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The Impact of Inter-Modulation Components on Interferometric GNSS-Reflectometry

AutorLi, Weiqiang; Rius, Antonio; Fabra, Fran; Martín-Neira, Manuel; Cardellach, Estel ; Ribó, Serni; Yang, Dongkai
Fecha de publicación11-dic-2016
EditorMultidisciplinary Digital Publishing Institute
CitaciónRemote Sensing 8(12): 1013 (2016)
ResumenThe interferometric Global Navigation Satellite System Reflectometry (<i>i</i>GNSS-R) exploits the full spectrum of the transmitted GNSS signal to improve the ranging performance for sea surface height applications. The Inter-Modulation (IM) component of the GNSS signals is an additional component that keeps the power envelope of the composite signals constant. This extra component has been neglected in previous studies on <i>i</i>GNSS-R, in both modelling and instrumentation. This letter takes the GPS L1 signal as an example to analyse the impact of the IM component on <i>i</i>GNSS-R ocean altimetry, including signal-to-noise ratio, the altimetric sensitivity and the final altimetric precision. Analytical results show that previous estimates of the final altimetric precision were underestimated by a factor of <inline-formula> <math display="inline"> <semantics> <mrow> <mn>1</mn> <mo>.</mo> <mn>5</mn> <mo>∼</mo> <mn>1</mn> <mo>.</mo> <mn>7</mn> </mrow> </semantics> </math> </inline-formula> due to the negligence of the IM component, which should be taken into account in proper design of the future spaceborne <i>i</i>GNSS-R altimetry missions.
Identificadoresdoi: 10.3390/rs8121013
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