Design And Optimazition Of Beidou And Small Satellites Joint Navigation System In Space Information Networks

Space information networks are consisted of different kinds of equipment,such as synchronous satellite or medium and low orbit satellites,stratospheric balloons and unmanned aircraft and others.Space information networks can achieve real-time access,transmission.As an important national infrastructure,strategic high ground,space information networks can achieve global seamless coverage,for the ground to provide emergency rescue,navigation and positioning,ocean navigation,aerospace transportation,aerospace monitoring and other important services.Based on the geosynchronous orbit satellite backbone network,this paper uses the method of Beidou navigation system and small satellites to realize the joint navigation service for the focus area.In this paper,the rectangular navigation area with 20 deg latitude and 18 deg longitude is used as the target area for the study.By using the common ground trajectory constellation design method,by comparing the multiplicity of the constellation,the orbital number of orbital plane is 4,the number of single orbit satellites is 7.The combination is small satellite constellation.It is called small satellite navigation system.Secondly,based on the small satellite navigation system,combined with the space information networks,the Beidou geosynchronous orbit satellites are available as satellites.The paper proposes a back-delete model based on the satellite service information matrix,which will be used in satellites and small satellite navigation System satellite,the algorithm is used to match the satellite service time.The optimal joint navigation system of small satellite and Beidou geosynchronous orbit satellites is obtained by comparing the coverage multiplicity,considering the number of visible satellites and the DOP accuracy factor.Finally,the article uses STK and MATLAB simulation tool,getting the return of the model under 13 small satellites and two Beidou geosynchronous satellites.It is also called joint navigation system.In order to increase the positioning accuracy,the algorithm can get 14 small satellites and two Beidou geosynchronous satellites.After comparison and analysis.The joint navigation system with the optimal number of satellites is obtained and the joint navigation system with the best coverage and precision is obtained.The small satellite navigation system designed with the common ground trajectory constellation method and the Beidou small satellite joint navigation system optimized under the back-delete model help to enhance the navigation of the local area by means of the satellite of the spatial information backbone network.This paper provides a mathematical method to integrate the navigation resources of satellite resources,and gives the satellite navigation scheme of emergency navigation system and joint navigation system.By reducing the transmission cost and improving the functional density,this paper guarantees the navigation enhancement of the spatial coverage area Function,which provides a reference for the construction and service of spatial information network.