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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

Inactive Publication Date: 2010-09-22
ZHONGBEI UNIV
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Problems solved by technology

[0004] The invention provides an inertial measurement device based on gyroscopes and geomagnetic sensors, which solves the problems of complicated installation, high installation accuracy requirements, complex calculations and the drift of gyroscope angular rate in traditional inertial measurement using accelerometers. and the problem that the thin-film geomagnetic sensor cannot be used for continuous three-axis attitude determination, and on this basis, the generalized Kalman filter estimation algorithm is combined, which is of great significance for the research of inertial integrated navigation systems and improving the attitude information of high-speed rotating bombs Practical application value

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  • Inertial measurement unit based on gyroscope and geomagnetic sensor
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  • Inertial measurement unit based on gyroscope and geomagnetic sensor

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Embodiment Construction

[0016] Further details will be given below through embodiments in conjunction with the accompanying drawings.

[0017] An inertial measurement device based on a gyro and a geomagnetic sensor is set in a metal cylinder of cylindrical aluminum material, and a three-axis MEMS gyro is arranged in the metal cylinder. The three-axis MEMS gyro is composed of a gyro surface 1, a gyro surface 3 and a gyro surface 4. A thin-film geomagnetic sensor is arranged on the outer wall of the metal cylinder, and the thin-film geomagnetic sensor is composed of a thin-film coil sensor 2 and a thin-film coil sensor 5 , and the thin-film coil sensor 2 is perpendicular to the thin-film coil sensor 5 .

[0018] The three-axis MEMS gyroscope is installed on the orthogonal plane of the attitude test system, and their sensitive axes are perpendicular to each other to form a three-dimensional coordinate system of the measuring body, such as figure 1 As shown, GX, GY, and GZ are the three sensitive axes of...

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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.

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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Application Information

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IPC IPC(8): G01C21/16G01C21/18
Inventor 崔敏马铁华曹咏弘范锦彪
Owner ZHONGBEI UNIV
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