Barometric Floor Detection Using Pressure Offset Calibration
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Solution Overview
Problem
Current geolocation technologies, such as GPS, face inaccuracies in determining altitude and are unreliable indoors, where multiple floors can be misidentified due to limited precision, especially in buildings with multiple levels.
Innovation Solution
Employing barometric air pressure sensors in client devices to calibrate and determine the current floor level by calculating a pressure offset between indoor and outdoor air pressure readings, allowing for accurate floor identification and mapping within multilevel locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS is used to determine device location and altitude, then the device can receive satellite signals outdoors, but the altitude accuracy is only about 10 meters and GPS does not function well indoors
Solution Approach 1:
The system segments the location determination process into two distinct phases: outdoor GPS-based location acquisition and indoor barometric pressure-based floor detection. This segmentation allows each method to operate in its optimal environment, with GPS providing reliable outdoor positioning and barometric sensors providing precise indoor floor identification.
Solution Approach 2:
Barometric pressure data serves as an intermediary between GPS satellite signals (which cannot penetrate buildings) and indoor location services. The pressure sensor acts as a mediator that translates pressure changes into floor level information, enabling continuous location tracking when GPS signals are unavailable indoors.
2Reliability
If wireless access points or cell tower multilateration is used to provide indoor location, then the service can determine device location indoors, but the accuracy is only about 10 meters which can span three floors
Solution Approach 1:
The system replaces wireless signal-based positioning (WiFi multilateration) with barometric pressure-based altitude measurement. This substitution leverages the physical principle that atmospheric pressure decreases predictably with altitude, providing a more direct and accurate method for determining floor level compared to signal triangulation methods.
Solution Approach 2:
The system changes the measurement parameter from wireless signal strength (which has limited resolution for vertical positioning) to barometric pressure (which provides continuous, high-resolution altitude data). This parameter change enables precise floor level detection by measuring pressure differences corresponding to vertical elevation changes between floors.
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
Enhances indoor geolocation accuracy by enabling precise floor detection in buildings and other multilevel environments, improving navigation and service delivery, such as routing and emergency response, while ensuring user control over data privacy.
Implementation Method 1
barometric air pressure sensors in a client device
Data Source
AI summary
Aspects of the present disclosure provide techniques for determining floors at a geographic location using barometric air pressure sensors in a mobile phone. An exemplary method includes identifying a first height associated with a location based on a client device. The first height indicates an entry level of the client device at the location. Using information regarding an amount of outside air pressure at the location, a pressure sensor in the client device is calibrated. A pressure offset for the location is calculated. The pressure offset identifies a difference between air pressure readings inside the location and the amount of outside air pressure at the location. Using the calibrated pressure sensor, a second height associated with the location is determined based on readings from the calibrated pressure sensor and the pressure offset. The second height indicates a different level at the location that the client device is currently on.