Inertial Measurement Unit Temperature Drift Calibration via GPS Reference
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Solution Overview
Problem
Current on-board map technologies lack a specific solution for determining the current temperature drift value of inertial measurement units, which affects the accuracy of navigation dead reckoning algorithms due to temperature changes.
Innovation Solution
A method that acquires measurement values from inertial measurement units and global positioning systems to calculate the temperature drift calibration value in real time, using differences and pre-determined values from stationary states to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature drift calibration is not performed in real-time, then the system complexity remains low, but the navigation accuracy deteriorates due to temperature-induced errors in inertial measurement units
Solution Approach 1:
The patent implements feedback by continuously comparing the measurement value from the inertial measurement unit with the reference value from the global positioning system, calculating the temperature drift calibration value based on their difference, and using this feedback to compensate for temperature-induced errors in real-time, thereby maintaining navigation accuracy without excessive system complexity
Solution Approach 2:
The patent introduces the global positioning system as an intermediary reference source to indirectly measure and compensate for temperature drift in the inertial measurement unit. By using GPS speed values as a reference, the system can calculate temperature drift calibration values without directly measuring temperature, simplifying the overall system while improving accuracy
2Ease of operation
If temperature drift calibration is performed using only stationary state data, then the calibration process is simple, but it cannot provide real-time compensation for dynamic temperature changes during navigation
Solution Approach 1:
The patent performs preliminary calibration by determining the temperature drift calibration value in the stationary state before navigation begins. This preliminary action establishes a baseline calibration value that is then used as a reference for real-time compensation during dynamic navigation, combining simplicity with real-time effectiveness
Solution Approach 2:
The patent transitions from static calibration to dynamic compensation by continuously updating the temperature drift calibration value during navigation based on real-time differences between inertial measurement unit outputs and global positioning system reference values, enabling the system to adapt to changing temperature conditions
Data Source
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AI summary
Embodiments of the present disclosure disclose a method, apparatus, device, and medium for calibrating a temperature drift, relate to on-board map technology. The method includes: acquiring a first measurement value and a second measurement value, the first measurement value being a measurement value of a to-be-measured quantity at a current moment determined based on an inertial measurement unit, and the second measurement value being a measurement value of the to-be-measured quantity at the current moment determined based on a global positioning system; and determining a temperature drift calibration value of the inertial measurement unit at the current moment based on the first measurement value and the second measurement value. The embodiments of the present disclosure may realize a technical effect of determining the current temperature drift calibration value of the inertial measurement unit in real time, which lays a data foundation for subsequent compensation of the temperature drift in a navigation dead reckoning algorithm, thereby improving the accuracy of a navigation result.