Inertial measurement unit based on gyroscope and geomagnetic sensor

An inertial measurement device and geomagnetic sensor technology, which is applied in directions such as navigation through velocity/acceleration measurement, can solve the problems that the thin-film geomagnetic sensor cannot continuously determine the three-axis attitude, the influence of precision rate drift, and the high installation accuracy requirements, and achieves improved System accuracy and reliability, high dynamic range, cost-effective effects
CN101839719AInactive Publication Date: 2010-09-22ZHONGBEI UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
ZHONGBEI UNIV
Publication Date
2010-09-22
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses an inertial measurement unit based on a gyroscope and geomagnetic sensors. The unit is formed by a three-axis MEMS gyroscope and two film geomagnetic sensors. By using the characteristics that the film geomagnetic sensors do not accumulate errors with flight time, the film geomagnetic sensors and the inertial device, i.e. the three-axis MEMS gyroscope are designed in a combining way. The invention adopts a state estimation method, an attitude determination system takes the high-precision film geomagnetic sensors as attitude measurement references and corrects the drift of the three-axis MEMS gyroscope, and a comparatively accurate extended Kalman filter algorithm is adopted to improve the precision of attitude determination. The invention has the advantages of small volume, light weight and low cost, and can be used in the high-speed rotating missile attitude measurement field.
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Description

1. Technical field

[0001] The invention belongs to the field of attitude measurement of high-speed rotating bombs, and in particular relates to an inertial measurement device based on a gyroscope and a geomagnetic sensor. 2. Background technology

[0002] In modern warfare, precision strike is the general trend. On the one hand, countries around the world are working hard to develop new guided munitions, and on the other hand, they are also working hard to transform a large number of conventional ammunition into smart ammunition, so that they have precision strike capabilities. High-speed rotation is one of the most commonly used stabilization methods for conventional ammunition, and obtaining the attitude information of high-speed rotating projectiles is the only way to improve it. Therefore, it is particularly important to design an inertial measurement system suitable for high-speed rotation and small size. In traditional inertial measurement systems, linear accelerometer...

Claims

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