Research And Implementation Of Inter-satellite Link Topology Routing Algorithm Based On Hybrid System

The development trend of satellite navigation systems is to introduce inter-satellite links.The main functions of inter-satellite links include inter-satellite ranging and data transmission.Based on inter-satellite links,continuous observation can be achieved,thereby solving the problem of monitoring satellites outside the country.The networking design and routing planning of the inter-satellite link is an important part of the construction of the inter-satellite link,and it is the guarantee for the efficient operation of the inter-satellite link.Based on the actual requirements of inter-satellite ranging and navigation message uplink injection,this paper studies the networking strategy and routing algorithm of the satellite navigation system.The main contents are as follows:(1)Inter-satellite link system and mission analysis.The inter-satellite link is currently based on the microwave inter-satellite link of the time division system,and the future development direction is the laser inter-satellite link of the continuous system.Therefore,there has been a hybrid inter-satellite link that uses the time division system and the continuous system at the same time.Analyze the inter-satellite link characteristics and problems under the time division system,explain the improvements brought about by the addition of the continuous system,and summarize the characteristics of the hybrid system.(2)Design of hybrid system inter-satellite link planning algorithm.The planning algorithm is divided into topology planning algorithm and routing planning algorithm.For continuous system topology,the topology planning of the laser link backbone network is completed in the order of intra-orbit-satellite-ground-high and low orbit-between orbits to ensure that data can be quickly transmitted across tracks;According to the topology of the time division system,the satellites are classified according to whether they are inside or outside the country and whether they carry laser payloads,and a multi-priority topology orchestration algorithm for non-peer-to-peer networks is proposed to ensure the uniformity and rationality of the chain construction and satisfy the range of satellite nodes in the entire network.Claim.Based on the topological structure,a routing search algorithm based on time sequence evolution is proposed on the basis of the routing criteria of the shortest time slot and the minimum number of hops to improve the data transmission performance of the inter-satellite network.(3)Simulation and performance testing of inter-satellite links.Through the development of prototype software to simulate the inter-satellite link transmission scenario under the hybrid system,the key indicators were verified,and the distance measurement function of the inter-satellite link was verified by the number of single-satellite links and the PDOP value.The distance measurement function of the inter-satellite link was verified by the transmission under the time division system.The comparison of time delay and routing hop count verifies that the algorithm can improve the data transmission capability of the inter-satellite link.By verifying the effectiveness of the algorithm in this paper,it demonstrates the useful value of the work in this paper in practical applications.