Digital Compass Having a Ratiometric Bearing Processor.
Patent, Filed 10 May 82, patented 1 Nov 83,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A digital compass is including a two-axis earths 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 andor 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 earths 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 to 90 degrees. The data line outputs from the memory unit defines a quadrant displacement angle in the range of 0 to 90 degrees which is subsequently added to the cardinal point forming the lower boundary in bearing of the host quadrant.
- Target Direction, Range and Position Finding
- Electrical and Electronic Equipment
- Computer Hardware
- Computer Programming and Software