Moving Sensor Calibration With Refractory-Aware Reading Alignment
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Solution Overview
Problem
Moving sensors in vehicles, such as those measuring ambient conditions, face challenges in accurate calibration due to their dynamic nature, with existing methods often neglecting refractory time periods, leading to inefficient and potentially missed calibration opportunities.
Innovation Solution
A method that involves obtaining information about refractory time periods for both the sensor and calibration sensor, ensuring spatial and temporal alignment during calibration by delaying readings, and utilizing predefined proximity zones defined by distance or geolocation, with optional consideration of movement patterns and machine learning for identifying calibration needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensor readings are taken continuously during movement, then calibration opportunities are maximized, but readings may be taken during refractory periods when sensors cannot reliably measure
Solution Approach 1:
The system performs preliminary actions by predicting future proximity events between sensors and calibration targets, and proactively scheduling calibration readings to occur just before or during these events. This allows the system to prepare calibration opportunities in advance while ensuring readings are taken at optimal moments, avoiding refractory periods through careful timing coordination.
2Reliability
If sensor readings are delayed to avoid refractory periods, then reading reliability is improved, but calibration opportunities may be missed due to short proximity time periods
Solution Approach 1:
The system dynamically adjusts the timing of sensor readings based on real-time proximity predictions and refractory period status. Instead of fixed delays, the system flexibly schedules readings to occur at the optimal moment when both proximity conditions are met and the sensor is ready to measure, adapting to varying relative velocities and refractory period durations.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring sensor status, proximity predictions, and refractory period timing. This feedback loop allows the system to adjust reading schedules in real-time, ensuring that calibration opportunities are captured while respecting sensor readiness constraints, thereby maintaining both reliability and calibration frequency.
3Measurement precision
If spatial and temporal alignment is enforced for calibration readings, then calibration accuracy is improved, but the complexity of coordinating moving sensors increases
Solution Approach 1:
The system replaces complex mechanical coordination of moving sensors with computational methods. Instead of physically synchronizing sensor positions and timings through mechanical means, the system uses software-based proximity predictions, refractory period tracking, and intelligent scheduling algorithms to achieve spatial and temporal alignment, significantly reducing mechanical complexity while maintaining calibration accuracy.
Data Source
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Figure 3
AI summary
The invention relates to a method for calibrating at least one sensor (1) by use of at least one calibration sensor (2), wherein the at least one sensor (1) and the at least one calibration sensor (2) are moving relative each other during calibration, the method comprising: - obtaining information indicative of a proximity time period (pt) when the at least one sensor (1) and the at least one calibration sensor (2) are and/or will be in a predefined proximity zone (PZ) of each other for a time period which is sufficient for calibration; - obtaining information about a refractory time period (rs, rc) for at least one of the at least one sensor and the at least one calibration sensor, the refractory time period defining a time period between two consecutive sensor readings in which the sensor is unable to take a sensor reading; - calibrating the at least one sensor by a sensor reading of the at least one sensor and a sensor reading of the at least one calibration sensor, which sensor readings are taken when they are in the predefined proximity zone (PZ), wherein the refractory time period (rs, rc) for the at least one of the at least one sensor and the at least one calibration sensor is considered by delaying its sensor reading such that it is ensured that the sensor readings of the at least one sensor (1) and the at least one calibration sensor (2) are spatially and temporally aligned for the calibration.