Enhanced camera-assisted positioning method based on received signal strength ratio

A technology of received signal strength and positioning method, applied in the field of wireless communication, can solve problems such as increasing the complexity of CA-RSSR

Active Publication Date: 2020-07-14
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0009] However, the RSSR method still has the following three limitations: 1) The RSSR method requires providing 4 LEDs and 5 LEDs within the field of view (Field of View, FoV) of t

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  • Enhanced camera-assisted positioning method based on received signal strength ratio
  • Enhanced camera-assisted positioning method based on received signal strength ratio
  • Enhanced camera-assisted positioning method based on received signal strength ratio

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Embodiment Construction

[0086] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0087] An enhanced camera-assisted positioning method based on received signal strength ratio (Enhanced CameraAssisted Received Signal Strength Ratio, eCA-RSSR)

[0088] Such as figure 1 As shown, the specific steps of the positioning method are as follows:

[0089] Step 1. Construct a scene including K transmitters and a receiver to be positioned, and use four coordinate systems for positioning;

[0090] K LEDs are mounted as transmitters on the ceiling, and the receiver consists of a photodiode PD and a standard pinhole camera in close proximity to each other; without loss of generality, the LEDs are assumed to be vertically downward.

[0091] Such as figure 2 As shown, the four coordinate systems for positioning include: 2D Pixel Coordinate System (Pixel Coordinate System, PCS) o p -u p v p , 2D imaging plane coordinate system (Image Coordinate System, ICS)...

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Abstract

The invention discloses an enhanced camera-assisted positioning method based on a received signal strength ratio, and belongs to the technical field of wireless communication. The method comprises thefollowing steps: firstly, constructing a scene comprising K transmitters and a to-be-positioned receiver, and positioning by using four coordinate systems; obtaining the optical power received by thePD from each LED by using the channel direct-current gain between each LED and the PD, and simplifying the optical power; then respectively calculating an incident angle of each LED under a 3D cameracoordinate system; calculating the distance ratio between the receiver and each LED by using the optical power and the incident angle corresponding to each LED, and calculating the distance between the receiver and each LED by using the included angle between the two LEDs and the receiver according to the cosine law; finally, for the deployment of only three LEDs, performing 2D position estimation and 3D position estimation according to a linear least square method to obtain the position coordinates of the receiver. The method has the advantages of high coverage rate, low complexity and highpositioning precision.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an enhanced camera-assisted positioning method based on received signal strength ratio. Background technique [0002] Recently, indoor and outdoor localization and navigation have received more and more attention. In outdoor scenes, the satellite-based Global Positioning System (Global Positioning System, GPS) has been widely used, but due to the occlusion of buildings, the GPS signal is weak in indoor scenes, resulting in unsatisfactory positioning accuracy. [0003] Applications based on indoor positioning such as existing literature 1: H.Liu, H.Darabi, P.Banerjee, and J.Liu, "Survey of wireless indoor positioning techniques and systems," IEEETrans.Syst.Man Cybern.C:Applications and Reviews, vol.37, no.6, pp.1067–1080, Nov.2007, introduce reliable localization techniques for indoor environments. Among them, the most popular are WiFi-based positionin...

Claims

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Application Information

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IPC IPC(8): G01S5/16
CPCG01S5/16
Inventor 杨洋柏琳冯春燕李承阳郭彩丽
Owner BEIJING UNIV OF POSTS & TELECOMM
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