Research On The Routing Technology For Of Nano-satellite Constellation Network

In recent years,the Global Navigation Satellite System(GNSS)has been developed rapidly,and through the cross-combination of GNSS technology and Occultation Research,it provides a highly effective and feasible technical solution in the field of atmospheric detection.With the increase number of satellites in GNSS constellation network,it faces the demand of the Satellite to transmit the satellite’s data to the earth station in time.The routing technology as a key technology of the current GNSS Satellite constellation Research plays a crucial role to meet the demand.And routing technology is related to the efficient and reliable timely transmission of the data,which in turn affects the efficiency of the micronano Satellite System.Based on the demand of data transmission of the large-scale GNSS occultation micro-nano satellite constellation in time,and limited network conditions of the processing and storage capacity of the micro-nano satellite,this paper studies on the measurement standard of routing,the optimization design of static routing and the optimization design of dynamic routing.The following research work has been completed in the paper :Firstly,the orbit and constellation model of the Micro-Nano satellite are analyzed,the scene and principle of GNSS occultation are explained,and the coverage effect of GNSS occultation microsatellite constellation in different configurations is analyzed.With the consideration of economic factor,the constellation configurations with both a good coverage and economic cost are provided,which provides basis for the construction of the high-speed data transmission network and routing design of it.Secondly,in order to solve the problem of the timely transmission of data from constellation,the paper gives a detailed analysis of the data transmission mode and the constraint conditions of the inter-satellite link(ISL)of micro-nano satellite in the highspeed data transmission network of the constellation.This paper analyzes the topology configuration of the high-speed data transmission network,and studies the relationship between the least delay path and the least hop path of the network.The results provide the theoretical basis for weights and measures for the routing of the micro-nano satellite constellation.Then,from the perspective of static routing,the paper analyzes the principle of static routing algorithm in the existing satellite network and the problems existing in the high-speed data transmission network of the micro-nano satellite constellation,After that the paper gives an improved algorithm of the classical snapshot sequence(SSS)routing algorithm MDTN-SSS.The algorithm is optimized on the shortness of the snapshot sequence algorithm in the high-speed data transmission network,which makes the routing network getting a better performance on the storage cost and the packet loss rate.It means that the MDTN-SSS is more suitable for the highspeed data transmission network of micro-nano satellite constellation than the SSS.This study makes an effective exploration to solve the problem of transmitting the detection data of the constellation to the ground station in time.At last,from the perspective of dynamic routing,this paper describes the network model of ad-hoc network,which is the closest scene to the high-speed data transmission network of micro-nano satellite constellation in dynamic scene.Then the paper illustrates the problems existing in the classical algorithm of Ad-hoc network,and gives the optimized algorithm mdtn-olsr,which is based on the classical OLSR protocol.The performance of mdtn-olsr in network throughput,packet delivery rate,and routing overhead is optimized as compared to the original protocol,which is more consistent with the requirements of the routing scenario of micro-nano satellite network.This study makes an effective exploration to solve the problem of transmitting the detection data of the constellation to the ground station in time.