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    • 6. 发明授权
    • Electronic analogue compass
    • 电子模拟罗盘
    • US6141881A
    • 2000-11-07
    • US185078
    • 1998-11-03
    • Craig A. AyresJohn A. AyresDouglas Hall
    • Craig A. AyresJohn A. AyresDouglas Hall
    • G01C17/28G01C17/02
    • G01C17/28
    • An compass having an electronic magnetic field sensor and an analog directional display is disclosed wherein a signal from the field sensor proportional to one component of the earth's magnetic field is alternated in polarity and integrated to produce a triangular waveform the frequency of which is proportional to the strength of that field component and wherein a triangular waveform having a frequency proportional to the second component of the earth's magnetic field is produced in the same manner. These values are used by a microcontroller to control an air-core gauge such that a disk with reference markings attached to the gauge remains positioned with one of the reference markings facing either magnetic or true north. A resistor ladder network is also connected in parallel to the inputs of the integrators and controlled by the microprocessor through a shift register in order keep the integrators out of saturation.
    • 公开了一种具有电子磁场传感器和模拟方向显示器的罗盘,其中与地球磁场的一个分量成比例的场传感器的信号在极性上交替并且被积分以产生三角波形,其频率与 并且其中以相同的方式产生具有与地球磁场的第二分量成比例的频率的三角形波形的强度。 微控制器使用这些值来控制空气量规,使得具有连接到量规的参考标记的盘保持定位,其中一个参考标记面向磁性或真北。 电阻梯形网络还与积分器的输入端并联连接,并通过移位寄存器由微处理器控制,以保持积分器不饱和。