Coherent Components of GNSS-R Signal Observed from CYGNSS Raw IF Data

Yang Wang and Y. Jade Morton

Abstract: Coherent GPS signal reflections are frequently observed from the raw intermediate frequency (IF) data recorded by CYGNSS. With the coherent GNSS-R carrier phase and high-rate carrier-to-noise ratio (C/N0) measurements, we can potentially achieve centi-meter level altimetry and high-resolution soil moisture monitoring, flood detection, etc. In this paper, we present two approaches, i.e., openloop (OL) and closed-loop (CL), to process the coherently reflected GPS signals. The CL approach is implemented with an adaptive Kalman filter (AKF) tuned by an empirical dynamics noise model and real-time estimated C/N0. Four segments of data, containing coherent reflections from coast area, shallow ocean bank, land, and a lake, are used to evaluate the tracking algorithms performances and the coherent carrier phase and C/N0 measurements.
Published in: Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019)
September 16 - 20, 2019
Hyatt Regency Miami
Miami, Florida
Pages: 3319 - 3326
Cite this article: Wang, Yang, Morton, Y. Jade, "Coherent Components of GNSS-R Signal Observed from CYGNSS Raw IF Data," Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019, pp. 3319-3326.
https://doi.org/10.33012/2019.17102
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