A method to eliminate zero drift of mems gyroscope

Abstract

The invention discloses a method for eliminating null shift of a micro-electromechanical system (MEMS) gyroscope. The method comprises the following steps of: (1) acquiring a zero-point value zero of an initial gyroscope; (2) arranging a tolerance range plus or minus allowance nearby the zero-point value zero of the initial gyroscope, and determining whether a difference value diff between a current output value of the gyroscope and the zero-point value zero of the initial gyroscope exceeds the minus or plus allowance or not; judging that the gyroscope is at a standstill if the difference value diff between the current output value of the gyroscope and the zero-point value zero of the initial gyroscope does not exceed the tolerance range, and enabling the current output value of the gyroscope to participate in the calculation of a zero point of the gyroscope; and judging that input is available outside if diff exceeds the tolerance range, and adopting the difference value as a magnitude of angular velocity of the gyroscope to be outputted normally and not to participate in the calculation of the zero point. Due to the adoption of the method, the null shift and temperature drift of the MEMS gyroscope can be effectively overcome, a precise and complex error compensation algorithm is not needed, and the zero point variation of the gyroscope can be tracked in real time.

Description

technical field [0001] The invention belongs to the field of micromechanical sensors, and relates to a MEMS gyroscope zero point calibration method, in particular to a method for eliminating zero drift, temperature drift and random walk of the MEMS gyroscope. Background technique [0002] The structure of the MEMS gyroscope is greatly reduced, and the single-package digital and analog interfaces occupy a very small board area, only a few square millimeters. Compared with traditional gyroscopes, the biggest advantages of MEMS gyroscopes are small size and obvious price advantage. These advantages make MEMS gyroscopes penetrate into the handheld device market. MEMS gyroscopes allow portable devices to add many amazing functions, such as image stabilization to improve camera shooting performance, easy-to-use user interface, and game entertainment functions. [0003] At the same time, MEMS gyroscopes will also be used for dead reckoning and GPS-assisted navigation that require ...

AI Technical Summary

Problems solved by technology

This method needs to use calculations involving matrices, which is not conducive to the processing of microprocessors such as single-chip microcomputers, and the output value of the gyro is also accompanied by zero-mean Gaussian white noise.

At the same time, the relationship derived by this method is accurate, and the value of each parameter needs to be determined. The external environment will change at any time, and the change of any parameter will affect the output value of the gyroscope, and the real-time adaptability is relatively poor.

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