G-SPHERE-S GNSS: New GNSS Receiver for Operational Orbit Restitution of MICROSCOPE Satellite

摘要

G-SPHERE-S GNSS receiver is a new spatial GNSS receiver developed by SYRLINKS (FRANCE). This receiver is one of the main equipment which allows accurate operational orbit restitution and timing on MICROSCOPE satellite (this orbit restitution is not done in real time but with a post processing tool in CNES). The boarding on MICROSCOPE constitutes the first flight of this GNSS receiver. MICROSCOPE is a microsatellite, from CNES (French Space Agency) launched by a Soyuz rocket in April 2016 from Kourou (GUYANA). The main mission of MICROSCOPE is to verify the Einstein equivalence principle, related to gravitational versus inertial mass, with an accuracy never reached before. MICROSCOPE has a mass of 300 kg and its altitude is about 710 km (Low Earth Orbit). The orbit is an 18h Sun-synchronous circular orbit. The overall GNSS subsystem "G-SPHERE-S GNSS" will be presented in this paper.