Distributed system Raptor code transmission method specific to deep space communication

Abstract

The invention provides a distributed system Raptor code transmission method specific to deep space communication, comprising the steps of: S1, separately performing system Raptor coding on source end raw information having a code length of K1 and K2, and sending coding to a same relay; S2, a relay R respectively storing coded identifications from source ends in a cache region E1 and a cache region E2, employing a DSRC algorithm to process data, and then sending the processed coded identifications to a destination end; and S3, a destination end D decoding the received coded identifications. The invention designs a distributed system Raptor code transmission method specific to the occasion where a plurality of detectors transmit towards the ground through orbiters, provides a joint decoding simplified scheme, theoretically analyzes and derivates a DSRC scheme, improves performance parameters of the scheme, performs simulation comparison with the distributed no-rate erasure correcting scheme of the prior art, and obtains a 99% decoding success rate when redundancy reaches 5%.

Description

technical field [0001] The invention relates to a code transmission method oriented to deep space communication, in particular to a distributed system Raptor code transmission method oriented to deep space communication. Background technique [0002] With the diversification of deep space exploration tasks and the continuous extension of the detection range, the amount of data and business types that need to be transmitted is increasing day by day, especially in the face of the needs of multimedia data services such as images, videos, and voices for deep space exploration in the future. The point-to-point support measures based on physical quantity gains are unsustainable, and the use of relay, collaboration, and even networked transmission is an inevitable trend in the development of deep space communications in the future; the "Space Interconnection Strategy Group" established by various aerospace organizations in the world including China (SISG), established the Delay / Dis...

AI Technical Summary

Problems solved by technology

The "Curiosity" Mars Exploration Rover that landed in October 2012 returned most of the video and image data to the earth through the "Odyssey" and "Mars Reconnaissance Orbiter", and the relay communication rate reached more than 40 times that of the direct link ; However, even with multi-hop network transmission, the single-hop link distance of interstellar communication in deep space is still many orders of magnitude larger than the distance of satellite communication in near-Earth, and the existing channel coding that has approached the Shannon limit cannot correct all bit errors

The 3-20 minute propagation delay between Mars and Earth makes the confirmation retransmission method of the existing transmission protocol very inefficient

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