Mobile Device Speed Measurement via Pressure Sensor
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Solution Overview
Problem
Current methods for determining movement speed using GPS in mobile devices suffer from poor precision and unreliable results due to poor GPS signal quality and interference.
Innovation Solution
A method and device that utilize a pressure sensor to measure static and dynamic pressures in a pressure hole of a mobile device, calculating wind speed and relative movement speed based on pressure differences, and combining these with air density calculations to determine accurate movement speed, accounting for upwind and downwind conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS is used to test movement speed, then positioning function is provided, but measurement precision deteriorates due to poor GPS signal quality
Solution Approach 1:
The patent replaces the GPS electromagnetic signal-based speed measurement system with a pressure sensor-based mechanical measurement system. The pressure sensor measures air pressure changes caused by movement, converting mechanical motion into pressure variations that can be accurately measured and converted to speed values, thereby improving both reliability and precision.
Solution Approach 2:
The patent utilizes pneumatic principles by employing a pressure sensor to detect air pressure changes in the mobile device's cavity during movement. The movement of the device causes air pressure variations that are measured and correlated to speed, providing a reliable and precise measurement method independent of GPS signal quality.
2Ease of operation
If GPS is used to calculate movement speed, then positioning result is utilized, but calculation results become unreliable due to signal interference
Solution Approach 1:
The patent replaces the GPS-based electromagnetic calculation system with a pressure-based mechanical measurement system. The pressure sensor directly measures physical pressure changes during movement, providing reliable data that is converted to speed through established pressure-speed relationships, eliminating interference issues inherent in GPS signal processing.
Solution Approach 2:
The pressure sensor system is self-contained within the mobile device, using the device's own movement to generate measurable pressure changes. This self-service approach eliminates dependency on external GPS signals and provides reliable measurements that are inherently tied to the device's actual motion state.
3Measurement precision
If pressure sensor is used to measure movement speed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent leverages the mobile device's existing cavity structure as the measurement chamber for the pressure sensor, eliminating the need for separate housings or complex mounting structures. The pressure sensor integrates with the device's existing architecture, providing precise speed measurement without significantly increasing overall device complexity.
Solution Approach 2:
The mobile device's own movement generates the pressure changes that the sensor measures, eliminating the need for external test equipment or complex test setups. The device serves as both the test subject and the measurement instrument, simplifying the overall system while maintaining high precision.
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 enhances the precision and reliability of movement speed testing, eliminating external factor influences and providing accurate results, distinct from GPS-based methods.
Implementation Method 1
measuring a total pressure P of the wind in a static state; aligning the pressure hole to the wind direction in a moving process, and measuring a pressure Pm of the inner cavity of the pressure hole in a movement direction; obtaining a current wind speed vf according to a correspondence relationship between a wind speed vf and a dynamic pressure P−P0
Data Source
AI summary
A method for testing movement speed includes, but is not limited to: measuring a static pressure P0 of an inner cavity of a pressure hole of a mobile device (S100); aligning the pressure hole to a wind direction and measuring a total pressure P of the wind in a static state (S101); aligning the pressure hole to the wind direction in a moving process, and measuring a pressure Pm of the inner cavity of the pressure hole in a movement direction (S102); obtaining a current wind speed vf according to a correspondence relationship between a wind speed vf and a dynamic pressure P−P0; and obtaining a current relative movement speed vr according to a correspondence relationship between a relative movement speed vr and a pressure difference Pm−P0 (S103); and obtaining a current movement speed v according to the current relative movement speed vr and the current wind speed vf (S104).