Cislunar Space Situational Awareness via Earth-Moon Resonant Orbits

The cislunar space is the gateway for future human deep-space exploration, where cislunar space situational awareness (CSSA) is critical. This paper investigates the performance of CSSA enabled by resonant orbits within the framework of the Earth-Moon circular restricted three-body problem. Resonant orbit families are constructed using an initial guess followed by a continuation method. Considering the solar exclusion angle, the observation capabilities of these resonant orbits for specific target areas in cislunar space are systematically evaluated, and several orbits particularly suitable for CSSA missions are identified. Furthermore, an observation strategy based on resonances with the solar synodic period is proposed to enhance CSSA efficiency. The results provide valuable guidance for future cislunar mission planning.