Gimbal Angle Sensor Common Mode Error Compensation
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Solution Overview
Problem
Satellite control systems face challenges in detecting and removing common mode errors caused by temperature fluctuations and radiation, which affect the accuracy of gimbal angle sensors due to shared circuit elements and ground loop currents.
Innovation Solution
A satellite control system incorporating a signal conditioner with similar circuit topology to the gimbal angle sensor and a common mode error compensation circuit that compares voltage outputs to generate an error signal, compensating for common mode errors by adjusting the input circuit and processor signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gimbal angle sensor is used in a satellite control system, then the system can measure gimbal angles, but common mode error from temperature fluctuations and radiation reduces measurement precision
Solution Approach 1:
The patent creates a duplicate output circuit with substantially identical circuit topology that does not receive the actual sensor signal but experiences the same common mode error. This copy circuit's output is used to determine the common mode error, which is then subtracted from the actual sensor output to compensate for the error and improve measurement precision.
Solution Approach 2:
The patent introduces an intermediary signal conditioner circuit that processes both the actual sensor output and the duplicate circuit output. This intermediary circuit generates a determined output that represents the common mode error, which is then used to compensate the original sensor signal through subtraction, thereby eliminating the harmful common mode error.
2Measurement precision
If signal conditioning circuits are added to compensate for common mode error, then measurement precision improves, but device complexity increases
Solution Approach 1:
Instead of adding complex error detection and compensation circuits, the patent simply creates a copy of the output circuit with identical topology. This copy requires no additional complex components and naturally experiences the same common mode error, providing an elegant solution that improves precision without significantly increasing device complexity.
Solution Approach 2:
The patent merges the error determination and error compensation functions into a unified signal processing approach. The signal conditioner circuit simultaneously processes the actual sensor signal and the duplicate circuit signal, combining them to produce a compensated output that eliminates common mode error while maintaining circuit simplicity.
Data Source
AI summary
A vehicle, a satellite control system, and a method for controlling the same are provided. The satellite control system, for example, may include, but is not limited to, a control moment gyroscope having a gimbal, at least one gimbal angle sensor configured to determine an angle of the gimbal, each gimbal angle sensor having an output circuit configured to output the determined angle, a signal conditioner circuit having substantially identical circuit topology as the output circuit, and a common mode error compensation circuit electrically coupled to the signal conditioner, the common mode error compensation circuit configured to determine common mode error in the gimbal angle sensor based upon a voltage output from the signal conditioner circuit and to output a signal to compensate for the common mode error.