Inertial Sensor Calibration via Rotational Table Bias Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inertial sensors, such as gyroscopes, face challenges in accurately determining bias and error values in dynamic or moving environments, limiting their application and accuracy in navigation and orientation systems.
Innovation Solution
An inertial sensor system with a rotational table and platform, where gyroscopes on the table and platform measure rotation rates and angles to process and correct biases, using differential motion and accelerometers to remove errors from measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system is placed into a non-rotational environment to measure bias, then gyroscope bias can be accurately measured, but the system cannot be used in dynamic or moving environments
Solution Approach 1:
The patent applies the dynamics principle by introducing a rotational table that can rotate about the x-axis, transforming the static calibration environment into a dynamic one. This allows the system to simulate various rotational conditions while still enabling bias measurement, thereby resolving the contradiction between measurement accuracy and adaptability to dynamic environments.
Solution Approach 2:
The patent changes the operational parameters by introducing controlled rotation about the x-axis while measuring biases along other axes. This parameter change allows the system to maintain measurement precision while adapting to dynamic conditions, as the rotation creates distinguishable patterns that enable accurate bias extraction even in motion.
2Measurement precision
If multiple gyroscopes are used on the rotational table and platform, then bias correction accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the measurement function by placing gyroscopes on both the rotational table and the platform, with each set measuring specific components of rotation. This segmentation allows for more accurate bias correction through differential measurement while keeping each individual gyroscope simple and manageable.
Solution Approach 2:
The rotational table acts as an intermediary between the platform and the gyroscopes, providing a controlled rotation mechanism that enables the gyroscopes to measure specific rotational components. This intermediary structure facilitates accurate bias measurement without requiring direct complex mounting of all gyroscopes on the moving platform.
Data Source
AI summary
An inertial sensor system according to one embodiment having a platform with an x axis and a y axis, a rotational table that is free to rotate about the x axis, a rotational table gyroscope mounted onto the rotational table to measure p, q, and r rotation rates referenced to the rotational table and at least one platform gyroscope mounted off the rotational table, wherein the rotational table gyroscope and the platform gyroscope provide sense rotation used to process gyroscope biases that are used to correct measurements for the inertial sensing system.