Vibrating Sensor Alignment Minimizing Drift Error
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Solution Overview
Problem
Axially symmetrical vibrating sensors used in navigation units for free-gyro mode suffer from significant drift errors that vary with position, temperature, and time, affecting navigation accuracy and repeatability during the alignment stage.
Innovation Solution
A method to align the inertial unit by selecting a vibration position that minimizes drift error variations, considering temperature and time effects, and storing this position for consistent alignment, allowing for error modeling and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vibration position is arbitrary at startup, then the system can be easily initialized, but the drift error varies significantly affecting navigation accuracy
Solution Approach 1:
The patent applies preliminary action by pre-determining the optimal vibration position that minimizes drift error before the actual navigation operation begins. The system performs a preliminary alignment stage where the vibration is positioned to minimize drift error variations, and this position is stored for subsequent alignments, ensuring consistent low-drift operation without requiring arbitrary positioning at each startup.
2Adaptability or versatility
If the vibration position changes from one startup to another, then the system adapts to different initial conditions, but the drift error becomes variable and disturbs alignment quality
Solution Approach 1:
The patent applies parameter changes by systematically varying the vibration position parameter during the preliminary alignment stage to identify and establish the optimal position that minimizes drift error. Once this optimal position is determined, it is fixed and stored, ensuring that subsequent operations use this consistent parameter setting rather than allowing arbitrary variations, thus improving reliability while maintaining the ability to adapt through the initial optimization process.
Data Source
AI summary
The method of aligning an inertial unit having an axially symmetrical vibrating sensor that generates vibration comprises the step of establishing the vibration in a position for which the sensor presents variation in drift error that is the smallest relative to variation in drift error for other positions of the vibration.