Kenneth Ray Rutherford

US Patent:

39493938, Apr 6, 1976

Filed:

Aug 16, 1974

Appl. No.:

5/497964

Inventors:

Gary L. Bjornsen - Marion IA
Kenneth R. Rutherford - Cedar Rapids IA

Assignee:

Rockwell International Corporation - El Segundo CA

International Classification:

H03K 1300

US Classification:

340347CC

Abstract:

A method and means for employing digital means to calibrate an analog sweep waveform in a range determining system. The method imparts digital accuracy in maintaining the voltage-distance analog of the sweep waveform by generating a clock defined strobe at a time when the sweep voltage should reach a reference voltage level, comparing at strobe time the sweep voltage with a precision voltage source of reference level, and correcting the slope of the sweep voltage in accordance with any discrepancy existing at the time of comparison.