitude measurements lead to geolocation errors in the final DEM. A calibration method based on the so-called “sensitivity equations”, which relate the target location error with the error on the estimation of the system parameters, is described. The equations have been derived by differentiating the interferometric geolocation equations in closed form for the most general case in a squinted geometry. The interferometer parameters considered are the baseline length and elevation, common time delay, interferometric constant phase, plane position and attitude angle offsets, etc. The equations can be used to both calibrate a single DEM from different ground control points (GCP) spread along the swath and the frill interferometer from well-known located comer reflectors (CR).

Paper Details

Date Published: 21 December 2000
PDF: 12 pages
Proc. SPIE 4173, SAR Image Analysis, Modeling, and Techniques III, (21 December 2000); doi: 10.1117/12.410657
Show Author Affiliations
Jordi J. Mallorqui, Univ. Politecnica de Catalunya (Spain)
Marc Bara, Univ. Politecnica de Catalunya (Spain)
Antoni Broquetas, Univ. Politecnica de Catalunya (Spain)

Published in SPIE Proceedings Vol. 4173:
SAR Image Analysis, Modeling, and Techniques III
Francesco Posa; Luciano Guerriero, Editor(s)

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