Design and Implementation of Load Switching in High Broadband Satellite Networks
Low earth orbit satellite constellations have the advantages of small transmission delay,large system capacity,rich appli-cation scenarios,and low manufacturing costs,and have become the core link of building satellite Internet.High bandwidth and high-speed switching technology is one of the key technologies to achieve inter satellite and satellite ground data service forwarding.There-fore,we will focus on the design of load switching in the high bandwidth Low earth orbit satellite network to meet the requirements of high bandwidth switching,low delay error,high reliability and other on-board switching in the satellite Internet.To adapt to extreme space environments,a space grade Field Programmable Gate Array(FPGA)implementation was designed.Due to limitations in the inter-face,cache,and logic resources of aerospace grade FPGA chips,this design will use two xc7V690t FPGA to jointly implement an ag-gregated Crossbar architecture,solve the problem of resource constraints,and design a reasonable layout of each unit module,mainly in-cluding processing buses and cross node networks,to achieve inter satellite to ground business exchange function through switching mod-ules.Evaluate the performance of the system from the aspects of transmission bandwidth,packet loss rate,and transmission delay,and a-chieve a switching system with a total transmission bandwidth of 40 Gbit/s,support for 8-priority Quality of Service(QoS)guarantee,and latency less than 50 μs,providing feasible solutions for resource limited space work environments.
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