William H Kilpatrick

US Patent:

58984020, Apr 27, 1999

Filed:

May 30, 1997

Appl. No.:

8/865929

Inventors:

William Lloyd Kilpatrick - Kennesaw GA

Assignee:

Federal Communications Commission/Compliance and Information
Bureau/Equipment Development Group - Powder Springs GA

International Classification:

G01S 502

US Classification:

342417

Abstract:

This invention relates to a wide aperture radio frequency data acquisition system which collects coherent samples from multiple points in a defined plane at the surface of the ground. The information collected can be processed with suitable algorithms to extract the bearing, frequency, and power spectra of the arriving radio frequency wavefront. This system consists of an antenna system; a multi-channel receiver system incorporating mixers, filters, amplifiers, analog to digital converters, digital down converters; a digital signal processor; and a computer. The electrically short, active antennas with frequency independent response are connected to the multiple channel receiving system, one channel per antenna receiving the signal. The receiver uses two frequency conversion oscillators for coarse but accurate frequency synthesis to convert the received signal's frequency. Then, the signal is converted to a digital signal.

US Patent:

40074617, Feb 8, 1977

Filed:

Sep 5, 1975

Appl. No.:

5/610717

Inventors:

Arthur Luedtke - Marietta GA
William L. Kilpatrick - Austell GA

Assignee:

Field Operations Bureau of the Federal Communications Commission - Washington DC

International Classification:

H01Q 2106

US Classification:

343844

Abstract:

An Isolation Differential Combiner which accepts signals from two spaced vertical whip antenna elements and which are then combined through delay lines so that the resulting said reception pattern is a cardioid signal pattern at the combiner outputs. The isolation of the two signals is accomplished by connecting wide-band balanced transformers as hybrids. The differential component of the two signals present at the hybrid combiner is available at each secondary winding of each wide-band balanced transformer.

US Patent:

40030601, Jan 11, 1977

Filed:

Feb 26, 1975

Appl. No.:

5/553313

Inventors:

Fred L. Broce - Doraville GA
William F. Bentley - Smyrna GA
William L. Kilpatrick - Austell GA

Assignee:

The United States of America as represented by the Federal
Communications Commission - Washington DC

International Classification:

G01S 502

US Classification:

343113PT

Abstract:

A direction finding receiver contained in a hand held portable housing with a ferrite rod antenna mounted in and protruding through the housing so that when the antenna axis points to the radio frequency signal source to be direction found, a null is obtained in the signal level. The antenna is coupled to the receiver circuit which comprises a broadband fixed tuned radio frequency amplifier having low sensitivity, a modulation oscillator used to modulate the broadband fixed tuned rf amplifier by tone injection when a steady carrier is present, a demodulator for demodulating the rf signal, and an audio amplifier for amplifying the demodulated signal.