Portable Device Sensor Fusion for Battery Conservation
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Solution Overview
Problem
Current portable electronic devices consume excessive battery life when using GPS sensors to determine movement and location, especially when moving slowly or being stationary, as these sensors remain active regardless of the device's state, leading to inefficient power usage.
Innovation Solution
A method and system that utilize a first sensor, such as an accelerometer, to detect movement exceeding a threshold level, activating a second sensor, like a GPS sensor, only when necessary to determine velocity, position, and time coordinates, and deactivating it when movement reduces below the threshold, thereby conserving battery life by minimizing unnecessary GPS usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS sensor is continuously activated to determine accurate location and movement, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The GPS sensor is activated periodically based on detected movement patterns rather than continuously. The system uses accelerometer data to identify periods when the device is in motion and activates GPS only during those periods, creating a periodic activation pattern that reduces energy consumption while maintaining location tracking accuracy during relevant intervals.
Solution Approach 2:
The system performs preliminary detection using the accelerometer sensor to identify movement patterns before activating the GPS sensor. This preliminary action allows the system to anticipate when GPS activation will be necessary, enabling proactive power management by keeping GPS in a low-power state until movement is detected and then activating it only when needed.
2Duration of action of stationary object
If GPS sensor remains activated during stationary periods, then location recording continuity is improved, but loss of energy increases
Solution Approach 1:
The system implements periodic activation of the GPS sensor based on movement detection cycles. During stationary periods, the GPS remains inactive while the accelerometer continues to monitor for movement. This periodic approach maintains location recording continuity by activating GPS at regular intervals when movement is detected, rather than maintaining continuous operation during stationary phases.
Solution Approach 2:
The system extracts and separates the movement detection function (performed by accelerometer) from the location recording function (performed by GPS). By taking out the GPS sensor from continuous operation and only activating it when the accelerometer detects movement exceeding a threshold, the system maintains location recording continuity during motion while eliminating unnecessary energy consumption during stationary periods.
3Measurement precision
If multiple sensors are used in combination to accurately determine movement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the sensor functions into two distinct roles: the accelerometer handles movement detection and threshold comparison, while the GPS sensor handles location and velocity determination. This segmentation allows each sensor to operate independently in its optimal mode, with the accelerometer continuously monitoring movement and triggering GPS activation only when necessary, thereby maintaining measurement precision while reducing overall system complexity.
Solution Approach 2:
The accelerometer serves as an intermediary sensor that mediates between the device's movement state and the GPS sensor activation. Rather than having the GPS sensor operate autonomously or in direct combination with other sensors, the accelerometer acts as an intermediary that processes movement data and controls GPS activation based on detected movement patterns, simplifying the sensor system architecture while maintaining accurate movement detection.
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 reduces battery consumption by activating GPS sensors only when movement exceeds a predefined speed and time threshold, ensuring accurate location recording while minimizing power usage, especially in stationary or slow-moving conditions.
Implementation Method 1
An accelerometer sensor may sense a linear motion, for example, a translation in any plane, such as a local horizontal plane. The accelerometer may also be used to sense the direction of gravity to estimate an object's roll and pitch.
Implementation Method 2
The GPS sensor may use signals from earth-orbiting navigation satellites to ascertain the portable electronic device's location. A global positioning system receiver in the portable electronic device may gather signals from the navigation satellites.
Data Source
AI summary
The present disclosure generally relates to recording movement of a portable electronic device, and more particularly, to a portable electronic device and methods for recording mobility of the portable electronic device. In one embodiment, a method for recording a mobility of a portable electronic device is disclosed, comprising detecting a movement of the portable electronic device using a first sensor; when the movement exceeds a threshold level, determining velocity, a position coordinate, and a time coordinate of the portable electronic device using a second sensor, wherein the threshold level indicates a pre-configured speed and a pre-configured time period associated with the movement; and recording one or more values corresponding to the determined velocity, the position coordinate, and the time coordinate, the one or more values representing mobility of the portable electronic device.