Inertial Rotation Sensor Hybridizing Unit for Drift and Noise
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Solution Overview
Problem
Existing inertial rotation sensors with vibratory resonators face challenges such as manufacturing defects, aging effects, and electronic noise aliasing, which degrade the accuracy of rotation measurements and introduce harmonic drift.
Innovation Solution
The inertial rotation sensor incorporates a vibratory resonator associated with two sets of transducers: first transducers operating in shared time with a multiplexer for motor and detection modes, and second transducers operating continuously with load amplifiers and ADCs for continuous detection, along with an electronic hybridizing unit to combine detection signals and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-shared operation with multiplexer is used for transducers, then processing anisotropy is eliminated and drift accuracy is improved, but electronic noise aliasing increases and angle noise degrades
Solution Approach 1:
The transducer system is segmented into two distinct groups: first transducers operating in time-shared mode with multiplexer for drift-critical measurements, and second transducers operating in continuous mode with dedicated amplifiers and ADCs for low-noise measurements. This segmentation allows each group to be optimized for its specific function, resolving the contradiction between drift accuracy and noise performance.
Solution Approach 2:
The invention merges the outputs of both transducer groups through an electronic hybridizing unit that combines the first detection signal from time-shared transducers and the second detection signal from continuous transducers. This merging allows the system to benefit from both the drift stability of time-shared operation and the low noise of continuous operation simultaneously.
2Object-affected harmful factors
If continuous detection mode is used for all transducers, then angle noise is reduced, but processing anisotropy increases and drift stability deteriorates
Solution Approach 1:
The transducer system is segmented into two distinct groups: first transducers operating in time-shared mode with multiplexer for drift-critical measurements, and second transducers operating in continuous mode with dedicated amplifiers and ADCs for low-noise measurements. This segmentation allows each group to be optimized for its specific function, resolving the contradiction between drift accuracy and noise performance.
Solution Approach 2:
The electronic hybridizing unit acts as an intermediary that processes and combines signals from both continuous and time-shared transducer modes. It receives the second detection signal from continuous transducers (low noise) and the first detection signal from time-shared transducers (high drift stability), merging them to produce an output that benefits from both characteristics.
3Manufacturing precision
If manufacturing defects and aging effects are present, then calibration compensation is required, but measurement accuracy decreases over time
Solution Approach 1:
The second transducers operate continuously in detection mode, providing uninterrupted measurement signals that enable ongoing monitoring and compensation of manufacturing defects and aging effects. This continuous operation ensures that calibration compensation remains effective over time, maintaining measurement accuracy despite environmental variations and component degradation.
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 minimizes processing anisotropy, reduces electronic noise, and preserves the stability of zero harmonic drift, resulting in improved navigation accuracy and reduced angle noise.
Implementation Method 1
an inertial rotation sensor with a vibratory resonator... measures the component of the angular rotation speed vector that is collinear with an axis of the sensor
Data Source
AI summary
An inertial rotation sensor comprising a vibratory resonator (1) associated with at least two first transducers (2.1) connected to a first electronic processor unit (5) via an electronic multiplexer member (6) in order to operate successively in a motor mode and in a detection mode and in order to supply a first detection signal. The vibratory resonator (1) is associated with at least two second transducers (2.2) that are connected via two load amplifiers (3.1), two anti-aliasing filters (3.2), and two ADCs (3.3) to a second electronic processor unit (4) in order to operate in detection mode and to supply a second detection signal. The sensor includes an electronic hybridizing unit (20) for forming a third detection signal from the first and second detection signals.