Deep space file transfer method based on relay store-forward

Abstract

The invention provides a deep space file transfer method based on relay store-forward, used for transmitting a file to a receiving terminal from a transmitting terminal by virtue of a relay satellite. The deep space file transfer method based on relay store-forward comprises a transmitting terminal-to- relay satellite stage and a relay satellite-to-receiving terminal stage... According to the deep space file transfer method based on relay store-forward disclosed by the invention, in a high-error-rate deep space environment, gain of a delay negative acknowledgement type CFDP (ccsds file delivery protocol) based on the relay store-forward is increased by dozens to hundreds of astronomical units compared with the traditional point-to-point direct transfer protocol scheme, relay amplification forward protocol scheme and relay decoding forward protocol scheme in the aspect of transmission delay index.

Description

technical field [0001] The invention relates to a deep space file transmission method based on relay store-forward. Background technique [0002] According to different retransmission mechanisms, the existing deep space communication file transfer protocols mainly fall into two categories: [0003] 1) TCP / IP protocol [0004] In the context of the Internet (Internet), it is established under the assumptions of unlimited bandwidth, low delay, low bit error rate, and continuous communication. The establishment of a TCP connection requires the sender and the sender to negotiate a handshake, that is, the formal start of file data transmission requires at least For a round-trip propagation, the TCP protocol uses a hierarchical routing protocol based on real-time state calculations. The addressing of the autonomous system needs to pass through the Border Gateway Protocol (BGP), while inside the system through IS2IS (Intermediate System to Intermediate System), OSPF (Open Shortest...

AI Technical Summary

Problems solved by technology

In the deep space network with large link delay or delay bandwidth product, various TCP improved protocols have little difference and poor performance, which cannot meet the task requirements of efficient transmission of deep space files

[0009] Although compared with the TCP / IP protocol, the efficiency of CFDP's feedback mechanism has been significantly improved, but in order to ensure reliable transmission, CFDP still needs to feed back multiple NAKs and a small amount of ACK information, and the continuous increase of transmission distance has increased this The round-trip delay of interaction reduces the transmission efficiency of CFDP

In particular, poor channel bit error rate conditions will lead to an increase in the number of data packet losses, increasing the number of file feedback retransmissions, thereby increasing the time required for reliable file transmission

For example: when the bit error rate is close to 10 -4 When , the simulation curve of CFDP file transmission delay expectation in the direct transmission mode shows that its performance has seriously deteriorated

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