Gyroscopic Sensor Servo Control for Anisotropy Error Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gyroscopic measurement methods suffer from intrinsic errors due to stiffness or damping anisotropies, control electronic component defects, and reference voltage instabilities, leading to inaccurate angular speed measurements, especially when the sensor is in motion.
Innovation Solution
A gyroscopic measurement method and sensor that simultaneously excites a vibrating element along both pilot and detection modes with predetermined amplitudes, using servo modules to maintain non-zero amplitudes, allowing for the estimation and correction of anisotropy errors through phase quadrature forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vibrating element is excited only along the pilot mode direction with constant amplitude, then the measurement system remains simple, but measurement precision deteriorates due to uncorrected anisotropy errors
Solution Approach 1:
The patent applies periodic modulation to the pilot mode vibration amplitude, varying it between first and second amplitudes during different time intervals. This periodic action enables the system to acquire multiple measurement signals under different vibration conditions, allowing for the calculation and correction of anisotropy errors through comparison, thereby improving measurement precision without requiring complex additional hardware
Solution Approach 2:
The patent changes the vibration amplitude parameter of the pilot mode between two distinct values (first amplitude and second amplitude) during operation. By measuring the detection mode response at different pilot mode amplitudes, the system can determine anisotropy error components and apply corrections, thus improving measurement precision while using the existing sensor structure
2Reliability
If servo control is applied to maintain constant pilot mode amplitude, then measurement stability improves, but measurement precision worsens due to anisotropy errors in the servo system
Solution Approach 1:
Instead of maintaining constant amplitude through servo control, the patent deliberately applies periodic modulation to vary the pilot mode amplitude between first and second amplitudes. This approach transforms the problem by using the amplitude variations to generate measurable differences that reveal anisotropy errors, allowing correction while maintaining measurement stability through proper signal processing
Solution Approach 2:
The patent uses feedback from the detection mode measurements to calculate anisotropy error components based on the differences observed when pilot mode amplitude varies. This feedback mechanism enables real-time correction of measurement errors, improving precision while maintaining the stability needed for accurate angular speed determination
3Measurement precision
If the vibrating element amplitude in detection mode is kept at zero, then the system operates simpler, but measurement precision deteriorates due to inability to detect anisotropy errors
Solution Approach 1:
The patent applies periodic modulation to the pilot mode amplitude, creating alternating first and second amplitudes during operation. This periodic variation generates corresponding variations in the detection mode response that contain information about anisotropy errors, enabling their calculation and correction without requiring continuous detection mode excitation
Solution Approach 2:
The patent performs preliminary measurements of the detection mode response at different pilot mode amplitudes to calculate anisotropy error components before final angular speed determination. This preliminary action allows the system to characterize and correct for anisotropy errors, improving measurement precision while maintaining operational simplicity
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
Improves measurement precision by quantitatively accounting for anisotropy errors, resulting in more accurate instantaneous angular speed calculations regardless of the sensor's movement in an inertial frame.
Implementation Method 1
the displacement of the vibrating element along the direction of the pilot mode generates a Coriolis force. Said force excites the vibrating element along the direction of the detection mode
Implementation Method 2
the geometrical vibration position of the gyroscope is modified voluntarily by electrostatic means over time
Data Source
AI summary
The present invention relates to a method (400) of gyroscopic measurement by means of a sensor (10) comprising a housing (12) and a vibrating element (15) apt to vibrate relative to the housing (12) comprising supplying a first servo module (20) with a first force (Fx) to be exerted along the direction of the pilot mode (x) on the vibrating element (15), and a pilot amplitude (xmax) for servoing the vibrations along the direction of the pilot mode (x); the simultaneous use of the first force (Fx) and of the servoing of the vibrating element (15) along the direction (x) of the pilot mode; the supply to a second servo module (25) of a second force (Fy) to be exerted in phase quadrature with the first force along the direction of the detection mode (y), and a non-zero vibration servo amplitude (ymax) along the direction (y) of the detection mode; the simultaneous use of the second force (Fy) and of the servoing along the direction (y) of the detection mode; and the determination of an instantaneous angular speed (Ω(t)) of the housing in an inertial frame of reference.