Other

Communications Satellite Corporation

Interferometrics Incorporated

John E Effland

John C Webber

David B Shaffer

John M Gipson

Amir Ibrahim Zaghloul

Robert M Sorbello

A method and system for unambiguous pre-detection real time measurement of lightning strokes.

Method and system for measuring the position of lightning strokes

The method of locating an unknown radio-frequency transmitter includes: (a) receipt of signals radiated from the transmitter by a plurality of receivers; (b) retransmission of the received signals to a plurality of antennas; (c) performing a time difference of arrival (TDOA) calculation which compensates for a relative delay value, which is a function of the distances from the transmitter to each of the receivers, the distances from each of the receivers to the antennas, and the speed of light; (d) performing a frequency difference of arrival (FDOA) calculation which compensates for a relative frequency value, which is a function of the relative velocity of each receiver with respect to the velocity of the Earth; (e) repeating these steps a plurality of times; and (f) determining the location of the unknown transmitter based on the plurality of TDOA and FDOA calculations.

Method and system for locating an unknown transmitter

A printed-circuit antenna enabling two signals to be received simultaneously. Two layers of radiating elements and corresponding power dividers are provided, one set of power dividers being disposed orthogonally with respect to the other, so as to enable reception of two signals with orthogonal senses of polarization. Either dual linear or dual circular polarization may be achieved through suitable selection of radiating elements. Alternatively, a quadrature hybrid may be coupled, either externally or as an integral part of the antenna, to enable dual circular polarization.

Dual-polarized printed circuit antenna having its elements capacitively

Growing community of inventors

Gaithersburg, MD, United States of America

John E Effland