Fireman Positioning via Radio Wave Phase Difference
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Solution Overview
Problem
Firefighters face challenges in determining their location within a burning building due to the absence of electricity and smoke, which renders GPS and iBeacon systems ineffective.
Innovation Solution
A fireman positioning system utilizing multiple radio wave emitting devices emitting frequency modulated signals at different frequencies, and a position receiving device worn by the firefighter to determine a three-dimensional location through phase difference detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If GPS is used for positioning, then positioning function is provided in opened space, but it cannot be applied in indoor space
Solution Approach 1:
The patent introduces radio wave emitting devices as intermediary components deployed throughout the indoor space to mediate positioning. These devices emit radio waves that enable the receiving device to calculate position through phase difference measurements, bridging the gap between outdoor GPS functionality and indoor positioning requirements without relying on satellite signals
2Adaptability or versatility
If iBeacon positioning project is used, then indoor positioning is enabled, but the signal emitter stops operation when there is no electricity
Solution Approach 1:
The patent changes the operational parameters of the positioning system by using radio wave emission instead of electric signal transmission. The radio wave emitting devices can operate without electrical power from the building's infrastructure, maintaining positioning availability in environments where electricity is unavailable during fire incidents
3Measurement precision
If multiple radio wave emitting devices with different frequencies are used, then three-dimensional location determination is enabled, but device complexity increases
Solution Approach 1:
The patent segments the positioning system into multiple independent radio wave emitting devices, each operating at different frequencies. This segmentation allows the receiving device to process phase differences from multiple frequency sources to calculate three-dimensional location, achieving high measurement precision while maintaining modular system architecture that manages complexity through standardization
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
Enables firefighters to accurately determine their location at a fire scene, even in indoor spaces without electricity, using phase differences from multiple radio wave signals, enhancing safety and navigation.
Implementation Method 1
a first radio wave emitting device and a second radio wave emitting device, spaced with a predetermined distance and utilized for correspondingly emitting a first frequency modulated signal and a second frequency modulated signal
Implementation Method 2
a phase difference is formed between the first output signal and the second output signal, and the position receiving device is served to determine a direction angle of the fireman relative to the two radio wave emitting devices via the phase difference
Data Source
AI summary
A fireman positioning system includes: a first radio wave emitting device and a second radio wave emitting device, spaced with a predetermined distance and utilized for correspondingly emitting a first frequency modulated signal and a second frequency modulated signal; and a position receiving device, carried or worn by a fireman, and utilized for receiving the first frequency modulating signal and the second frequency modulating signal, and can demodulate the first frequency modulated signal via a first carrier signal so as to obtain a first output signal, and demodulate the second frequency modulated signal via a second carrier signal so as to obtain a second output signal, wherein a phase difference is formed between the first output signal and the second output signal, and the position receiving device can determine a direction angle of the fireman relative to the two radio wave emitting devices via the phase difference.