ESA GNC Conference Papers Repository
Development of High-Precision GPSR Applicable to GEO and GTO-to-GEO Transfer
NEC Space Technologies, Ltd. has developed a Global Positioning System Receiver (GPSR) named GEO GPSR that can be used at a geostationary orbit (GEO) and geostationary transfer orbit phase to GEO (GTO-to-GEO transfer) in collaboration with Japan Aerospace Exploration Agency (JAXA). The GPSR is composed of an antenna for GEO, two antennas for GTO-to-GEO transfer, three low-noise amplifiers (LNAs), and a processor unit. The GPSR can adapt GPS signals of the various strength emitted from the edge of the GPS antenna?s main lobe or side lobe at GEO and GTO-to-GEO transfer. Simulation and qualification test (QT) results showed that the GEO GPSR can satisfy its performance specifications under the conditions of GEO and GTO-to-GEO transfer. The partial model of the GEO GPSR was launched on the Optical Data Relay Satellite (ODRS). As a result of evaluating the onboard GPSR data on ODRS demonstrated that the GEO GPSR works as expected at GEO.