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    • 9. 发明申请
    • ELECTRONIC COMPASS SYSTEM
    • 电子指南针系统
    • WO2003074969A2
    • 2003-09-12
    • PCT/US2003/006029
    • 2003-02-28
    • GENTEX CORPORATION
    • OCKERSE, Harold, C.BECHTEL, Jon, H.BUGNO, Mark, D.WATSON, Alan, R.TURNBULL, Robert, R.
    • G01C
    • G01C17/30G01C17/38
    • An electronic compass system (100) includes a magnetic sensor circuit (102) having at least two sensing elements (104, 106, 108) for sensing perpendicular components of the Earth’s magnetic field vector. A processing circuit (110) is coupled to the sensor circuit to filter, process, and compute a heading. The processing circuit further selects an approximating geometric pattern, such as a sphere, ellipsoid, ellipse, or circle, determines an error metric of the data points relative to the approximating pattern, adjusts the pattern to minimize the error, thereby obtaining a best fit pattern. The best fit pattern is then used to calculate the heading for each successive sensor reading provided that the noise level is not noisy and until a new best fit pattern is identified. The electronic compass system is particularly well suited for implementation in a vehicle rearview mirror assembly (140).
    • 电子罗盘系统(100)包括具有用于感测地球磁场矢量的垂直分量的至少两个感测元件(104,106,108)的磁传感器电路(102)。 处理电路(110)耦合到传感器电路以过滤,处理和计算航向。 处理电路还选择近似几何图案,例如球体,椭圆体,椭圆或圆形,相对于近似图案确定数据点的误差度量,调整图案以最小化误差,从而获得最佳拟合图案 。 然后,最佳拟合模式用于计算每个连续传感器读数的标题,前提是噪声水平不是很嘈杂,直到确定出新的最佳拟合模式。 电子罗盘系统特别适用于实现在车辆后视镜组件(140)中。