A Comparison of Nonlinear Filters for Orbit Determination and Estimation
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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This research compares the performance of three filters which have been applied to the problem of orbit determination using actual satellite tracking data obtained from ground based radars. The states estimated are the osculating classical orbital elements and the satellite ballistic coefficient. The dynamics used to propagate the state vector forward include the two-body acceleration plus perturbations due to atmospheric drag, zonal harmonics in the geopotential through J2, and tesseral harmonics in the geopotential through J44. The atmospheric density model used is an exponential model that includes diurnal variations and variations in the decimeter solar flux. The observations used to update the state vector estimates are slant range, azimuth, and elevation relative to a radar site. the three filters investigated in this research are a nonlinear least squares filter, an Extended Kalman filter, and a Gauss second order filter. Data are processed for three different satellites.
- Atmospheric Physics
- Active and Passive Radar Detection and Equipment
- Unmanned Spacecraft