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    • 3. 发明授权
    • Electronic compass system
    • 电子罗盘系统
    • US07379814B2
    • 2008-05-27
    • US11842481
    • 2007-08-21
    • Harold C. OckerseJon H. BechtelMark D. Bugno
    • Harold C. OckerseJon H. BechtelMark D. Bugno
    • G01C21/00G01C17/28
    • G01C17/28G01C17/30G01C17/38
    • An electronic compass system includes a magnetic sensor circuit having at least two sensing elements for sensing perpendicular components of the Earth's magnetic field vector. A processing circuit is coupled to the sensor circuit to filter, process, and compute a heading. The processing circuit may determine whether too much noise is present in the output signals received from said magnetic sensor circuit as a function of the relative strength of the Earth's magnetic field vector. The magnetic sensor circuit may include three magnetic field sensing elements contained in a common integrated package having a plurality of leads extending therefrom for mounting to a circuit board. The sensing elements need not be perpendicular to each other or parallel or perpendicular with the circuit board. The electronic compass system is particularly well suited for implementation in a vehicle rearview mirror assembly.
    • 电子罗盘系统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的磁传感器电路。 处理电路耦合到传感器电路以过滤,处理和计算标题。 处理电路可以确定从所述磁传感器电路接收的输出信号中是否存在过多的噪声作为地球磁场矢量的相对强度的函数。 磁传感器电路可以包括三个磁场感测元件,其包含在具有从其延伸的多个引线的公共集成封装中,用于安装到电路板。 感测元件不需要彼此垂直或与电路板平行或垂直。 电子罗盘系统特别适用于车辆后视镜组件中的实施。
    • 5. 发明授权
    • Electronic compass system
    • 电子罗盘系统
    • US06968273B2
    • 2005-11-22
    • US10210910
    • 2002-08-02
    • Harold C. OckerseJon H. BechtelMark D. Bugno
    • Harold C. OckerseJon H. BechtelMark D. Bugno
    • G01C17/30G01C17/38G01C21/00
    • G01C17/30G01C17/38
    • An electronic compass system includes a magnetic sensor circuit having at least two sensing elements for sensing perpendicular components of the Earth's magnetic field vector. A processing circuit 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.
    • 电子罗盘系统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的磁传感器电路。 处理电路耦合到传感器电路以过滤,处理和计算标题。 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,直到识别出新的最佳拟合模式。 电子罗盘系统特别适用于车辆后视镜组件中的实施。