Geomagnetic Signal Detecting Based On Magneto-resistive Sensor

Navigation and positioning technology is an important branch of modern science. It has been widely used in aeronautics, astronautics and sailing. And with the rapid development of science, heading measuring system is becoming more and more modularization and integration. In recent year, along with the ever-improving of geomagnetic field model, development and maturation of magnetic sensor and electronic technologies, using the geomagnetic field for navigation assistance is developed very rapidly. For the geomagnetic auxiliary navigation requirements, a system of geomagnetic field detecting based on anisotropic magneto-resistance effect is introduced in this paper.First, this paper introduces the researching background of subject,features and component of geomagnetic signal. The basic principle and method of subject are analyzed and discussed. Combining geomagnetic signal detection and the actual needs, this paper points out a detecting program by using magneto-resistive sensor, functional geomagnetism detecting system, and also the overall design plan are detailed introduced. The system consists of magneto-resistive sensor, accelerometer, ADC and embedded microprocessors, etc. It has advantages of small size,light weight,low conception,all solid state and fast response. The system provides an effective means of geomagnetic signal detection.In the follow, this paper introduces the design of hardware and software in detail. Meanwhile, for the purpose to error compensation, this paper gives a detailed analysis of the causes of errors that may exist. And in order to improve accuracy of the system, several error compensation methods are put forward.Finally, the paper summarizes the work and introduces the prospect of the system in the future.