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Electronic license plate reader and electronic license plate reverse link frequency acquisition method

A reverse link, electronic license plate technology, applied in the field of intelligent transportation, can solve the problem of difficulty in taking into account the accuracy and compatibility of synchronization, and achieve the effect of taking into account accuracy and improving reliability

Active Publication Date: 2020-12-29
SHENZHEN GENVICT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a reverse link frequency capture method for an electronic license plate reader and electronic license plate in view of the defects of the prior art that it is difficult to balance the accuracy of synchronization and the compatibility of the deviation range

Method used

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  • Electronic license plate reader and electronic license plate reverse link frequency acquisition method
  • Electronic license plate reader and electronic license plate reverse link frequency acquisition method
  • Electronic license plate reader and electronic license plate reverse link frequency acquisition method

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Embodiment Construction

[0051] figure 1 It is a flowchart of Embodiment 1 of the reverse link frequency acquisition method of the electronic license plate of the present invention, and the reverse link frequency acquisition method of this embodiment includes the following steps:

[0052] Step S10. Send the return signal of the electronic tag to at least two correlators respectively, the frequencies of the at least two correlators are different, and the frequency of one of the correlators is the reference frequency;

[0053] Step S20. Each correlator determines the correlation of the pilot sequence of the return signal itself, and judges whether a pilot symbol is detected according to the correlation;

[0054] Step S30. The correlator that detects the pilot symbol determines the corrected reverse link frequency according to the determined correlation of the pilot sequence.

[0055] In this embodiment, it should first be explained that the reference frequency refers to the reverse link frequency of the ...

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Abstract

The invention relates to an electronic license plate reader and a reverse link frequency acquisition method of the electronic license plate, The reverse link frequency acquisition method comprises thefollowing steps: step S10, respectively sending return signals of electronic tags into at least two correlators, wherein the frequencies of the at least two correlators are different, and the frequency of one correlator is a reference frequency; Step S20, each correlator determining the correlation of the pilot sequence of the return signal, and judging whether pilot symbols are detected according to the correlation; Step S30: detecting the correlator of pilot symbols and determineing the corrected reverse link frequency according to the determined correlation of the pilot sequences. The technical proposal of the invention can simultaneously give consideration to the accuracy of synchronization and the compatibility of the deviation range.

Description

technical field [0001] The invention relates to the field of Intelligent Transportation System (ITS for short), in particular to an electronic license plate reader and a reverse link frequency acquisition method of the electronic license plate. Background technique [0002] The electronic license plate is the electronic identification of the car, which is an electronic ID card that combines the ordinary license plate with UHF radio frequency identification technology (Radio Frequency Identification, referred to as RFID). As the basis of intelligent transportation, automotive electronic identification can help traffic control departments realize fine management of vehicles, guide the revolution of the intelligent transportation industry, and drive the upgrade of the comprehensive traffic management system. In addition, the electronic license plate is also one of the entrances to the Internet of Vehicles. Traffic big data obtained through electronic license plates will benefi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04L27/00H04W4/80
CPCH04L27/0014H04L2027/002H04W56/0035H04W4/80
Inventor 李微
Owner SHENZHEN GENVICT TECH
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