Accelerometer combined LED indoor 3D positioning method

A technology of accelerometer and positioning method, which is applied in the field of indoor positioning and navigation, and can solve problems such as low positioning accuracy, inability to ensure horizontal placement of the receiver, tilting or shaking of the handheld device, etc.

Inactive Publication Date: 2017-02-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, in the actual positioning and navigation process, the handheld device will tilt or shake at a certain angle, which cannot ensure that the receiver is always placed horizontally
In summary, these algorithms will lead to large positioning errors in practical applications, and the positioning errors can reach decimeter level, meter level or even ten meter level, and the positioning accuracy is low

Method used

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  • Accelerometer combined LED indoor 3D positioning method
  • Accelerometer combined LED indoor 3D positioning method
  • Accelerometer combined LED indoor 3D positioning method

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Embodiment Construction

[0067] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, and the content of the present invention is not limited to the following embodiments.

[0068] The present invention can use N LED lights to realize positioning. When N is 1 or 2, it can only be located within a certain range, and the positioning accuracy is low; when N is 3, the coordinate position of the user can be accurately calculated, but when a certain When a lamp fails, the positioning accuracy cannot be guaranteed; when N is 4, it can not only realize accurate positioning for the user, but also ensure normal positioning when the LED lamp fails, so N=4 is recommended, that is, the positioning unit is 4 LED lamps are distributed in a square, and the LED lamp array is expanded on all sides. The indoor lighting system is a palace grid unit topology network composed of more than one LED lamp array extended by 2 rows and 2 columns. The LED lamps locat...

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Abstract

The invention discloses an accelerometer combined LED indoor 3D positioning method. LED lights are used as emitters and send ID codes with their position information. A mobile terminal is used as a receiver. In this method, the receiving power intensity technology in triangulation method is used and at the same time, the confidence interval algorithm is combined to realize 3D positioning. While considering the rotation angles into the positioning method, the receiver with accelerometer is used to receive the emitted light from the LED lights and capture their receiving power. Through the angle information of the accelerometer, the normal directions of the receiver under different rotation angles can be obtained. A detailed calculation algorithm for incident angles is introduced so as to quantize the rotation angle of a handheld device as an incident angle finally. The Z coordinate of the receiver is introduced, and the positioning error is controlled in a set scope through the two-layer iteration. At the same time, the change of the Z coordinate of the receiver is not more than 5cm, so as to overcome the influence of the upper and lower jitter on the positioning error and provide higher positioning accuracy. The positioning accuracy can be increased from meter grade or decimeter grade to centimeter grade.

Description

technical field [0001] The invention provides an LED indoor 3D positioning method combined with an accelerometer, belonging to the technical field of indoor positioning and navigation. Background technique [0002] Location-Based Service (LBS) is to determine the actual geographic location of mobile users through the cooperation of mobile terminals and wireless networks, so as to provide location-related information services that users need. It has become a must in people's daily life in today's society. an essential part. Global Satellite Positioning (GPS) is currently the most widely used positioning system, but satellite signals cannot penetrate buildings, and there are serious multipath and non-line-of-sight interferences in the indoor environment, making it difficult to achieve positioning indoors. In order to improve the accuracy of indoor positioning, people use infrared positioning, ultrasonic positioning, radio frequency identification (Radio Frequency Identificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/16G01C21/20
CPCG01C21/206G01S5/16
Inventor 王瑾黎好栩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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