Satellite-borne high-speed data multiplexer system and realizing method thereof

Abstract

The invention discloses a satellite-borne high-speed data multiplexer system and a realizing method thereof. The system comprises a data grouping module, a data sub-packaging module, an SDRAM (Synchronous Dynamic random access memory) optimal control module, a virtual channel scheduling module and a channel coding module, wherein the data grouping module receives 30 paths of information source data; the 30 paths of information source data are divided into 5 groups according to a transmission priority or a strategy of balanced data volume; the data sub-packaging module is used for splitting and organizing packets in each path of the information source data in the 5 groups so as to form 5 groups of protocol unit data; the SDRAM optimal control module is used for respectively writing 5 groups of protocol unit data into 5 SDRAMs for caching and reading control so as to form 5 groups of virtual channel data; the virtual channel scheduling module is used for performing dynamic scheduling management and multiple connection on the 5 groups of virtual channel data and one group of empty frames so as to be combined to form one path of form type code flow; and the channel coding module is used for isolating the one path of form type code flow from an FIFO (first in and first out) by a local clock, and coding and scrambling the isolated form type code flow so as to form one path of data transmission frame as the output of the data multiplexer system.

Description

technical field [0001] The invention relates to a space-borne high-speed data multiplexer system and a realization method, belonging to the field of spacecraft data transmission systems. Background technique [0002] The theoretical basis of data multiplexing is the concept of virtual channels. Divide a physical channel into multiple logical channels, each logical channel is identified separately and transmits a data flow, each data flow can use different services, a logical channel is a virtual channel. The virtual channel enables one physical space channel to be shared by multiple high-level data streams in a time-division multiplexed manner, so that multiple types of data can be transmitted on one physical channel. [0003] The spaceborne data multiplexer system is responsible for receiving multi-source data in space data transmission, that is, multiple source data of different formats and different rates (compressed visible light data, spectral data, SAR data, reconnais...

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Problems solved by technology

[0011] (1) Only small burst length is supported, and the burst length is fixed ( Figure 5 The t1 time is relatively short, generally less than 16K clock cycles, and for each channel of data, the length of t1 is fixed) multi-source data multiplexing;

[0012] (2) The data cache unit generally chooses off-chip FIFO, off-chip SRAM or on-chip RAM as the buffer, and corresponds to the input source data one by one (each channel of source data corresponds to an off-chip buffer), and the data buffer rate is relatively low. Low, small cache capacity;

[0014] (4) The processing rate is low (generally less than 700Mbps)

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