MOMSNAV: precise navigation package for remote sensing

In order to support the German MOMS-2P mission on PRIRODA with orbit and attitude data a high precision navigation package called MOMSNAV is developed in contract to the German space agency (DARA). MOMS (Modular Optical Multispectral Scanner) together with MOMSNAV are scheduled to fly on-board the PRIRODA module of the space station MIR in 1995. The navigation package for DGPS orbit and inertial attitude determination consists of a spaceborne GPS receiver, a redundant high-precision gyro package, a data management system and a power control and distribution unit. Combined with terrestrial GPS reference stations it will provide an accuracy of ±5 m in position and ±10" in relative attitude using post processing. This paper describes basic system and mission parameters and the MOMSNAV architecture. Specific problems of (D-)GPS on a large space station are discussed. They include RCVR dynamics, shading, multipath and degradation of a DGPS navigation solution due to unbalanced errors in tropospheric and ionospheric errors