Simulation of GNSS-R Signals in Arbitrary Viewing Geometry with a Closed-Form Bistatic Two-Scale Model

Martino, Gerardo Di; Simone, Alessio Di; Iodice, Antonio; Riccio, Daniele; Ruello, Giuseppe

doi:10.1109/igarss47720.2021.9554743

Cited by 1 publication

(2 citation statements)

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“…GNSS-R processing chain and receive antenna beamwidth are accounted for as well for the evaluation of the seareflected signal SNR. Similar analyses were presented in [27,28]. Here we extend such analyses considering a wider set of acquisition geometries, and, additionally, provide a more general expression for the received signal strength which allows for more accurate results as discussed in detail in the following sections.…”

Section: Introductionmentioning

confidence: 59%

“…It can be noted that both ( 5) and ( 6) provide a more accurate evaluation of the received signal strength respect to the simplified formulations adopted in [27,28], that can be obtained from (6) by further neglecting variations of the zenith and azimuth scattering angles within the scattering area A 0 . Such an assumption, despite being reasonable in spaceborne configurations, leads to inaccurate results with airborne GNSS-R due to the much lower receiver altitude [21].…”

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confidence: 99%

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Link Budget Analysis for GNSS-R Sea Surface Return in Arbitrary Acquisition Geometries Using BA-PTSM

Martino¹,

Simone²,

Iodice³

et al. 2022

Remote Sensing

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In this article, we present a link budget analysis for Global Navigation Satellite System (GNSS) signals scattered off the sea surface in arbitrary acquisition geometries. The aim of our study is to investigate the reliability of the Geometrical Optics (GO) scattering model, which accurately describes sea surface scattering at and near the specular reflection direction, in properly modeling the sea surface return in far-from-specular acquisition geometries, which are of interest for maritime surveillance purposes and where GO is expected to fail. To this end, we adopted the recent Bistatic Anisotropic Polarimetric Two-Scale Model (BA-PTSM), which revealed good agreement with advanced scattering models, such as the second-order Small Slope Approximation (SSA2), regardless of the acquisition geometry, with the advantage of a reduced computational complexity. Numerical results have been derived for both circular polarization channels and for both spaceborne and airborne GNSS-Reflectometry (GNSS-R). It has been shown that, as long as conventional GNSS-R processing is assumed, GO can be safely adopted for simulation and analysis of spaceborne GNSS-R data regardless of the acquisition geometry and sea state, whereas more accurate scattering models, e.g., BA-PTSM, should be used for airborne receivers in far-from-specular configurations.

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Section: Introductionmentioning

confidence: 59%

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confidence: 99%