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Fountain-code-based telemetry data frame synchronization method

A telemetry data and frame synchronization technology, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of unsuitable fountain code frame structure, data frame loss, reorganization, etc., and achieve the effect of improving data recovery rate

Active Publication Date: 2012-11-28
BEIJING RES INST OF TELEMETRY
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AI Technical Summary

Problems solved by technology

For general telemetry systems, the method of adding frame synchronization code groups is often used to complete the structural reorganization of block codes; however, telemetry systems using fountain codes are mainly aimed at data transmission of flashing channels. The position of the synchronization code group may cause the loss of the entire data frame
Therefore, this traditional frame synchronization method is not suitable for frame reorganization of fountain codes

Method used

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  • Fountain-code-based telemetry data frame synchronization method
  • Fountain-code-based telemetry data frame synchronization method
  • Fountain-code-based telemetry data frame synchronization method

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Embodiment Construction

[0022] figure 1 It is a schematic diagram of fountain code concatenated coding and synchronization structure. The fountain code concatenated code system includes an outer code encoder, an outer code synchronization flag controller, an inner code encoder and an inner code block synchronization code generator.

[0023] The outer code encoder completes the encoding function of the fountain code.

[0024] The external code synchronization mark controller inserts a synchronization mark into the fountain code symbol. The controller inserts a synchronization mark into each fountain code symbol, and each fountain code symbol and the inserted synchronization mark together form an inner code information block, which is then sent to the inner code encoder.

[0025] The inner code encoder completes the encoding function of an error correction code as an inner code, and generates a check bit after each inner code information block. The inner code generally chooses code patterns with bett...

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Abstract

The invention discloses a fountain-code-based data frame synchronization method, which comprises a telemetry data frame synchronization coding step and a telemetry data frame synchronization decoding step. For fountain-code-based data recovery characteristics, a data frame can be synchronized by adding a plurality of synchronization markers into a code block, the accurate position of received information in an original data frame can be recovered according to reserved synchronization markers even though a part of synchronization markers are lost in a suddenly interrupted channel environment, and a fountain code has the characteristic of capability of recovering data of which the packet loss rate is within a certain proportional range, so that a problem about the synchronization of the data frame under any sudden interruption condition is solved, and a data recovery rate is greatly increased. By the method, the total volume of recovered data can be increased from 90 percent to about 99 percent under the condition of channel sudden interruption probability of 10 percent.

Description

technical field [0001] The invention relates to a data frame synchronization method based on fountain codes, in particular to a method for frame synchronization of telemetry data by a telemetry system using fountain code technology on a physical layer channel, and belongs to the field of communication technology. Background technique [0002] During the flight of rockets, satellites and other aircraft, the influence of their own attitude changes or external interference may cause attenuation of telemetry data reception, and even flashes and interruptions of varying degrees may occur. In order to make up for the lack of channel gain, the transmission power can be increased or the antenna aperture (gain) can be increased, and one of the most cost-effective methods is to use channel coding and decoding technology. [0003] Fountain code is a data recovery technology for scattered data. This type of code is generally applied to upper-layer protocols such as the network layer to ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L7/00
Inventor 林一丁兴文王晓波
Owner BEIJING RES INST OF TELEMETRY
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