5 February 2004 Real-time radar interferometry of ocean surface height
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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.
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Marc Simard, Marc Simard, Ernesto Rodriguez, Ernesto Rodriguez, } "Real-time radar interferometry of ocean surface height", Proc. SPIE 5238, Image and Signal Processing for Remote Sensing IX, (5 February 2004); doi: 10.1117/12.510779; https://doi.org/10.1117/12.510779
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