Visible Light Positioning Receiver Using Imaging and Non-Imaging Detectors
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Solution Overview
Problem
Current Visible Light Positioning (VLP) systems face inaccuracies in determining spatial position indoors due to limitations in both camera-based and photodiode-based receivers, with camera-based systems unable to decode high-frequency signals and photodiode-based systems providing insufficient accuracy.
Innovation Solution
A two-stage positioning method combining an imaging receiver for capturing images of luminaires and a non-imaging Quadrant Photodiode Angular Diversity Aperture (QADA) receiver for estimating the angle of arrival (AOA) of light signals, allowing for accurate spatial position determination by matching AOA information with reference point positional information from the imaging receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a camera-based imaging receiver is used to capture images of luminaires, then the system can obtain visual information about luminaire positions, but it cannot decode high-frequency modulated light signals to identify individual luminaires
Solution Approach 1:
The system divides the receiving function into two separate receivers: a camera for capturing visual information about luminaire positions and a photodiode array for decoding high-frequency modulated signals. Each receiver is optimized for its specific function, and the results are combined to achieve both signal identification and accurate positioning.
Solution Approach 2:
The system merges the outputs from two distinct receivers (camera and photodiode array) by combining the visual position information from the camera with the signal decoding information from the photodiode array. This integration allows the system to achieve both functions simultaneously that neither receiver could accomplish alone.
2Measurement precision
If a photodiode array receiver is used to decode high-frequency light signals, then the system can identify individual luminaires, but it cannot provide sufficiently accurate spatial positioning information
Solution Approach 1:
The system separates the functions of signal decoding and spatial positioning into two different receivers. The photodiode array is dedicated to decoding high-frequency signals for luminaire identification, while the camera captures visual information for spatial positioning. This segmentation allows each component to excel at its specific task.
Solution Approach 2:
The system combines the strength of the photodiode array in signal identification with the strength of the camera in spatial positioning. By merging the decoded signal information with the visual position data, the system achieves both accurate luminaire identification and precise spatial positioning.
3Measurement precision
If a dual receiver system (camera and photodiode array) is used to improve positioning accuracy, then both signal decoding and position capture are achieved, but the system complexity increases
Solution Approach 1:
The system uses two receivers, each with a specialized function that complements the other. The camera provides visual positioning information while the photodiode array provides signal decoding capability. Together, they create a multi-functional system that achieves accurate positioning without requiring a single complex receiver to perform all functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the accuracy of spatial position determination within indoor environments by leveraging the strengths of both imaging and non-imaging receivers, providing a more precise location tracking compared to existing VLP systems.
Implementation Method 1
a non-imaging receiver for estimating an angle of arrival (AOA) of light from each said modulated light source
Implementation Method 2
an imaging receiver for capturing an image of the luminaires and associated said reference point(s)
Data Source
AI summary
A visible light positioning receiver arrangement for obtaining spatial position information of the receiver arrangement from a plurality of luminaires (5), at least one of the luminaires including at least one associated modulated light source for transmitting a light signal providing positional information of one or more reference points associated with the luminaire, said receiver arrangement including: an imaging receiver for capturing an image of the luminaires and associated said reference point(s); and a non-imaging receiver (7) for estimating an angle of arrival (AOA) of light from each said modulated light source, and for decoding the reference point positional information therefrom; wherein said AOA information and reference point positional information from the non-imaging receiver is matched to the image captured by the imaging receiver to obtain said spatial position information.