Design And Implementation Of Satellite Self-Organizing Network Routing Protocol

In recent years,with the development of aerospace industry and astronautics,Micro/nano satellite is becoming one of the most cutting-edge directions of research on aerospace domain.Limited by the performance of the single micro/nano satellite,the micro/nano satellite networking has become the main trend.The routing protocol of traditional IP networks cannot meet the needs of the micro/nano satellite ad-hoc network,so it is necessary to improve the existing routing protocol according to the characteristics of the micro/nano satellite constellation network.After years of research,the development of ground-based ad-hoc routing protocols is relatively mature.Among them,the proactive Ad hoc On-Demand Distance Vector Routing protocol(AODV),and the reactive Optimized Link State Routing(OLSR)are the most widely used.First,this thesis designs a lightweight OLSR routing protocol for the micro/nano satellite ad-hoc network.This protocol combines the characteristics of the micro/nano satellite constellation network with high dynamics and predictable orbit.It simplifies and adapts the existing OLSR routing protocol,and aims to provide efficient and reliable information communication guarantee for the micro/nano satellite space missions.This article also builds the OPNET simulation platform,imports the orbit of the micro/nano satellite with STK,and realize a system simulation of the micro/nano satellite constellation network in different scenarios.The simulation experiment proves that the lightweight OLSR routing protocol we designed has shown excellent network performance and robustness in the micro/nano satellite cluster network.Then,in view of the micro/nano satellite orbit is predictable,an improved method based on link survival time optimization OLSR protocol is proposed.By increasing the interaction of location and other information in the OLSR protocol,the link survival time is predicted based on the unfixed relative position of satellite.Combined with the link survival time,the HELLO message transmission interval,Multipoint Relays(MPR)election,routing selection,and backup routing table calculation in the OLSR protocol are adjusted to optimize the OLSR protocol.Subsequent simulation experiments show that the OLSR protocol based on link survival time optimization has a significant improvement in transmission success rate and robustness.Finally,based on olsrd,this thesis implements the lightweight micro/nano satellite routing protocol designed above in Linux system,and verifies the feasibility of this protocol through simulation experiments.