Accession Number : ADD013553

Title :   Digital Compass Having a Ratiometric Bearing Processor.

Descriptive Note : Patent, Filed 10 May 82, patented 1 Nov 83,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Lenko, Daniel S

Report Date : 01 Nov 1983

Pagination or Media Count : 21

Abstract : A digital compass is 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 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.

Descriptors :   *ANALOG TO DIGITAL CONVERTERS, *COMPASSES, *COMPUTER PROGRAMMING, *DATA TRANSMISSION SYSTEMS, *DIGITAL SYSTEMS, *PATENTS, *PROCESSING EQUIPMENT, ANGLES, BOUNDARIES, DATA PROCESSING, DISPLACEMENT, MEMORY DEVICES, OUTPUT, QUADRANTS, REMOTE AREAS, SITES, STORAGE

Subject Categories : Target Direction, Range and Position Finding
      Electrical and Electronic Equipment
      Computer Hardware
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE