The Research And Simulation On Deep Space Communication Protocols

This dissertation focuses on Deep Space Communication protocols, especiallyAdvanced Orbiting System (AOS) in Data Link Layer and Licklider TransmissionProtocol (LTP) in Transport Layer, which are significant in Delay Tolerant Network(DTN).DTN describes networks with the following features: extremely long RTT due to theremote distance, temporary link connectivity, low SNR and high bit error rate, asymmetrybetween uplink and downlink, a strict restriction on the design of communicationequipments. Inter Planetary Network (IPN), a typical DTN environment, in whichcommon terrestrial internet protocols cannot work normally. As a result, the research onAOS and LTP is urgent and necessary.This dissertation studies the following aspects:1General description of AOS and simulation of its basic functions of AOS viaOPNET based on protocols released by CCSDS (Consultative Committee for Space DataSystems);2Overall and detailed description of LTP according to RFC5325, RFC5326andRFC5327;3Based on communication with Mars, models and assesses LTP via OPNETsimulation software. The result proves that LTP can support multiple sessionssimultaneously, provide reliable or best effort transmission, and work with ARQ.The achievement of this dissertation lays a good foundation for the further study andrealization of the protocols in hardware, which has high theoretical and practical values.