Attitude pointing schemes and spacecraft configurations for libration-point-orbit spacecraft

The libration points in the Sun-Earth or Earth-Moon systems have potential applications in observing solar activities (EL1), space-based observatories and infrared astronomy (EL2), half-way space-stations for lunar exploration (LL1) and communications for satellites on Moon's far side (LL2). Different from the traditional design methodology for libration point missions, new attitude pointing schemes are proposed in this paper to guide the design of spacecraft configurations based on the ideas of removing rotating components as much as possible. The fixed installations of transmission antenna, radiating surface and solar array make the SSO platforms of satellite be qualified for the EL1- or EL2-point mission with further advances in fixing the array and removing the battery. The fixed transmission antenna and zero-incident-angle array make the GEO platforms be qualified for the LL1- or LL2-point mission with improvements on killing the worst incident angle of ±23°26′ and the umbra/penumbra at vernal equinox. Addressed are the structure of attitude determine and control system, the analytic algorithm to derive the orbital frame and the performance of this control system.