AAS 97-112

77 GPS ATTITUDE AND NAVIGATION EXPERIMENT (GANE)

M. E. Lisano, McDonnell Douglas Aerospace; J. R. Carpenter, NASA Johnson Space Center

Abstract

A recent Shuttle mission, STS-77, offered the first opportunity for operational use of the "dynamic" Wide-Area Differential GPS (DWA DGPS) orbit determination technique. The mission carried the GPS Attitude and Navigation Experiment (GANE), one of a series of risk mitigation experiments being performed by the Shuttle program for the International Space Station. GPS coarse acquisition pseudoranges were processed and four orbit arcs were generated. A modest-fidelity dynamic model consisting of 30x30 gravity, attitude-dependent drag, and modelling of CG-to-GPS antenna offset, were used in the filter. Assessments of the DWA DGPS filter performance are discussed.