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Clock synchronization method and system of LED visible light indoor locating

A clock synchronization and indoor positioning technology, which is applied in time division multiplexing system, positioning, distribution line transmission system, etc., can solve the problems of high investment, inability to meet the accuracy of LED visible light indoor positioning, and difficulty in realization

Inactive Publication Date: 2017-09-22
吕志勤
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Problems solved by technology

[0006] In the existing technology, although the GPS method can obtain ns-level clock synchronization error, it is difficult to realize because of the high investment; the mature NTP method can only obtain ms-level clock synchronization error, which cannot meet the requirement of LED visible light indoor positioning accuracy ≤ 0.5 meters

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  • Clock synchronization method and system of LED visible light indoor locating
  • Clock synchronization method and system of LED visible light indoor locating
  • Clock synchronization method and system of LED visible light indoor locating

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Embodiment Construction

[0043] Based on the analysis of the particularity of the clock synchronization application environment of LED visible light indoor positioning, and in combination with different clock synchronization technologies, the present invention determines a design scheme of a clock synchronization method and system for LED visible light indoor positioning.

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] An embodiment of the present invention provides a clock synchronization method for LED visible light indoor positioning.

[0046] This method selects the clock source unit as the reference clock, and the local clock of the transmitter corresponding to each LED lamp is the slave clock, forming a single-hop static topology master-slave local area network. The clock source unit obtains the ...

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Abstract

The invention discloses a clock synchronization method and system for indoor positioning of LED visible light. The method and the system select a clock source as the GPS timing reference, and the clock source uses power carrier technology to send packets including The timing information of the current time stamp, the transmitter corresponding to each LED lamp receives the timing information through the power line, and calculates the time offset value and frequency compensation value between its local time and the current time stamp of the clock source, after Nsqu times of phase synchronization and frequency synchronization , so that the time offset value of its local clock gradually decreases towards zero, and it is processed according to the sliding time window mechanism. The invention realizes that the clock synchronization error of LED visible light indoor positioning is controlled within the range of ns level.

Description

technical field [0001] The invention belongs to the technical field of clock synchronization of an ad hoc communication local area network, and in particular relates to a clock synchronization method and system for LED visible light indoor positioning. Background technique [0002] The indoor positioning accuracy of LED visible light is much higher than that of Bluetooth, Wi-Fi, infrared, ultrasonic and other indoor positioning accuracy using radio frequency technology. LED visible light indoor positioning uses the length of light transmission time to determine the position coordinates of the measured object to ensure that the indoor positioning accuracy is ≤0.5 meters. The clock synchronization error is the most important factor affecting the length of light transmission time, that is, the indoor positioning accuracy. The higher the positioning accuracy requirements, the higher the positioning accuracy. The clock synchronization error is smaller. [0003] The LED visible l...

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Application Information

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IPC IPC(8): H04J3/06H04B3/54G01S5/16
CPCH04J3/0638G01S5/16H04B3/54H04J3/0617H04J3/0682
Inventor 吕志勤
Owner 吕志勤
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