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TMR (Triple Modular Redundancy) electronic compass

An electronic compass and power bridge technology, which is applied in compass, measuring device, surveying and navigation, etc., can solve the problems of low dynamic range, low measurement accuracy and large package size of electronic compass, and achieve good temperature characteristics, high measurement accuracy, Small package size effect

Active Publication Date: 2010-08-25
王建国 +1
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AI Technical Summary

Problems solved by technology

[0005] The invention provides an electronic compass prepared by utilizing the TMR sensor of the tunnel junction magnetoresistance effect principle and a giant Hall effect sensor, and solves problems such as low dynamic range of the current electronic compass and easy saturation, low measurement accuracy, large package size, high power consumption, and poor temperature characteristics, etc. question

Method used

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  • TMR (Triple Modular Redundancy) electronic compass

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Embodiment Construction

[0015] The invention relates to an electronic compass utilizing the principle of tunnel junction magnetoresistance effect (TMR). TMR electronic compass includes TMR wheatstone bridge sensor, giant hall effect magnetic sensor, three-axis acceleration sensor chip, sensor ASIC chip and micro central processing unit. Used to measure the Earth's magnetic field to determine direction.

[0016] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0017] The structure of tunnel junction magnetoresistance (TMR), as shown in Figure 1(a), consists of nanoscale multilayer films: pinning layer 1, magnetic pinned layer 2, nonmagnetic oxide layer 3, and magnetic free layer 4. The magnetic moment direction of the magnetic pinned layer 2 is shown in FIG. 5 . The magnetic moment direction of the magnetic free layer 4 is shown in FIG. 6 . The magnetic moment direction 5 of the magnetic pinned layer 2 is perpendicular to the magnetic moment d...

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Abstract

The invention relates to a TMR (Triple Modular Redundancy) electronic compass utilizing a tunnel junction magneto-resistance effect. The TMR electronic compass comprises a TMR Wheatstone bridge sensor, a huge Hall effect magnetic sensor, a triaxial acceleration sensor chip, a sensor ASIC (Application Specific Integrated Circuit) chip and a micro central processing unit, wherein the TMR Wheatstone bridge sensor is used for measuring magnetic fields in an X direction and a Y direction; and a magnetic field in a Z direction can be measured by using the TMR Wheatstone bridge sensor and also be measured by using the huge Hall effect magnetic sensor, and in the invention, both the two design schemes are proposed. The TMR electronic compass has the following characteristics of wide dynamic range, high measuring precision, small packaging size, good temperature characteristic, high response frequency, low cost and strong anti-interference performance.

Description

technical field [0001] The invention relates to an electronic compass utilizing the principle of tunnel junction magnetoresistance effect (TMR). Background technique [0002] The electronic compass made of magnetoresistance material is also called digital compass, which is widely used in the fields of navigation, positioning and orientation. Its working principle is to measure the direction of the earth's magnetic field. Although GPS has been widely used in the above fields, its accuracy is greatly reduced because its signal is often blocked by buildings. Especially in the city center full of high-rise buildings and densely vegetated forest areas, and in the case of static, GPS cannot give direction information. In order to make up for this deficiency, the combined navigation and orientation method of GPS and electronic compass is usually used to ensure that the navigation orientation information is 100% effective. [0003] Compared with traditional compass and inertial na...

Claims

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Application Information

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IPC IPC(8): G01C17/32G01C17/30
Inventor 王建国薛松生
Owner 王建国
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