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Proceedings Paper

Real-time radar interferometry of ocean surface height
Author(s): Marc Simard; Ernesto Rodriguez
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Paper Abstract

This paper discusses processing of interferometric signal to measure ocean topography. The method corrects for channel misregistration and geometric decorrelation using estimates of the current Earth geoid scenario. The channel misregistration is caused by slight change in the differential time delay between the signal received at one antenna with respect to the other. This algorithm corrects the misregistration over the entire swath with the Chirp-Z transform which resamples the signals appropriately. Another source of error, the geometric decorrelation (or baseline decorrelation), occurs because the targets within the resolution cell contribute different interferometric phases. In essence, the ground projected wavelengths are different for various look angles which produces a shift of the effective spectrum. This is corrected by shifting the spectra relative to one another and by applying filters to eliminate the non-overlapping part of the spectra. However, the co-registration and the spectral shift require the estimation of the current look and incidence angles. We use the Earth Ellipsoid WGS-84 and the Geoid EGM-96 to estimate the geometric parameters to describe the various viewing scenarios encountered around the Earth Geoid. We finally discuss the implications on the signal processing algorithm.

Paper Details

Date Published: 5 February 2004
PDF: 12 pages
Proc. SPIE 5238, Image and Signal Processing for Remote Sensing IX, (5 February 2004); doi: 10.1117/12.510779
Show Author Affiliations
Marc Simard, Jet Propulsion Lab. (United States)
Ernesto Rodriguez, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5238:
Image and Signal Processing for Remote Sensing IX
Lorenzo Bruzzone, Editor(s)

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