On-Orbit Performance of the TRITON GNSS-R Payload

The TRITON microsatellite was launched in October, 2023 through the Arianespace's Vega rocket. The mission objective of the TRITON is to perform GNSS (Global Navigation Satellite System) reflectometry (GNSS-R) experiments in a hope to enhance the predication capability of typhoons. The main payload is an GNSS receiver that is capable of receiving and processing scattered GNSS signals from the surface of the Earth. The paper presents on-orbit results of the TRITON GNSS-R receiver payload encompassing the quality of the delay Doppler maps which are the main observable of the GNSS-R payload, the observation of the scattering GNSS signals in orbit by using the payload, and the calibration procedure and results for wind retrieval. In comparison with some existing GNSS-R missions, the TRITON GNSS-R payload facilitates a delay Doppler map with wide range of 128 code phase delays and 64 Doppler shift bins. This enables the use of 1D waveform or 2D image based data processing.