Stationkeeping of Geosynchronous Spacecraft Using a Hybrid Orbit Propagator and Optimization Technique

摘要

WITH advances in space technology, current-generation geo-nstationary spacecraft are often designed to operate for at leastn10 years and are driven by multiple-mission scenarios. The idealngeostationary orbit has a constant semimajor axis, zero eccentricity,nand zero inclination. These orbital elements, however, tend to deviatenfromthe ideal values because of various perturbing forces, includingnthe Earth’s oblateness, the gravitational forces exerted by the sunnand moon, the solar-wind pressure, etc. Therefore, stationkeepingn(i.e., maintaining the position of a geostationary spacecraft within andesignated longitude slot) becomes necessary, and the requirementsnfor stationkeeping are becoming more stringent, not only becausenof the limited longitudinal resource, but also because of the realnpossibility of signal-frequency interference with neighboring space-ncraft.