Asynchronous visible light positioning method

A positioning method and visible light technology, applied in positioning, transmission system, free space transmission, etc., can solve the problems of high complexity of positioning algorithm and excessive frequency resource occupation

Active Publication Date: 2019-03-29
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the shortcomings of the existing technology that occupy too many frequency resources and the complexity of the positioning algorithm is high, the present invention provides an asynchronous visible light positioning method

Method used

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  • Asynchronous visible light positioning method

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Experimental program
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Embodiment 1

[0069] Such as figure 1 As shown, an asynchronous visible light positioning method includes the following steps:

[0070] Step S1: Establish a BCAM mechanism, and use the BCAM mechanism to encode and modulate the LED-ID information. Since M adjacent LED lamps use M different non-zero carrier frequencies f i (i=1,2,...,M) FSOOK symbols and M' frequency f i The auxiliary symbols of '(i'=1,2,..,M') modulate the LED-ID signal, where f i '≠f i and 1≤M'≤M, multiple adjacent LED lamps can share a frequency for modulating auxiliary symbols, or use different auxiliary symbol frequencies. The specific steps are:

[0071] Step 1: Encode the binary LED-ID information using the coding idea of ​​bi-phase code. The original bit information "0" is represented by "01", and "1" is represented by "10", that is, each unit bit is represented by double bits ;

[0072] Step 2: Add FH code to the encoded binary LED-ID information. This FH code is composed of more than or equal to 3 consecutive b...

Embodiment 2

[0115] figure 2 An embodiment of a BCAM mechanism is provided. Assuming that a 4-digit LED-ID information code "0110" is transmitted, after encoding by the pseudo-biphase code, the information code becomes "01101001", and then the FH code "1110" is added to the encoded binary LED-ID information. The number of consecutive "0" and "1" in the ID information after pseudo-biphase encoding will not exceed two, so FH "1110" is unique in the LED-ID information; finally, perform FSOOK alternate modulation on the binary sequence , the specific method is to use the information bit "1" with a duration of T F frequency is f C The FSOOK symbol is represented, while the information bit "0" is represented by a duration of T F The direct current (zero frequency) symbol representation.

[0116] image 3 It shows how the present invention performs multi-window detection. Under the BCAM mechanism, only 1 to 4 consecutive identical symbols will appear in the system. In order to ensure the u...

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Abstract

The invention relates to an asynchronous visible light positioning method. According to the invention, only a single-frequency signal or a periodic signal of two frequencies is required for each path.Compared with an existing IVLP scheme, frequency resources can be effectively saved. After the original LED-ID information is coded and modulated by a BCAM, the number of continuous identical symbolsis not more than two. In this way, the complexity of the symbol mapping problem can be effectively reduced, and the algorithm complexity is reduced. Furthermore, a signal transmission function (RSTF)-assisted WCL accurate positioning algorithm is adopted for rapidly obtaining the coordinates of a positioning terminal. The method is low in operation complexity. The defects that in the prior art, the amount of occupied frequency resources is too large and the complexity of the positioning algorithm is high can be overcome.

Description

technical field [0001] The present invention relates to the technical field of visible light positioning, and more specifically, to an asynchronous visible light positioning method. Background technique [0002] literature [1] A multi-frame image asynchronous imaging visible light positioning (Imaging Visible LightPositioning, iVLP) system model is proposed, which solves the problem of using a CMOS image sensor (CMOS Image Sensor, CIS) to asynchronously receive LED-ID information. Specifically, the transmitter (LED downlight) cyclically transmits LED-ID information composed of multiple FSOOK symbols, and the receiver (camera) uses an asynchronous frame equidistant oversampling mechanism to receive FSOOK signals. Further, literature [ 1] It is discussed that if the two parameters α and β in the asynchronous oversampling mechanism are not selected properly, when dealing with multiple consecutive identical FSOOK symbols, due to the number of FSOOK symbols K CI and the number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/16H04B10/116H04B10/556
CPCH04B10/116H04B10/5563G01S5/16
Inventor 江明李正鹏刘名袁剑丰
Owner SUN YAT SEN UNIV
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