Variable coding modulation data transmission framing system and framing method for near-earth remote sensing satellite

Abstract

The invention belongs to the technical field of data transmission of near-earth remote sensing satellites, and particularly relates to a variable code modulation data transmission framing system for a near-earth remote sensing satellite which comprises a transmission frame framing module and a physical frame framing module. The transmission frame framing module is used for splitting on-satellite effective load data and then recombining the data to obtain a plurality of K-bit baseband frames; carrying out BB scrambling on each baseband frame, then carrying out BCH coding and LDPC coding to obtain a plurality of data transmission frames, and carrying out data interleaving on the data transmission frames. The physical frame framing module is used for carrying out code pattern mapping on each data transmission frame after data interleaving and then carrying out redistribution to obtain N data frames with specific modulation modes, adding a physical frame header to the data frame of the first specific modulation mode, and adding pilot frequencies among the remaining N-1 data frames of the specific modulation modes, and carrying out physical layer scrambling and baseband shaping filtering on the transmission frame data except the physical frame header.

Description

technical field [0001] The invention belongs to the technical field of data transmission of near-earth remote sensing satellites, and in particular relates to a frame system and method for variable coding modulation data transmission of near-earth remote sensing satellites. Background technique [0002] With the development of remote sensing satellite high-resolution images and integrated remote sensing payload technology, the data transmission capability of satellites to the ground is constantly facing new technical challenges. Facing the requirement that the code rate of payload data transmission reaches several Gbps, the ground station capability and channel coding capability are close to the limit of technical realization; the existing conventional data transmission technology needs to improve the data transmission capability, which requires a lot of channel and satellite resources. Bandwidth and transmission power have become resource bottlenecks. [0003] According to...

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Problems solved by technology

[0005] In the existing framing methods, multiple standards such as the concatenated concatenated convolutional code standard, the concatenated coding standard of BCH outer code and LDPC inner code coexist, and the framing scheme formulated by each standard is abstract and complicated, and the coding and modulation methods are not uniform. And there is no clear and clear implementation process, which is not conducive to the realization of the satellite launch and ground reception system

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