Realtime Estimate and Calibration Algorithm for Systematic Error in Multiple Range-Rate Measurement System
Hua Zhao · Journal of Spacecraft TT&C Technology · 2012
The systematic errors of measurement equipment degrade tracking and filtering accuracy of space object tracking systems.This paper proposes a simplified mathematic model for the systematic errors of multiple range-rate measurement systems.The system errors are extended to state variables with augmented dimension UKF(Unscented Kalman Filter) to jointly estimate the states of objects and systematic errors so as to calibrate the systematic errors and improve state estimation accuracy.Two scenarios with constant and linear time-varying errors are set for simulation and analysis of the algorithm under the condition that there exit only two types of errors of a master station and slave stations.Simulation results show that the proposed algorithm effectively calibrates systematic errors and improves tracking accuracy by at least 80% in both scenarios and the impact is significantly minimized when systematic errors are constant.