Vibrating Structure Gyroscope Precession Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vibrating structure gyroscopes introduce measurement errors that are not canceled out in the platform coordinate system, leading to navigation solution degradation during angular movements, despite alternating precession techniques used to mitigate errors in the measurement coordinate system.
Innovation Solution
A method and device for controlling the precession of a vibrating structure gyroscope that generates a first control signal to rotate the resonator in opposite directions, with a second control signal calculated based on relative positioning data between measurement and platform coordinate systems to minimize accumulated angular errors in the platform coordinate system, dynamically correcting errors that are significant only after coordinate system transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alternating precession technique is used to cancel errors in measurement coordinate system, then measurement errors in measurement coordinate system are reduced, but navigation solution accuracy in platform coordinate system deteriorates
Solution Approach 1:
The patent applies dynamics by making the precession control adaptive rather than fixed. The control signal parameters (amplitude, frequency, phase) are dynamically adjusted based on real-time feedback from the coordinate system transformation process. This allows the system to optimize error cancellation in the platform coordinate system while maintaining measurement coordinate system performance, resolving the contradiction between the two coordinate systems' accuracy requirements
Solution Approach 2:
The patent implements feedback by using the calculated navigation solution and coordinate transformation data to continuously adjust the precession control signal. The system monitors the navigation solution accuracy in the platform coordinate system and modifies the precession parameters accordingly, creating a closed-loop control that simultaneously maintains accuracy in both coordinate systems
2Measurement precision
If precession control signal is applied to rotate resonator vibration, then measurement errors are canceled in measurement coordinate system, but additional control complexity is introduced
Solution Approach 1:
The patent applies universality by designing the precession control signal generation unit to perform multiple functions: it generates the precession control signal, calculates coordinate transformations, monitors navigation solution accuracy, and adjusts control parameters in real-time. This multi-functional approach consolidates what would otherwise be separate systems into a single integrated unit, reducing overall system complexity while maintaining error cancellation capabilities
Solution Approach 2:
The system applies self-service by using its own navigation solution calculations and coordinate transformation data to automatically adjust its precession control parameters. The control system monitors its own performance and makes self-corrections without external intervention, simplifying the control architecture by eliminating the need for separate external calibration or control systems
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 approach effectively reduces the impact of measurement errors on navigation data by minimizing angular errors in the platform coordinate system, thereby improving the accuracy of navigation solutions provided by inertial measurement units.
Implementation Method 1
If the support of this gyroscope (that is assumed to be rigidly connected to the case of this same gyroscope) rotates about an axis normal to the plane of vibration (and thus of FIG. 1), the directions of vibrations V1 and V2 also undergo rotation about this axis under the effect of the Coriolis forces.
Data Source
AI summary
A method is proposed for controlling the precession of a gyroscope (1) comprising a support (2) and a resonator (3), the support (2) being mobile in a platform coordinate system and stationary in a measurement coordinate system, the method comprising the generation (101) of a first control signal suitable for rotating the resonator (3) with respect to the support (2) in two opposite directions of rotation during a first period, the method being characterized by the following steps:reception (104) of data (Tpm) on relative positioning between the measurement coordinate system and the platform coordinate system,calculation (105) of a second control signal to be generated during a second period on the basis of the first control signal and the relative-positioning data, the second control signal being chosen in such a way as to minimize an average of accumulated angular errors in the angular measurements acquired by the gyroscope during the entirety of the first and second period, the angular errors being expressed in the platform coordinate system.