Abstract
Achieving high accuracy and precision altimetric results using space-based Global Navigation Satellite System Reflectometry (GNSS-R) is a challenge. This paper focuses on enhancing the accuracy of space-based GNSS-R altimetric measurements by means of an improved geometric model. The foundation of the improved geometric model is the signal processing principles for GNSS-R altimetry. This model considers the high dynamics of the receiving platform for space-borne scenarios, which is not accounted for in current models. Theoretical and simulated studies were conducted to evaluate the magnitude of the altimetric error caused by the receiver dynamics, reaching the conclusion that the receiver's dynamics can lead to metre-level error, mainly depending on the trajectory angle of the receiver. An experiment using data from the TDS-1 mission produces an error of 3.4m which confirms the result obtained from theoretical and simulated studies.
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