Deep-space-communication-oriented cross-layer joint file transmission method and system

Abstract

The invention is applicable to the field of deep space communication, and provides a deep-space-communication-oriented cross-layer joint file transmission method. An image is compressed by adopting a CS (chirp scaling) algorithm in the transmission process of the image, so that the image can be jointly optimized with the Spinal code of a bottom layer and then is transmitted; a cross-layer joint transmission mechanism refers to that the CS image compression of an application layer, the CS erasure correction of a transmission layer and the Spinal code of a data link layer / physical layer are jointly optimized and a transmission mechanism is designed in combination with an LTP (Licklider transmission protocol), and after finishing sending certain data, a sending end determines a symbolic number to be sent at a next moment through Markov prediction and feedback information without waiting for feedback. After receiving the feedback, the sending end pauses sending the data, processes the feedback, and additionally sends the symbolic number aiming at a coding block with an error, and the additionally sent symbolic number is decoded together with the symbolic number sent before. On the premise that certain reliability is guaranteed, the effectiveness of a system is improved.

Description

technical field [0001] The invention belongs to the field of deep space communication, in particular to an image data transmission method. Background technique [0002] Deep space communication has the characteristics of long distance, long delay, and intermittent link, which makes the contradictory relationship between the reliability and effectiveness of deep space communication more prominent. For this problem, the traditional solutions include increasing the receiving / transmitting antenna size, increasing the carrier frequency, increasing the transmitting power, controlling the noise level of the receiving system, etc., but the method based on physical quantity gain is ultimately unsustainable. Efficient channel coding and reasonable transmission mechanism play an important role in deep space communication. [0003] In channel coding, existing high-performance coding techniques such as Turbo codes and LDPC codes perform well under medium SNR conditions, but are still un...

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Problems solved by technology

like image 3 As shown, the disadvantage is that due to the need for the cooperation of the lower layer error detection mechanism, the structure is redundant and the implementation is more complicated

Both of these two protocols have improved the communication constraints of deep space channels, but SCPS has not made corresponding changes with the increase of communication bandwidth, and there are serious security problems

The CFDP protocol has not completely improved the transmission mechanism of the TCP / IP protocol, such as data transmission and forwarding after the connection is established first. It is still based on the end-to-end retransmission mechanism, which cannot well deal with the difficulty of huge delay in deep space communication. , so in the deep space environment, the application of these two protocols also has certain limitations

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