Angular Velocity Sensor Bias Cancellation via Coordinated Switching
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Solution Overview
Problem
In azimuth/attitude angle measuring devices with multiple angular velocity sensors connected to a common power supply, power fluctuations occur when switching between electrodes to cancel bias components, leading to inaccurate angular velocity detection in other sensors.
Innovation Solution
The device includes a control unit that prevents simultaneous switching of the primary and secondary control circuits in other angular velocity sensors when one sensor detects the required angular velocity for switching, thereby stabilizing the power supply and ensuring accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If switching between electrodes is performed to cancel bias components in angular velocity sensors, then bias component cancellation is achieved, but power fluctuations occur in the common power supply affecting other sensors
Solution Approach 1:
The patent implements periodic switching between primary and secondary electrodes in each angular velocity sensor to cancel bias components. This periodic action is coordinated across multiple sensors sharing a common power supply, allowing bias cancellation to be performed at scheduled intervals rather than continuously, thereby reducing power supply fluctuations while maintaining measurement precision.
Solution Approach 2:
The control unit coordinates the switching timing of multiple angular velocity sensors beforehand, performing bias component cancellation in a predetermined sequence. This preliminary coordination ensures that sensors switch electrodes at different times, preventing simultaneous power supply fluctuations and maintaining stable operation of the common power supply.
2Device complexity
If multiple angular velocity sensors are connected to a common power supply, then device integration is improved, but power fluctuations from electrode switching cause inaccurate detection in other sensors
Solution Approach 1:
The control unit pre-coordinates the electrode switching timing for all angular velocity sensors connected to the common power supply. By scheduling switching operations in a predetermined sequence rather than simultaneously, the system maintains device integration simplicity while preventing power fluctuations from affecting measurement precision of other sensors.
3Measurement precision
If electrode switching is performed frequently to maintain accurate bias cancellation, then bias component accuracy is improved, but power supply stability deteriorates
Solution Approach 1:
The system performs bias component cancellation through periodic electrode switching at optimized intervals rather than continuously or too frequently. This periodic approach maintains adequate bias cancellation accuracy while allowing the common power supply to remain stable between switching events, resolving the conflict between measurement precision and power supply stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for accurate detection of angular velocities in each sensor connected to a common power supply unit, minimizing the impact of power fluctuations and ensuring reliable operation.
Implementation Method 1
a vibrator (11), a primary side control circuit (12) having a closed control loop, an output of the closed control loop inducing primary vibration in the vibrator (11)
Implementation Method 2
a secondary side control circuit (13) having a closed control loop for detecting secondary vibration generated in the vibrator (11) due to an angular velocity applied to the vibrator (11)
Data Source
AI summary
The azimuth/attitude angle measuring device (100) includes a first angular velocity sensor (103), a second angular velocity sensor (104), a power supply unit (102), and a control unit (101). The control unit is configured so that, when an angular velocity, which is to be used in an operation before and after interchanging a function of a primary side control circuit (12) and a function of a secondary side control circuit (13), is detected by one of the first angular velocity sensor and the second angular velocity sensor, the control unit does not perform control for interchanging the function of the primary side control circuit and the function of the secondary side control circuit in the other of the first angular velocity sensor and the second angular velocity sensor.