Inventors:
Ralph Markson - Weston MA
James W. Warwick - Boulder CO
Arthur Uhlir - Weston MA
Assignee:
Airborne Research Associates, Inc. - Weston MA
International Classification:
G01J 302
Abstract:
The lightning ranging system for determining distance between a lightning discharge and an airborne object includes a receiver on the airborne object adapted to receive electromagnetic radiation signals generated by a lightning discharge along both a direct and a surface reflected path. Signal processing apparatus is interconnected with the receiver for determining the difference in the time of arrival of the direct and reflected signals. A computer is provided to calculate the range of the lightning discharge from the difference in the time of arrival of the direct and reflected signals. In a preferred embodiment, the signal processing apparatus is digital and includes at least a 10-bit analog-to-digital converter with at least a 36 megahertz sampling rate.