Inertial Measurement Unit Error Detection for Position Estimation
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Solution Overview
Problem
Existing position detection systems for machines using two inertial measurement units face challenges in identifying a faulty unit without increasing system cost and complexity, as they often require a third unit for cross-checking.
Innovation Solution
A system employing a primary and secondary inertial measurement unit, along with an error detection module that detects out-range and in-range errors based on predetermined thresholds, determines actions to be taken when errors are detected, allowing for fault identification and reduced system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third inertial measurement unit is employed to determine the faulty unit, then the reliability of fault identification is improved, but the device complexity and cost increase
Solution Approach 1:
The two existing inertial measurement units perform cross-validation of each other's readings. The processor compares data streams from both units and uses consistency checks to identify which unit is faulty, eliminating the need for a third unit. Each unit serves its primary function while also acting as a validation mechanism for the other.
Solution Approach 2:
The system continuously monitors and compares position signals from both inertial measurement units in real-time. When discrepancies are detected, the system uses feedback loops to determine which unit is providing accurate readings and which is faulty, enabling dynamic fault identification without additional hardware.
2Reliability
If cross-checking readings from two inertial measurement units is performed, then the reliability of position detection is improved, but the device complexity increases
Solution Approach 1:
The patent combines the functions of position measurement and fault detection into a single integrated system using existing components. The processor simultaneously performs position calculation from both units and cross-validation of their readings, merging multiple functions into unified operations rather than requiring separate systems.
Solution Approach 2:
The two inertial measurement units serve multiple purposes: they both provide position data for navigation while simultaneously serving as mutual validation sensors for fault detection. This multi-functionality allows the system to achieve both accurate positioning and reliability verification without adding dedicated fault detection hardware.
Data Source
AI summary
A system having a primary inertial measurement unit and a secondary inertial measurement unit configured to generate a primary position signal and a secondary position signal respectively is provided. The system also includes an error detection module communicably coupled to the primary inertial measurement unit and the secondary inertial measurement unit. The error detection module is configured to receive the primary position signal and the secondary position signal and detect if an out-range error is present in at least one of the primary position signal and the secondary position signal. The error detection module is also configured to detect if an in-range error is present in at least one of the primary position signal and the secondary position signal and determine an action to be performed based on the presence of at least one of the out-range error and the in-range error.