On the GNSS-R Interferometric Complex Field Coherence Time

Details On the GNSS-R Interferometric Complex Field Coherence Time On the GNSS-R Interferometric Complex Field Coherence Time

2004-06-18

arxiv.org/abs/physics/0406084v2

Physics

Atmospheric and Oceanic Physics

Starlab Preprint 18062004-01. V2 corrected a typo, V3 adds a clarification on the definition of Modified Fraunhofer approximat

Scientific paper

In this paper we focus on the microwave bistatic scattering process, with the aim of deriving an expression for the interferometric complex field auto-correlation function from a static platform. We start from the Fresnel integral and derive the auto-correlation function in the Fraunhofer and Modified Fraunhofer regime. The autocorrelation function at short times can be expressed as a Gaussian with a direction dependent time scale. The directional modulation is a function of the angle between the scattering direction and the wave direction. The obtained relation can be used for directional sea state estimation using one or more GNSS-R coastal receivers.

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