Giant magneto-impedance (GMI) magnetic sensors have great potential to be next generation of magnetic sensors for
space applications. This article concerns the design of a GMI micro-magnetic sensor based on amorphous alloys using
the theory of GMI effect, which covers sensing materials, construction of sensor, working principle and signal detection
method. Co-based amorphous ribbons are selected as the preferred sensing elements since they have good soft magnetic
properties, such as high saturated magnetization, low coercivity, high magnetic permeability and excellent mechanical
properties. Co-based amorphous ribbons of 20 ~ 60 m thick and 1 ~ 3mm wide are fabricated and their magnetic
properties, mechanical properties and GMI effects are studied for their applications as GMI sensing elements. Sensor
output can be acquired by utilizing phase-sensitive detection method with higher noise suppression. This work provides a
preliminary investigation into the high performance of a micro-magnetic sensor for space applications.
Geomagnetic field is the basic physics field of the Earth, which can't be destroyed or changed in the foreseeable future.
Geomagnetic field don't require special service, therefore, it can be considered as a solid source of navigation
information. The key technologies of geomagnetic navigation are still looking for high accuracy mapping and high
accuracy geomagnetic field measurement on board aircraft, this paper special attention is paid to the data grid
interpolation methods, the absolute accuracy of the interpolation methods are analyzed by comparing interpolation point
with the actual surveyed point, and the geomagnetic map grid interpolation methods can be evaluated impersonally by
residuals analysis. The results show that Radial Basis Function Method has little standard error, little average deviations
and little standard deviations, and it has little "bull's-eyes" in the geomagnetic map.
Low-cost MEMS sensors often suffer from inaccuracy and are influenced greatly by temperature variation, and the
orientation error is cumulate with time. The GPS can provide long term stability with high accuracy, but it has its
insufficiencies, such as disturbed easy, lower data updating rate and so on, it is hard to meet the demand of real-time
measuring. The micro-magnetic sensors, an independence precision tool, can offer real-time yaw attitude angle, and this
can correct the orientation cumulate error, and it increase the independence in flight of the UAV. Based on analyzing the
selection principles of testing sensor, comparing 3 kinds micro-magnetic sensors, the GMI magnetic sensor is best to test
geomagnetic field. The Regional model of geomagnetic field is built, and a GMI-magnetic sensor navigation method is
put forward. Three-axis magnetic sensor measure the geomagnetic field, and it is matching with the geomagnetic map,
then the geomagnetic elements on currently position are knew, combining with the information of accelerometer, the
position information can be gotten by matching algorithm.