| 摘要 |
A digital compass including a two-axis earth's magnetic field sensor and a bearing processor computes the bearing for local display or transmission from a remote site to a local site for display and/or storage. The bearing processor portion of the digital compass includes an analog-to-digital converter configured for ratiometric measurements to compute the ratio of the x-axis and y-axis signals (smaller divided by the larger) from the aforementioned two-axis earth's magnetic field sensor. A programmable memory unit controlled, inter alia, by the data line outputs of the analog-to-digital converter, contains the arc tangent function for angles from 0 DEG to 90 DEG . The data line outputs from the memory unit defines a quadrant displacement angle in the range of 0 DEG to 90 DEG which is subsequently added to the cardinal point forming the lower boundary in bearing of the host quadrant.
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