Cross axis effect of AMR sensors and single sensitive-axis compass

2010 IEEE International Conference on Mechatronics and Automation Pub Date : 2010-10-07 DOI:10.1109/ICMA.2010.5588994

Xisheng Li, Yanxia Liu, Ruiqing Kang, Zhihua Wang, Xiongying Shu

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引用次数: 1

Abstract

The anisotropic magnetoresistive (AMR) sensors provide an excellent means of measuring both linear and angular position and displacement in the earth's magnetic field. The electrical output of these sensors is proportional to the magnetic field strength along its sensitive axis. When such a sensor is spun around a horizontal plane starting from magnetic north, the output is a cosine function of the heading angle. Generally, a minimum of two sensors that are arranged mutually perpendicular would eliminate the ambiguity in electrical output with respect to heading direction. In this paper, based on cross effect estimation, the insensitive-axis cross-term of sensor A in HMC1002 is measured and a low power compass is designed. The results of experiment show that the accuracy of proposed compass is about 2° in horizontal position. The current consumption of proposed single sensitive-axis compass is about 20 mA, which is about 30% lower than that of formerly designed two sensitive-axis compass. It can be seen that proposed single sensitive-axis compass is effective.

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AMR传感器与单灵敏轴罗经的交叉轴效应

各向异性磁阻(AMR)传感器为测量地球磁场中的线性和角位置和位移提供了一种极好的方法。这些传感器的电输出与其敏感轴上的磁场强度成正比。当这样的传感器从磁北开始绕水平面旋转时，输出是航向角的余弦函数。通常，至少两个相互垂直排列的传感器将消除相对于航向方向的电输出的模糊性。本文在交叉效应估计的基础上，测量了HMC1002中传感器A的非敏感轴交叉项，设计了一种低功耗罗经。实验结果表明，所提出的罗经在水平位置的精度约为2°。所设计的单灵敏轴罗经电流消耗约为20 mA，比原设计的双灵敏轴罗经电流消耗低30%左右。由此可见，所提出的单灵敏轴罗经是有效的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 IEEE International Conference on Mechatronics and Automation

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