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Frame synchronization method and system of DVB-S2X system superframe

A DVB-S2X, frame synchronization technology, applied in the field of satellite communications, can solve the problems of low signal-to-noise ratio, large frequency offset, and low probability of frame capture of ground terminal frames

Active Publication Date: 2022-01-04
成都中科微信息技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a frame synchronization method and system for a DVB-S2X system superframe to solve the situation that there is a large frequency offset and a low signal-to-noise ratio when the ground terminal of a low-orbit satellite is receiving, so that the frame capture probability of the ground terminal is problem of getting low

Method used

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  • Frame synchronization method and system of DVB-S2X system superframe

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Embodiment 1

[0050] Such as figure 1 As shown, this embodiment proposes a frame synchronization method for a DVB-S2X system superframe, including the following steps:

[0051] Step 100, importing the received data and calculating the total length of the received data and the length of the time interval;

[0052] Among them, the total length of the received data can be obtained by analyzing how many sign bits the received data contains, and the total length of the received data is denoted as L re , the method to calculate the length of the time interval is:

[0053] L skip = L re ×(1-ppm);

[0054] Among them, L skip Indicates the time interval length, and ppm is the sampling frequency of received data.

[0055] Step 200, upsampling the local sequence to the same sampling frequency as the received data; since the received data is not downsampled to 1 times the symbol rate after passing through the matched filter, it is necessary to upsample the local sequence to Same as the sampling fr...

Embodiment 2

[0079] Such as image 3 As shown, this embodiment proposes a frame synchronization system for a DVB-S2X system superframe, including:

[0080] The data preprocessing module is used to pass in the received data and calculate the total length of the received data and the length of the time interval;

[0081] An upsampling module, configured to upsample the local sequence to the same sampling frequency as the received data;

[0082] The sliding matching module is used to intercept the sequence from the received data, and record the interception starting position, and then obtain the peak matching result by block matching and accumulating summation between the intercepted sequence and the local sequence;

[0083] Threshold calculation module, used to calculate the peak threshold;

[0084] The threshold judgment module is used to judge according to the peak threshold and peak matching results, as well as the interception starting position and time interval length: when the peak m...

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Abstract

The invention provides a frame synchronization method and system of a DVB-S2X system superframe. The method comprises the following steps: calculating the total length of received data and the time interval length; performing up-sampling on a local sequence until the sampling frequency is the same as that of the received data; intercepting a sequence from the received data, recording an interception initial position, and carrying out block matching and accumulation summation on the intercepted sequence and a local sequence to obtain a peak value matching result; calculating a peak threshold value; judging according to the peak value threshold value, the peak value matching result, the interception initial position and the time interval length; and when the judgment result meets the requirement, starting from the interception starting position of the interception sequence in the received data, intercepting the sequence with the required super-frame length as the sequence after frame synchronization is completed. According to the method, the problem that the frame capturing probability of the ground terminal becomes low due to the conditions of large frequency offset and low signal-to-noise ratio during receiving of the ground terminal of the low-orbit satellite is solved through block matching.

Description

technical field [0001] The present invention relates to the technical field of satellite communication, in particular, to a frame synchronization method and system for a DVB-S2X system superframe. Background technique [0002] Satellites can be divided into communication satellites, remote sensing satellites, navigation satellites, and technology test satellites according to their uses. As of January 2019, the number of satellites in normal operation in orbit around the world is 2062. According to the different orbits of communication satellites, the satellite communication system can be divided into low orbit (LEO) satellite communication, medium orbit (MEO) satellite communication and high orbit (GEO) synchronous satellite communication. [0003] Due to the huge application value of low-orbit satellites in the fields of military affairs and the Internet of Things, and the limited frequency and orbital resources in the near space of the earth, according to the regulations ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2692
Inventor 卜智勇李昊
Owner 成都中科微信息技术研究院有限公司