Vehicle Display Orientation Correction Under Gyro Temperature Drift
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Solution Overview
Problem
Existing display devices, such as navigation devices, struggle to accurately display images due to variations in ambient temperature affecting the sensitivity of angular velocity sensors, leading to incorrect vehicle orientation estimation and image deviation.
Innovation Solution
A display device that includes a sensitivity corrector to adjust angular velocity based on ambient temperature, a first orientation estimator, a second orientation estimator, an orientation corrector for precise vehicle orientation using satellite positioning, and an update processor to maintain sensitivity accuracy by recalculating and updating sensitivity based on vehicle position and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If angular velocity sensor is used to estimate vehicle orientation, then orientation estimation is achieved, but measurement precision deteriorates due to temperature-induced sensitivity variations
Solution Approach 1:
The patent applies parameter changes by detecting ambient temperature and adjusting the sensitivity parameter of the angular velocity sensor accordingly. The sensitivity correction unit modifies the sensor's sensitivity based on temperature-dependent calibration data, compensating for thermal drift and maintaining measurement precision across varying temperature conditions.
Solution Approach 2:
The patent implements feedback through a closed-loop system where the actual vehicle orientation (from satellite positioning) and estimated orientation (from angular velocity sensor) are continuously compared. The deviation detected by the orientation correction unit feeds back to adjust sensitivity parameters, ensuring continuous improvement of measurement accuracy.
2Measurement precision
If sensitivity correction based on ambient temperature is applied, then measurement precision is improved, but device complexity increases due to additional temperature sensing and correction mechanisms
Solution Approach 1:
The patent merges the temperature compensation function with the existing orientation estimation system. The temperature sensor and sensitivity correction unit are integrated into the navigation device's processing unit, allowing simultaneous temperature monitoring and orientation calculation without requiring separate independent systems.
Solution Approach 2:
The processing unit is designed to perform multiple functions: it processes angular velocity data, temperature data, satellite positioning data, and sensitivity correction calculations. This multi-functional approach eliminates the need for dedicated separate components for each function, reducing overall system complexity.
3Reliability
If sensitivity is updated based on vehicle position and speed, then reliability is improved over time, but loss of time occurs during sensitivity recalculation and update processes
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing sensitivity correction values for various temperature conditions in calibration data. During operation, the system only needs to lookup and apply the appropriate correction factor based on current temperature, rather than performing complex real-time calculations, thus minimizing processing time.
Solution Approach 2:
The sensitivity update process operates continuously in the background without interrupting the primary orientation estimation function. The processing unit continuously receives new data from sensors and satellite positioning, continuously updates sensitivity parameters, and maintains uninterrupted navigation functionality throughout the update process.
Data Source
AI summary
A display device includes a processing circuit and a display. The processing circuit obtains an ambient temperature of a gyro sensor, obtains a sensitivity associated with a temperature range including the ambient temperature, corrects an angular velocity of the gyro sensor in accordance with the sensitivity, estimates a first estimated vehicle orientation based on the angular velocity corrected, estimates a second estimated vehicle orientation based on the angular velocity detected by the gyro sensor, derives a third estimated vehicle orientation by correcting the first estimated vehicle orientation using a position and a speed of vehicle, and updates the sensitivity of the temperature range using a calculated sensitivity that is based on the second estimated vehicle orientation and the third estimated vehicle orientation. The display displays an image that is in accordance with the third estimated vehicle orientation.