Anti-bit slide protective frame synchronization method

A frame synchronization and bit sliding technology, applied in synchronization devices, digital transmission systems, electrical components, etc., can solve problems such as frame synchronization tracking failure, avoid interruption of frame synchronization tracking process, improve adaptability, and stabilize frame synchronization tracking. Effect

Active Publication Date: 2016-09-21
10TH RES INST OF CETC
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of frame synchronization tracking interruption caused by bit slip in the process of receiving remote sensing signals in the existing frame synchronization method, and to provide a method that can avoid bit slip frame synchronization

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  • Anti-bit slide protective frame synchronization method

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Embodiment Construction

[0014] refer to figure 1 . According to the present invention, frame synchronization against bit slipping can be realized by the following steps:

[0015] 1) First, the demodulated data is delayed by 1 bit, 2 bits, 3 bits, 4 bits, 5 bits, and 6 bits through the data delay module, and then the original demodulated data and the delayed demodulated data are sent to 7 The frame synchronization word correlation module performs correlation calculation, and regards the corresponding path of the data delay module 3 as the main path; correlates the main path signal and the multi-channel lead and lag signals with the frame sync word, and obtains the correlation result of the multi-channel signal, Then adjust the next detection position according to the position where the relevant result exceeding the preset threshold appears;

[0016] 2) In the frame synchronization establishment stage, only the frame synchronization word correlation results of the main channel are detected, and when ...

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Abstract

The invention provides an anti-bit slide frame synchronization method. Through utilization of the method, the problem that frame synchronization tracking is failed due to bit slide of remote sensing signals can be remarkably improved. The method is realized through the technical scheme of carrying out n-bit delay on demodulation data through data delay modules, sending the demodulation data and the delayed demodulation data to multi-way frame synchronization word correlation modules for correlation calculation, and regarding accesses corresponding to n/2 of the data delay modules as master accesses; correlating master access signals and multi-way advanced signals and lagged signals with synchronization words, thereby obtaining correlation results of multi-way signals, adjusting detection positions of a next time according to the appearing positions of the correlation results exceeding a preset threshold; detecting frame synchronization correlation results of all parallel ways by taking a frame length as an interval after frame synchronization is established; and determining whether there is bit slide or not according to whether the correlation results appear in the master accesses or not.

Description

technical field [0001] The invention relates to a frame synchronization method that can be widely used in many fields such as meteorology, ocean, resources, environment, remote sensing and reconnaissance. It is mainly used to solve the problem of frequent interruption of the frame synchronization tracking process due to bit slippage during the process of receiving remote sensing satellite signals. A frame synchronization method that resists bit-slips causing the problem of received data loss. Background technique [0002] The most basic synchronization method in data communication is "bit synchronization" (bit synchronization) or bit synchronization. Bit is the smallest unit of data transmission. Bit synchronization means that the clock at the receiving end has been adjusted to be exactly the same as the clock at the sending end, so after the receiving end receives the bit stream, it can make a judgment in the middle of each bit. The purpose of bit synchronization is to co...

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Application Information

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IPC IPC(8): H04J3/06H04L7/00
CPCH04J3/0608H04L7/0041
Inventor 张波方科兰霞
Owner 10TH RES INST OF CETC
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