Abstract
Considering that in conventional GNSS-R (Global Navigation Satellite System-Reflection) altimetry, the reflected signals are cross-correlated with a locally generated clean replica of the transmitted signal, interferometric processing consists of the measurement of the complex cross-correlation between the direct and reflected signals. It allows the exploitation of P(Y) code and other civil signals to maximize the height estimation precision. This paper presents a new processing method called QSE (Quadrature Staggered Extracting) which utilizes P(Y) code to explore a further improvement of the altimetry precision. The assessment of the QSE processing procedure illustrates GPS L1 band as an example. In these conditions, this paper analysis the up-looking SNRs obtained by using QSE processing and traditional coherent demodulation respectively. The analysis of the altimetry precision shows that the results obtained by adopting QSE processing improve by a factor about 1.15 as compared to the results obtained by using coherent demodulation.
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Acknowledgments
This study is supported by National High Technology Research and Development Program 863 of China (NO. 2013AA122402, NO. 2011AA120501).
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Yu, C., Xiu, C., Li, W., Yang, D. (2015). A New Method Based on QSE Processing for Interferometric GNSS-R Ocean Altimetry. In: Sun, J., Liu, J., Fan, S., Lu, X. (eds) China Satellite Navigation Conference (CSNC) 2015 Proceedings: Volume I. Lecture Notes in Electrical Engineering, vol 340. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46638-4_17
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DOI: https://doi.org/10.1007/978-3-662-46638-4_17
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