Next Generation GNSS for navigation of future SAR constellations

The next Generation of Global Satellite Navigation Systems (GNSS - GPS and Galileo) will provide enhanced performance with respect to signals, services, quality and quantity of measurements, availability, integrity and accuracy. Since in 2004, the European Commission (EC) and the USA signed an agreement about the compatibility and interoperability between GPS and Galileo, the combined use of both systems and respective measurements will have a significant impact on the design of future navigation systems in general. This paper will present results from simulations for a SAR formation flying mission. Applicability, advantages and limitations of GNSS based concepts for orbit- and attitude determination in the context of SAR formation missions in LEO will be outlined and discussed.