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Data transmission method based on AOS encoding

A data transmission method and data technology, applied in the field of communications, can solve problems such as uncollected data, no explanation or report found, wrong type of format, etc., so as to improve the efficiency of effective data transmission, reduce the phenomenon of data dissatisfaction, and prevent errors. Effect

Active Publication Date: 2010-06-09
XIAN INSTITUE OF SPACE RADIO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is completely in accordance with the AOS (Advanced Orbiting Systems) format coding design standard suggested by CCSDS, the VCDU data unit area is not used in segments, and the length of the data unit area can only be designed to be divisible by the time length of the forward data of one input data form; when there is a wide range of forward and reverse time changes, the phenomenon that the data in the AOS transmission format is not filled with enough frames occurs frequently because it cannot be divisible by all. This phenomenon shows that the AOS frame set according to the fixed data length only The transmission efficiency of individual regular data blocks that are evenly divisible is high, and the transmission efficiency of non-divisible regular data blocks is severely reduced. When the transmission efficiency drops to a critical state, there will be tight time slots in the front and rear frame arrangements, resulting in lost data. Faults such as number or wrong format
[0003] In order to solve the technical bottleneck of this kind of data transmission, the design of AOS format needs to consider its adaptability requirements. Therefore, a design method for segmented use of VCDU data formatted in AOS format is proposed, which can solve the problem very well. Efficiency Decrease in AOS Formatting
[0004] At present, there is no description or report of related technology similar to the present invention, and similar materials at home and abroad have not been collected yet.

Method used

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  • Data transmission method based on AOS encoding
  • Data transmission method based on AOS encoding
  • Data transmission method based on AOS encoding

Examples

Experimental program
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Effect test

example 1

[0086] The AOS formatting program performs continuous format generation according to the working clock frequency. Receive external input data during the period, when the current valid data arrives, first fill the data into the La data block of the VCDU data area, and at the same time, the la variable counts. When the length of L bytes is satisfied, the AOS frame format is generated and an error control field is formed Data, one frame of AOS format ends; if the la variable does not satisfy L, the forward data ends, the inverse data starts, and invalid data is written to the Lb data block of the VCDU data area in the subsequent time, and the lb variable counts at the same time, when the L byte is satisfied After the length, the AOS frame format generates and forms the error control field data, and the AOS format of one frame ends; if the backtracking is short, la+lb is less than L, the backtracking data ends, a new forward journey starts, and a new forward journey is written in t...

example 2

[0089] The AOS formatting program performs continuous format generation according to the working clock frequency. Receive external input data during the period, when the current inverse invalid data arrives, first fill the data into the Lb data block of the VCDU data area, and set the la variable to 0 at the same time, and the lb variable counts. When the length of L bytes is satisfied, the AOS frame format Generate and form the error control field data, and the AOS format of one frame ends; if the lb variable does not satisfy L, the reverse data ends, the forward data starts, and the subsequent time writes valid data to the L-La-Lb data block of the VCDU data area, At the same time, the L-la-lb variable counts until it is 0, the AOS frame format is generated and formed, and one frame of AOS format ends.

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Abstract

The invention relates to a data transmission method based on the AOS encoding. Based on the CCSDS-suggested AOS-formatted design standard, an AOS-formatted VCDU data field is designed in a way that the data field can be divided into sections for use, compiled into a VHDL hardware logic descriptive language, and downloaded to a programmable device FPGA, and the AOS-formatted processing and output of the SAR data stream by hardware such as the FPGA, FIFO and the like is realized. By using a method of dividing the VCDU data unit into sections, when processing the current AOS-formatted frame, the valid data area at the formatted tail can continue reading in the formatted frame because new trace data appears in advance due to the short retrace time of the input data, thereby improving the transmission efficiency of the valid data of the frame, greatly reducing the frame-insufficient phenomena of the data, and being especially suitable for the situations of the trace and retrace wide-range change of the data before and after inputting. The invention effectively inhibits the formatted frame from being filled with an insufficient frame of the valid data, ensures the AOS-formatted efficiency, and enables the data processing to work at a more stable speed all the time. The invention can adapt to the random change of the trace and the retrace of the input data and prevent the formatting mistake.

Description

technical field [0001] The invention relates to a data transmission method, in particular to an AOS coding-based data transmission method, and belongs to the technical field of communication. Background technique [0002] For the load input format data containing forward and reverse journeys, the time length of forward and reverse journeys can be continuously changed in a large range. Forward data is valid data, and reverse data is invalid data. If it is completely in accordance with the AOS (Advanced Orbiting Systems) format coding design standard suggested by CCSDS, the VCDU data unit area is not used in segments, and the length of the data unit area can only be designed to be divisible by the time length of the forward data of one input data form; when there is a wide range of forward and reverse time changes, the phenomenon that the data in the AOS transmission format is not filled with enough frames occurs frequently because it cannot be divisible by all. This phenomen...

Claims

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Application Information

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IPC IPC(8): H04B1/66
Inventor 杨旭朱红张文凯张景阳
Owner XIAN INSTITUE OF SPACE RADIO TECH
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