GPS/Galileo Miniaturised Multi-Frequency Space Receiver (GAMIR)

Peter A. Krauss, Georg Klein, Stefan Sassen, Alberto Garcia-Rodriguez, Josep Roselló, Andreas Grillenberger, Markus Markgarf, Angelo Consoli, Francesco Piazza, Eveline Gottzein

Abstract:	The GPS/Galileo Miniaturised Multi-Frequency Space Receiver (GAMIR) is a new development at Airbus Defence and Space (formerly EADS Astrium), in cooperation with the GNSS Technology and Navigation Group at DLR's German Space Operations Center (DLR/GSOC) and the Swiss research and development company Saphyrion. GAMIR is the Airbus Defence and Space next generation GNSS navigation receiver for space applications from LEO to GEO. GAMIR is based on the previously developed LION Navigator, which itself is using the “Advanced GPS/Galileo ASIC” AGGA-4. A configurable RF distribution connects up to four single or multiband antennas to up to four narrow-band RF front-ends, which are specifically selected for the required GNSS signals on E1/L1, L2, E5b, or E5a/L5. The individual RF front-ends are built using the RF front-end chipset SY1007 / SY1017C from Saphyrion. The AGGA-4 includes on chip all required logic functionality for base band processing. Digital parts further needed are memory chips and line drivers for the communication interfaces. Selectable are MIL-STD-1553 bus, SpaceWire, and UART. An additionally discrete interface provides the pulse per second (PPS). Dedicated functional software modules take care of the processing. A sensor module acquires and tracks the down-converted GNSS signal, providing channel measurements to a navigation solution module and decoded GNSS navigation messages to a navigation planning module. The navigation solution module feeds the channel measurements into a Kalman filter to determine position, velocity, and time (PVT) of the user spacecraft. PVT is also needed by the navigation planning module in conjunction with the user spacecraft attitude to allocate visible GNSS satellites to the channels of the sensor module. Using dual frequency signals either only from the GPS constellation or from the Galileo constellation, or using dual frequency signals from both constellations together in a mixed mode, sub-meter position accuracy and around one millimeter per second velocity accuracy has been measured with hardware in the loop test for LEO. Analyses and simulations for GEO predict the position accuracy in the order of 30 to 40 m. Hardware in the loop tests for GEO are in preparation.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	1513 - 1523
Cite this article:	Krauss, Peter A., Klein, Georg, Sassen, Stefan, Garcia-Rodriguez, Alberto, Roselló, Josep, Grillenberger, Andreas, Markgarf, Markus, Consoli, Angelo, Piazza, Francesco, Gottzein, Eveline, "GPS/Galileo Miniaturised Multi-Frequency Space Receiver (GAMIR)," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 1513-1523.
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