A Frame Synchronization Method Against Sliding

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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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 tracking interruption and loss of received data, and can adapt to a wide range Bit slipping, and can significantly improve the frame synchronization tracking failure caused by bit slipping in the remote sensing signal reception process, the anti-slip frame bit slipping frame synchronization method

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