本論文係實現以異向性磁敏電阻感測器（Anisotropic Magneto- Resistive Sensor）為基礎之三維度磁場感測系統，含括了三維度磁場量測數學模型的建立、感測器類比電路的設計、實現演算法之數位訊號處理平台設計、PC端人機介面軟體設計、測試平台機構的組裝，以及實際量測校正參數的結果與分析。 本文之重要突破技術為我們所設計之軟體演算法，係直接利用地球表面的磁場，即可校正地磁感測儀因AMR感測器本身特性不一致，以及元件焊接、組裝過程中所造成的非理想特性。 以軟體模擬分析本校正演算法的效能，當改變軸偏移量時量測得到的誤差落於0.05%FS以內；改變軸倍率時量測得到的誤差落於0.16%FS以內；當軸間相位差的誤差為零時，改變軸傾斜角時量測得到的誤差落於0.1%FS以內。以實際量得之數據代入演算法進行校正，並且使用校正出來的參數補償量測數據，則可發現軸偏移量與軸倍率明顯得到補正效果。 We implement a three-dimensional geo-magnetic sensing system based on Anisotropic Magneto-Resistive sensors. In this article, we describe the construction of the mathematic model, frameworks of the sensing circuit and signal processing circuit, concept of the human-machine interface, assembly of rotating-test platform, simulation result and true data analysis. We put more emphasis on the calibration algorithm of this system, which directly make use of the geo-magnetic field to calibrating our magnetometer. Therefore, we could compensate the un-ideal characteristics of the magnetometer. In simulation, the change of a single axis offset results to an RMS error within 0.05FS%; the change of a single axis sensitivity results to an RMS error within 0.16FS%; the change of a single axis skew angle results to an RMS error within 0.1FS% when we let the axes phase error (the α angle) off. In experiment, we use the algorithm to calculate the compensation parameters from raw data and compensate the raw data by using these parameters, then we find that the offsets and sensitivities are well-compensated.
