CATHODE RAY TUBE CENTERED HORIZONTAL SITUATION INDICATOR.
Final rept. Dec 66-Feb 68,
ASTRONAUTICS CORP OF AMERICA MILWAUKEE WI
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The study demonstrated that the electro-mechanical elements in the center section of a Horizontal Situation Indicator HSI could be successfully replaced by electronically generated symbols on a cathode ray tube, thus allowing the HSI to be used as a multi-mode display for future requirements of the Air Force. The course pointer, vertical deviation bar, horizontal deviation bar, and the TOFROM indications were generated by digitally programming an UpDown counter for both the X and Y axis. The outputs were converted to CRT sweep voltages by a digital to analog converter. The generated symbol set was rotated with respect to aircraft heading by resolving the X,Y sweep voltages. A flyable prototype was successfully constructed. Author
- Flight Control and Instrumentation