Self-Identifying LED Modulation for Indoor Positioning
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Solution Overview
Problem
Existing indoor positioning systems face challenges in achieving accurate location determination within indoor environments due to the limitations of GPS and other wireless signal-based methods, which are affected by construction materials and multi-path propagation effects, and optical signals are hindered by alignment issues.
Innovation Solution
A system utilizing self-identifying light sources, such as LED light sources, that modulate visible light to transmit identification codes, including location information, using techniques like Digital Pulse Recognition (DPR) modulation, allowing mobile devices to determine their position through photogrammetric processing of multiple light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate light sources are used for different wavelengths, then spectral coverage is improved, but device complexity increases
Solution Approach 1:
The single light source is segmented into multiple independently controllable spectral regions (blue, cyan, green, yellow, orange, red) that can be activated selectively to cover different spectral ranges, achieving multi-wavelength capability without requiring multiple physical light sources
Solution Approach 2:
A single light source structure is designed to perform multiple functions by emitting across the entire visible spectrum (380-780 nm) and allowing selective activation of different spectral regions, replacing what would traditionally require multiple specialized light sources
2Measurement precision
If modulation depth is increased for self-identification, then detection accuracy is improved, but light intensity varies affecting measurement stability
Solution Approach 1:
The system incorporates feedback mechanisms where the modulated light signal is detected and processed to generate identification information, allowing the system to adjust and maintain optimal modulation depth while compensating for intensity variations through continuous monitoring and adjustment
Solution Approach 2:
The patent employs wavelength modulation as a parameter change strategy, where different spectral regions are modulated at different frequencies or depths, allowing the system to achieve high detection accuracy through spectral differentiation rather than relying solely on intensity modulation
3Adaptability or versatility
If multiple light sources are combined, then spectral coverage is improved, but alignment precision becomes more difficult to maintain
Solution Approach 1:
Multiple spectral regions are combined within a single light source structure rather than using separate physical light sources, eliminating alignment issues between multiple sources while maintaining full spectral coverage through integrated emission
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 provides precise indoor positioning with high accuracy, enabling location-aware applications and content delivery with minimal user input, leveraging the directional nature of light signals and advanced image processing techniques.
Implementation Method 1
a light source, which emits light having a wavelength between 380 nm and 780 nm and has independently controllable spectral regions
Data Source
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AI summary
In one aspect, the present disclosure relates to a self identifying light source including an emitter that produces visible light; and an autonomous modulator in electrical communication with the emitter that automatically and continually modulates the visible light produced by the emitter, wherein the modulated visible light represents an identification code of the light source. In some embodiments, the emitter is a light emitting diode (LED) and further comprising an LED driver that provides a specified voltage and current to each LED in the light source.