Composite Sensor Offset Correction via Segmented Signal Averaging
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Solution Overview
Problem
Existing composite sensors for measuring angular velocity and acceleration have insufficient accuracy in offset correction, particularly due to noise and errors caused by static and dynamic offsets during still and moving states.
Innovation Solution
A composite sensor design incorporating multiple angular velocity and acceleration detection elements, along with a control circuit that includes averaging units, a decision processor, and correction modules to calculate and apply offset corrections based on time averages and applied states, ensuring accurate offset correction by distinguishing between applied and non-applied states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset correction is made using dynamic average during moving and static average or transition offset during still state, then the sensor can perform offset correction in different states, but the accuracy of offset correction is insufficient
Solution Approach 1:
The patent segments the operation into distinct phases: a first period when the sensor is still (for calculating static offset) and a second period when the sensor is moving (for calculating dynamic offset). This temporal segmentation allows the system to obtain accurate offset values under controlled conditions without mixing different operational states, thereby improving offset correction accuracy while maintaining manageable complexity through clear phase differentiation.
2Measurement precision
If multiple detection elements are used for angular velocity and acceleration, then measurement coverage is improved, but device complexity increases
Solution Approach 1:
The patent employs three separate uniaxial detection elements (one for angular velocity around each axis, one for acceleration in each direction) to measure physical quantities in three-dimensional space. This segmentation approach provides comprehensive measurement coverage along orthogonal axes while keeping each individual detection element simple and manageable.
Solution Approach 2:
The control circuit integrates multiple functions including signal processing, offset correction calculation, and data fusion from all six detection elements into a unified system. This multi-functionality approach allows the system to handle complex measurement tasks using a coordinated set of simpler components, improving overall measurement capability without proportionally increasing complexity.
3Productivity
If offset correction is performed continuously during both still and moving states, then real-time correction is achieved, but measurement precision deteriorates due to noise and errors
Solution Approach 1:
The patent divides operation into distinct temporal segments: a first period for still-state offset correction and a second period for moving-state offset correction. By separating these phases, the system can perform accurate offset correction in each state without the noise and errors that would occur during mixed-state continuous correction, while still achieving real-time correction capability through efficient phase transition handling.
Data Source
AI summary
A composite sensor includes angular velocity detection elements, acceleration detection elements, and a control circuit. The control circuit includes: acceleration averaging units; a decision processor for determining whether the composite sensor is in an applied state; an acceleration offset magnitude calculator; an acceleration corrector for applying an acceleration correction signal to an acceleration average signal to output a corrected acceleration signal; a signal processor for outputting a quaternion signal based on an angular velocity signal and a corrected acceleration signal; and an acceleration calculator for calculating acceleration information based on the quaternion signal. The acceleration offset magnitude calculator calculates, in accordance with the acceleration information when the composite sensor is not in the applied state, an acceleration correction signal when the composite sensor is in the applied state.