Three-axis magnetic sensor and dual-axis inclinometer are used to develop the three-dimensional magnetic electronic compass.The HMC1043 magnetic resistance sensor with three-axis can measure the earth magnetic density

and the SCA100T inclinometer can measure the roll and pitch angle of the compass.These signals are processed by signal processing circuit and then transferred to the MCU.The MCU collects these signals and then transmits them to a computer through the RS—232 interface.The computer has a VC program to process the data and display the azimuth

roll and pitch angles through an interface.To ensure the sensitivity of the magnetic resistance sensor

this system has a low power set/reset circuit.The compass’s accuracy of the azimuth is 0.5°

and the resolution of the azimuth is 0.1°.