SOLAR RADIATION PRESSURE EFFECTS ON VERY HIGH-ECCENTRIC FORMATION FLYING

摘要

A real alternative to Lagrange point very low perturbedrnorbits, for universe observation missions, are high eccentricrnEarth orbits (HEO). Combination of high eccentricityrnand very large semi-major axis leads to orbits with anrnimportant part of flight time far from Earth and its perturbations.rnModeling this particular relative motion is thernscope of this paper.rnMain perturbation in HEO orbits are solar radiation pressurern(SRP) and lunisolar effects, but formations arernmainly affected by SRP effects. The modellization ofrnthese effects is done in two ways. First we introduce thernSRP effects in the equations of the relative acceleration.rnSecond, we obtain explicit analytical expressions of therntemporal evolution of the relative motion. Resulting expressionsrnenable very fast computations.rnThese models are used to study HEO Universe observationrnmissions. We focus on two different problems: estimationrnof thrust for satellite formation keeping and evaluationrnof collision risk. We also consider the influence ofrnthe difference of ratio surface/mass between satellites.