 The extreme temperature range, from on the side of the spacecraft facing the Sun to on the side facing away from the Sun, imposed strict requirements for temperature control in the design of the detectors.Given the conditions of the three-body system of the Earth, Moon and a space probe, the orbit design of lunar orbiters is more complicated than that of Earth-orbiting satellites, which only deal with a two-body system.The Chang'e 1 and Chang'e 2 probes were first sent into highly elliptical Earth orbits.