Inertial Sensor Temperature Compensation Update Control
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Solution Overview
Problem
Inertial sensors face challenges in accurately correcting temperature drift across a broad temperature range, leading to increased power consumption due to the need for continuous output from the sensors for correction, and existing methods are inefficient in determining the resting state of the sensors.
Innovation Solution
An inertial sensor element control device with a memory for storing temperature compensation information and update history, along with determination circuits to assess the necessity of updates based on temperature sensor outputs and sensor element outputs, allowing for precise updates only when necessary, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature correction is performed using existing methods, then temperature drift correction is achieved, but power consumption increases due to continuous sensor output requirement
Solution Approach 1:
The system performs preliminary determination of whether temperature correction is necessary by checking temperature change magnitude and rest state conditions before actually executing the correction process. This preliminary action avoids unnecessary continuous operation of the inertial sensor, thereby reducing power consumption while maintaining correction accuracy when needed.
Solution Approach 2:
The correction system dynamically adjusts its operation based on real-time temperature monitoring and sensor state detection. The system transitions between active correction mode and standby mode based on whether temperature changes exceed thresholds and whether the sensor is in rest state, optimizing power consumption according to actual needs.
2Measurement precision
If temperature correction is performed across broad temperature range, then correction accuracy is improved, but update frequency increases leading to higher power consumption
Solution Approach 1:
The system applies different correction strategies based on local temperature conditions. Instead of uniformly updating correction values across the entire temperature range, it selectively updates only when temperature changes signify meaningful drift, concentrating correction efforts where actually needed rather than uniformly across all temperature points.
Solution Approach 2:
The system performs partial updates of temperature compensation information rather than complete re-calibration. It updates only the necessary correction parameters when temperature conditions warrant it, avoiding excessive full-scale updates while maintaining sufficient correction accuracy for the current temperature range.
3Measurement precision
If rest state determination is always performed, then correction data accuracy is improved, but system complexity and processing load increase
Solution Approach 1:
The system performs preliminary checks of temperature change magnitude and sensor output characteristics before initiating full rest state determination procedures. This preliminary filtering reduces the frequency of complex determination operations, maintaining accuracy when needed while reducing overall system complexity and processing burden.
Data Source
AI summary
A control device connected to an inertial sensor having temperature characteristics, the control device including a memory for storing temperature compensation information, and update history information, an update determination circuit for determining the necessity of a temperature compensation information update based on a signal that is based on an output signal of a temperature sensor and the update history information, a rest determination circuit for determining whether the inertial sensor is at rest, and an updating circuit for updating the temperature compensation information based on the determination of the update determination circuit, the determination of the rest determination circuit, a signal based on an output signal of the inertial sensor, and the signal based on the output signal of the temperature sensor.