Digital Pulse Recognition Tone Isolation in Indoor Positioning
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Solution Overview
Problem
Existing indoor positioning systems face challenges in accuracy due to the limitations of GPS in indoor environments and the unpredictability of radio wave propagation in complex indoor settings, necessitating a more reliable method for precise location determination.
Innovation Solution
A light-based positioning system utilizing modulated LED light sources that transmit identification codes through digital pulse recognition (DPR) modulation, allowing mobile devices to determine their position by receiving and demodulating these signals, which can then be used to access location-specific content and databases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS is used for indoor positioning, then outdoor positioning accuracy is maintained, but indoor positioning accuracy deteriorates due to signal blockage
Solution Approach 1:
The patent replaces radio frequency-based GPS positioning with an optical-based positioning system using visible light sources and photodetectors. This substitution enables accurate indoor positioning by using light propagation characteristics instead of electromagnetic waves, solving the signal blockage problem in indoor environments while maintaining positioning reliability.
Solution Approach 2:
The patent introduces light sources and photodetectors as intermediary components to enable positioning. The light sources emit optical signals that carry positioning information, and photodetectors receive these signals, creating a reliable indoor positioning mechanism that overcomes GPS limitations without requiring direct satellite signal penetration.
2Ease of operation
If radio wave propagation is used for indoor positioning, then wireless communication is achieved, but positioning accuracy deteriorates due to unpredictable propagation in complex indoor settings
Solution Approach 1:
The patent substitutes radio wave propagation with optical signal propagation for positioning purposes. Visible light provides more predictable and controllable propagation characteristics in indoor environments compared to radio waves, enabling precise positioning while maintaining wireless communication capabilities through the same optical channel.
3Measurement precision
If modulated light signals are used for positioning, then positioning precision is improved, but signal detection difficulty increases due to modulation frequency
Solution Approach 1:
The patent employs feedback mechanisms in the form of modulated light signals that carry encoded positioning information. The modulation allows the system to embed multiple pieces of information (position, identity, status) in the light signals, and the photodetector system with signal processing capabilities provides feedback to accurately detect and decode these modulated signals, overcoming detection difficulties.
Solution Approach 2:
The patent uses periodic modulation of light signals at specific frequencies to encode positioning information. This periodic action allows the photodetector system to use frequency-based detection methods, making it easier to distinguish modulated signals from ambient light and improve detection accuracy despite the complexity introduced by modulation.
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 system provides accurate three-dimensional positioning with high precision, enabling effective indoor navigation and content delivery by leveraging the directional nature of optical signals and the ability of CMOS image sensors to detect modulated light frequencies.
Implementation Method 1
beacon light source to transmit identification information to the mobile device. The beacon light source may be a visible light source or an infrared light source
Implementation Method 2
the ability of CMOS image sensors to detect modulated light frequencies
Data Source
AI summary
In one aspect, the present disclosure relates to a method for isolating a broadcast digital pulse recognition tone of a beacon light source in a digital video sequence. In some embodiments, the method includes receiving a digital video sequence of a scene, the digital video sequence including a sequence of frames and the scene including both modulated illumination broadcast by a beacon light source and un-modulated illumination, calculating a background value of the digital video sequence, the background value including a portion of the digital video sequence corresponding to the un-modulated illumination of the scene, subtracting the background value of the digital video sequence to obtain an isolated digital video sequence of the modulated illumination of the scene, calculating a frequency content of a frame of the isolated digital video sequence, and determining a particular tone broadcast by the beacon light source based on the frequency content.