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针对目前磁阻传感器受周围磁场影响大、需要高精度外部基准的问题,设计了一种MSP430控制下的基于三轴磁阻传感器HMC5883的地磁场测量校正系统。介绍了磁阻传感器的工作原理、系统硬件和软件设计,分析了地磁场测量过程中的误差来源。实验结果证明,系统能有效地抑制和补偿地磁场测量误差,运行稳定,功耗低,能够不依赖外部基准实现对地磁场的测量和补偿。
In view of the fact that the magnetoresistive sensor is greatly affected by the surrounding magnetic field and needs a high-precision external reference, a geomagnetic measuring and correcting system based on the three-axis magnetoresistive sensor HMC5883 under MSP430 is designed. The working principle of the magnetoresistive sensor, the hardware and software design of the magnetoresistive sensor are introduced, and the sources of error in the geomagnetic field measurement are analyzed. The experimental results show that the system can effectively restrain and compensate the measurement error of the geomagnetic field, operate steadily, have low power consumption, and can measure and compensate the geomagnetic field without relying on the external reference.