Accelerometer Transform Calibration Using Gyroscope Tracking
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Solution Overview
Problem
Current methods for transform calibration of accelerometers in vehicle locators are time-consuming, require skilled personnel, and necessitate vehicle movement and remote verification, limiting local and efficient calibration.
Innovation Solution
A method and system for transform calibration of accelerometers during telematics device installation in a vehicle, utilizing a tri-axial rate gyroscope and computer to track and integrate angle changes, enabling local confirmation of successful calibration without requiring vehicle movement or remote verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current transform calibration method is used, then the accelerometer can be calibrated, but the process is time-consuming and requires vehicle movement
Solution Approach 1:
The patent performs transform calibration during the installation process itself, before the vehicle is driven. The installer places the device at a known alignment position, moves it to the final installation position, and completes calibration all during installation, eliminating the need for separate calibration trips.
Solution Approach 2:
The patent extracts the vehicle movement requirement from the calibration process. By using the device's own sensors and computational resources to calculate transformation matrices based on installer movement, it removes the need for driving the vehicle to perform calibration.
2Reliability
If the current transform calibration method is used, then calibration can be performed, but skilled personnel and remote verification are required
Solution Approach 1:
The patent makes the calibration process self-service by incorporating all necessary calibration functions directly into the telematics device. The device autonomously tracks its movement via gyroscope, calculates transformation matrices, and completes calibration without requiring external technicians or remote verification.
Solution Approach 2:
The patent implements immediate local feedback during calibration. The system provides real-time guidance to the installer about the device's position and orientation, and confirms when calibration is complete and successful, eliminating the need for post-calibration verification calls.
3Manufacturing precision
If the current transform calibration method is used, then the accelerometer can be calibrated, but the vehicle must be driven on a flat surface
Solution Approach 1:
The patent changes the reference frame parameters from requiring a flat surface reference to using the device's initial known alignment position as the reference. By measuring angle changes relative to this initial position using the gyroscope, the system eliminates the requirement for a flat surface while maintaining calibration 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
Simplifies the calibration process by allowing local, efficient transform calibration of accelerometers during installation, eliminating the need for vehicle movement and remote verification, and providing immediate feedback on calibration success.
Implementation Method 1
employing a tri-axial rate gyroscope in the telematics device to track and integrate the angle changes of the moving telematics device
Data Source
AI summary
A method for performing transform calibration of an accelerometer of a telematics device during installation in a vehicle includes placing the device in the vehicle at an initial position having a known alignment with a given frame of reference of the vehicle, moving the telematics device from the initial position to a final installation position in the vehicle with a tri-axial rate gyroscope of the device concurrently tracking and integrating the angle changes to provide a set of coordinates of the final installation position, and transform calibrating the accelerometer of the device using the set of coordinates so as to leave the device installed at the final position with its accelerometer transform calibrated with respect to the given frame of reference.