Post-processed attitude and baseline estimation for the GPS attitude and navigation experiment (GANE)

摘要

The GPS Attitude and Navigation Experiment (GANE) flown on STS-77 simulated the environment of the GPS antenna array and inertial instrument suite planned for the International Space Station (ISS). This paper describes a methodology for attitude estimation and GPS baseline determination intended for use with the ISS and presents results for the GANE. Attitude estimates based on the GANE sensors agree to within 0.12 deg with an attitude reference derived from the Orbiter high accuracy inertial navigation system. GPS line bias estimates differ from prelauch surveyed val-ues by as much as 0.04 cy, while baseline estimates differ from ground measurements up to 2 cm. Gyro bias estimates are in the range of 4 deg/hr, which are unrealistically large for the quality of the gyros used. The full state estimator requires good GPS satellite coverage to converge to reliable values for all parameters.