The GNSS-R approach improves altimetry, which is essential for maritime remote sensing data. High-precision altimetry requires carrier phase continuity, which is limited by several variables. This paper offered a grey model solution. The proposed method works for GNSS-R sea surface height measuring with centimeter-level accuracy. Field experiments process BeiDou satellite reflected signals in the B1 and B3 frequency bands, and GEO and IGSO inversion findings are analyzed. This method improves the GEO inversion effect, the satellite with a large altitude angle, and sea surface altimetry when comparing B1 and B3.
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