Numerical computation of the electromagnetic bias in GNSS-R altimetry
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessOpen Access
In radar altimetry, the electromagnetic (EM) bias is originated by the smaller reflectivity of wave crests than troughs; thus, the average sea surface height is underestimated. Bias uncertainty is currently the largest factor in altimetry error budgets. The EM bias in a bistatic forward-scattering configuration at L-band, such as in Global Navigation Satellite Systems Reflectometry (GNSS-R) altimetry, remains one of the major sources of uncertainty in the altimetry error budget. In this paper, the EM bias is computed using numerical simulations. To do so, a time-dependent synthetic non-Gaussian sea surface is created using the Pierson-Moskowitz and Elfouhaily sea surface height spectra and spreading function. The sea surface is then discretized in facets and
CitationGhavidel, A., Schiavulli, D., Camps, A. Numerical computation of the electromagnetic bias in GNSS-R altimetry. "IEEE transactions on geoscience and remote sensing", 01 Gener 2016, vol. 54, núm. 1, p. 489-498.