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File transmission method in deep space communication

A file transfer and deep space communication technology, applied in the field of deep space communication, can solve the problems of difficulty in the practical application of deep space file transfer methods, low success rate of single transmission, and few compatible studies

Inactive Publication Date: 2013-05-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
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Problems solved by technology

This method can significantly reduce the transmission time when the redundancy overhead is not large (less than 25%). However, the method of no feedback at all pointed out in the article does not guarantee that all data can be completely and correctly decoded by the receiving end.
[0009] The current deep space file transfer method has the problem of low success rate of single transmission and low link utilization, which makes it difficult to provide reliable services with simple strategies in practical applications
Also, there is less research on how to make the improved deep space file transfer method compatible with the international standard space file transfer protocol
These problems make it difficult for the practical application of the improved deep space file transfer method

Method used

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  • File transmission method in deep space communication
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  • File transmission method in deep space communication

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Experimental program
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Embodiment

[0075] Assume that the bit error rate of the underlying service for the transport protocol is 10 -5 , taking the Mars probe 400 million kilometers away from the earth to transmit a file with a size of 10MB to the ground station at an information rate of 100Kbps as an example, the specific implementation process of the present invention will be described.

[0076] Assuming that the user requires that the decoding failure probability is 10 -2 The length of the data segment should be as small as possible to reduce the complexity of encoding and decoding. After simulation, the length of the selected data segment is K=100. At the same time, in order to balance protocol efficiency and link packet loss performance, set L min = 512 bytes, L max =1024 bytes. Then, using the formula Calculated to get 102.4≤N≤204.8. Take the smallest integer that satisfies the condition as N=103, and divide the file into 103 data segments. The length of each packet is byte. After the above calc...

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Abstract

The invention relates to a file transmission method in deep space communication and belongs to the technical field of deep space communication. According to the method, the predetermined coding redundancy is used for carrying out fountain coding on file data grouping, then, the sending is carried out through a link, a mode that a sending end actively stops is adopted, the one-step successful transmission probability of files is improved, the file transmission efficiency is improved, the bandwidth waste in large delay deep space communication environment caused by the passive stop of the sending end is avoided, and the link utilization rate is improved; and meanwhile, a reliable file transmission method in CFDP (CCSDS (consultative committee for space data system) file delivery protocol) is combined, the contents of a file data PDU (protocol data unit) and the contents of an NAK (negative acknowledge) PDU are defined, the reliable transmission of deep space files on the basis of the fountain coding is realized, and good protocol compatibility and practicability are realized.

Description

technical field [0001] The invention relates to a file transmission method for deep space communication, belonging to the technical field of deep space communication. Background technique [0002] The characteristics of deep space communication links are large propagation delay, high channel bit error rate, periodic interruption and high asymmetry. The deep space file transmission method is to complete the file according to the user's transmission quality requirements based on the deep space communication link with the above characteristics. efficient transmission. [0003] The deep space file transfer method includes two main technical directions, one direction is to improve the most widely used TCP protocol in the ground Internet to adapt it to deep space communication links, and the other direction is to specially develop deep space communication links for the characteristics of deep space communication links Empty file transfer standard. Improvements to the TCP protoco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/16H04L1/18H04L29/08
Inventor 杨雷安建平卜祥元卢继华朱海周
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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