Research On Topology Structure Characteristics Of Star Light Background In Satellite Laser Communication

Satellites are moving and running ceaselessly around the earth. They monitor andgain the amount of information which is related with our life. And play a very crucialrole in the modern information society. Satellite laser communication can transmit hugeamounts of information quickly and accurately. In order to establish the spaceinformation highway, grasp the initiative in the space information field, all over theworld is fully in the research of satellite laser communication technology.The background noise of stars light will form some spot noises in the CCD field ofthe receiver, and interfere the way of identifying the beacon spot accurately, whichinfluent communication performance seriously. So there is an important research toeliminate influence of laser communication link by background noise of stars lighteffectively, and find the method of beacon spot identification rapid and effective in thesatellite laser communication.The main object of study in this paper is to test and verify the beacon spotidentification method based on topological structure of background noise from starslight by simulate laser communication link between ARTEMIS Satellite and SPOT-4Satellite in the plan of SILEX.First, according to the law of Kepler and the quality of satellite orbit, calculate thedistance vector of the earth core and Satellite in the ARTEMIS satellite in thegeosynchronous orbit and SPOT-4satellite in the sun synchronous orbit. Byestablishing the node coordinates system, making the distance vector of two satellitesswitch to the equator coordinate system. And then judging whether stars in the CCDview by the geometry relationship between object and satellites. Considering simulationexperiment of laser communications link between the ARTEMIS satellite and theSPOT-4satellite,the result shows the time of laser communication link maintaining andthe number of stars which in the CCD view in5days.Moreover, based on the beacon spot identification method by the topologicalstructure of background noise points from the stars light, analysis the image of spotdistribution position which collected by the CCD view. And attain the positiondistribution images of stars and the beacon spot appeared in the field of CCD. Andverify the effectiveness of beacon spot identification method, which is based ontopological structure of background noise from the stars light.Finally, put forward the method of judgments by many times, it can resolve suchproblem effectively, just like the number of star in CCD view Angle have changed in a short time.This paper supplies foundation for using identification method based on the beaconspot by the topological structure of background noise points from the stars light inpractice. And it becomes guidelines for development of satellite laser communicationtechnology in China.