The The Geomagnetic Signal Detection System Design And Error Compensation

Earth's geomagnetic field is a kind of geophysical field, and it is one-to-one correspondence with geographical position. Geomagnetic navigation is a kind of navigate method which makes use of the characteristic quantity of magnetic signal, combining with a certain matching algorithm to fix the orientation, and it acts as a passive autonomous navigation method having advantages of high anti-interference ability, all-weather and moderate accuracy, and domestic and international scholar s have done much research on it in recent years.Acquiring high-precision, real-time geomagnetic signal is one of the prerequisites for successful geomagnetic navigation technology, and it is related with the success of the follow-up matters. In order to obtain high-precision, real-time geomagnetic signal, based on studying the composition and features of Earth's geomagnetic field, this thesis built an geomagnetic signal acquisition system based on magnetoresistive sensor and MCU, achieved the communication between geomagnetic signal acquisition system and the host computer through the serial port and wrote a data storage interface on the host computer to store geomagnetic signals making use of communication control MSComm in the environment of VB6.0.In the environment of MATLAB, removed noise in the geomagnetic signals through wavelet analysis and reconstructed geomagnetic signals. On this basis, this thesis studied sensitivity error, non-orthogonal error and zero drift error about three-axis magnetoresistive sensor, built an error parameter model, built an objective optimization functions about error parameter on the basis of engineering optimization design idea and acquired the optimal error compensation parameters through coordinate transformation method.This thesis revised geomagnetic signals processed by wavelet analysis making use of the optimal error compensation parameters, reducing standard deviation of geomagnetic signals from 1.2*10-3Gs to 3.7*10-4Gs.Research in this thesis shows that doing error compensation for the actual magnetic data is able to effectively raise the precision and stability of geomagnetic signals and revise geomagnetic signals, laying a foundation for the successful achievement of geomagnetic navigation...