基于MEMS传感器的电子罗盘设计  

Design of Electronic Compass Based on MEMS Sensor

作　　者：王昌刚[1] 顾锐[1] 余云智[1] 

机构地区：[1]江苏自动化研究所,江苏连云港222000

出　　处：《航空兵器》2013年第4期31-33,40,共4页Aero Weaponry

摘　　要：电子罗盘是一种通过测量地球磁场获得载体航向角的设备。利用MEMS三轴磁阻传感器和Atmega128单片机设计了一种高集成度、低功耗、小型化的电子罗盘。介绍了电子罗盘的设计原理及其具体实现,分析了系统测量精度的误差来源,并通过最小二乘法对其进行误差补偿。实验结果表明,在对硬磁材料引起的半圆罗差和软磁材料引起的圆周罗差及象限罗差的误差补偿后,系统航向角误差可从±24.5°提高到±2.5°。Electronic compass is a kind of device, which can acquire the heading angle by measuring earth＇s magnetic field. A highly integrated, low -power consumption and miniaturized electronic compass is designed by using MEMS （ Micro - Electro - Mechanical Systems） 3 - axis magnetoresistive sensor and Atmega128 microcontroller. This paper introduces the principles of the electronic compass, analyses the systematic error sources, and computes the error compensation with least squared method. Experimental results show that the error of heading angle can be reduced from ±24.5°to ±2.5° after error compensa- tion for semicircular deviation caused by hard magnetic materials, circumferential deviation and quadran- tal deviation caused by soft magnetic material.

关 键 词：载体航向角测量 电子罗盘 磁阻传感器 误差补偿 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置] V241.611[自动化与计算机技术—控制科学与工程]