A SDREF for autonomous navigation of two spacecrafts using relative position measurements

The autonomous navigation of two satellites based on relative position measurements is studied in this paper. The state dependent Riccati equation filtering (SDREF) is used for orbit determination. The difference between SDREF and EKF in computation and model approximation is compared and the influence of eccentricity to the accuracy of navigation with SDREF is studied. The relationship between eccentricity change and estimation accuracy of SDREF, EKF and UKF is verified by numerical simulations.