Study On The Application Of The L2 Point Halo Orbit Of The Earth-moon System In The Magpie Bridge Satellite Laser Ranging

In recent years,the development of deep space exploration has made great progress.The deep space exploration activity in China started in the chang`e-1 lunar exploration in 2007.The deep space exploration has gone through 12 years and has achieved fruitful results.A large number of lunar images,information such as the space environment and space weather is transmitted back to Earth,providing a basis for us to study the moon.In this paper,based on the chang`e-4 relay satellite——Magpie bridge satellite laser ranging,the related research is carried out.The article first briefly describes the background and significance of the Magpie bridge satellite.This paper introduces the working conditions observation equipment and current observation equipment to be used in the Magpie bridge satellite laser laser ranging.The circular restricted three-body problem for calculating the target halo orbit of the Magpie bridge satellite is also introduced.Then based on the basis of orbital mechanics,the target halo orbit corresponding to the satellite relay communication task of the Magpie bridge satellite is calculated by numerical method.The dynamic characteristics of the halo orbit are extended,including the magnitude of the target orbital velocity that affects the telescope tracking during the satellite laser ranging,the orbital operation period and the invariant manifold near the halo orbit.Next step,the calculated target halo orbit is used to analyze and calculate the laser ranging of the Magpie bridge satellite: The distance between the observation station and the Magpie bridge satellite is calculated.For better analysis of the lunar reflected light noise,the distance between the Magpie bridge satellite and the moon is calculated.After observing the observation conditions by previous observation experience,the time window of the satellite laser ranging observation task of the bridge is calculated.The key factors affecting the photon number and range success rate of the satellite laser ranging echo are analyzed.Combined with the experience oflunar laser ranging,the method of improving the success rate of the laser satellite ranging is given.Finally,in the absence of the actual measurement of the Magpie bridge satellite laser ranging,the experimental verification scheme was designed under the conditions allowed by the observation equipment.The theoretical calculation was verified by the actual measurement results,which provided a theoretical basis for the subsequent development of the Magpie bridge satellite laser ranging.