Interferometric lightning ranging system

Details Interferometric lightning ranging system Interferometric lightning ranging system

1989-10-24

1990-11-20

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

342453, H01Q 300

Patent

active

049721950

ABSTRACT:
The lightning range 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.

REFERENCES:
patent: 3369240 (1968-02-01), Leary
patent: 3483559 (1969-12-01), Korzekwa et al.
patent: 3727225 (1973-04-01), Adrian
patent: 4463357 (1984-07-01), MacDoran
patent: 4543580 (1985-09-01), Bent et al.
patent: 4684951 (1987-08-01), Baumer
patent: 4746924 (1988-05-01), Lightfoot
Abramovitz, Passive Surveillance Applications of Acousto-Optic Processors, SPIE vol. 545, Optical Technology for Microwave Applications II (1985) pp. 102-107.
Abramovitz, Acousto-Optic Processors for Passive Surveillance, SPIE, vol. 519, Analog Optical Processing and Computing (1984), pp. 2-8.
"Airborne Lightning RF Direction Finding: A Feasibility Study", Craig O. Hayenga, Final Report, Air Force Geophysics Laboratory, AFGL-TR-85-0311, Nov. 1985.

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