Gayle Patrick Martin

US Patent:

6384773, May 7, 2002

Filed:

Dec 15, 2000

Appl. No.:

09/737707

Inventors:

Gayle Patrick Martin - Merritt Island FL
John Shipley - Sebastian FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G01S 1300

US Classification:

342202, 342 21, 342 82, 342159, 342175, 455 63, 375130, 375139, 375140, 375146

Abstract:

Identity transform filters, such as sin(x)/x filters, are used to coherently fragment the frequency continuum of a wideband waveform, such as an ultra wideband radar signal, into a plurality of spectral segments that are capable of fitting into unoccupied spectral regions of a partially occupied electromagnetic spectrum. The wideband waveform has a bandwidth that falls within the partially occupied portion of the electromagnetic spectrum, and exceeds that of any unoccupied spectral region. The total useable bandwidth of the unoccupied regions is at least equal to that of the wideband waveform.

US Patent:

6397083, May 28, 2002

Filed:

Feb 13, 2001

Appl. No.:

09/782767

Inventors:

Gayle Patrick Martin - Merritt Island FL
Steven D. Halford - Melbourne FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H04B 138

US Classification:

455562, 4552772, 4552781, 342378, 342380, 342381, 342383

Abstract:

Weighting coefficients for a phased array antenna are iteratively refined to optimal values by a âbootstrappedâ process that starts with a coarse set of weighting coefficients, to which received signals are subjected, to produce a first set of signal estimates. These estimates and the received signals are iteratively processed a prescribed number of times to refine the weighting coefficients, such that the gain and/or nulls of antennas directivity pattern will maximize the signal to noise ratio. Such improved functionality is particularly useful in association with the phased array antenna of a base station of a time division multiple access (TDMA) cellular communication system, where it is necessary to cancel interference from co-channel users located in cells adjacent to the cell containing a desired user and the base station.

US Patent:

6411612, Jun 25, 2002

Filed:

May 19, 1998

Appl. No.:

09/081287

Inventors:

Karen W. Halford - Melbourne FL
Gayle Patrick Martin - Merritt Island FL
Julian Bartow Willingham - Melbourne FL
Mark A. Webster - Palm Bay FL
Gregory S. Sinclair - Indian Harbour Beach FL

Assignee:

Harris Communication - Melbourne FL

International Classification:

H04B 7212

US Classification:

370347, 455562, 4552781

Abstract:

A base station signal processing mechanism for a time division multiple access (TDMA) cellular communication system adaptively controls weighting coefficients of the base stations phased array antenna in a manner that forms a directivity pattern whose gain and/or nulls maximize the signal to noise ratio in the presence of co-channel users whose communication time slots overlap a communication time slot of a desired user. The signal processing mechanism performs correlation processing of synchronization patterns contained in signals transmitted by co-channel users to identify times of transitions between successive co-channel users communication time slots relative to a time of transition of the desired users communication time slot, and deriving weighting coefficients in accordance with the times of transitions.

US Patent:

6700527, Mar 2, 2004

Filed:

Nov 15, 2000

Appl. No.:

09/713378

Inventors:

Gayle Patrick Martin - Merritt Island FL
John W. Shipley - Sebastian FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G01S 1390

US Classification:

342 25, 342173, 342174, 342191, 342192, 455 121, 4552261, 455427

Abstract:

An imaging system uses wideband âRF daylightâ created by plural narrowband RF illumination sources, to passively generate spectrally different sets of RF scattering coefficients for multiple points within a prescribed three-dimensional volume being illuminated by the narrowband RF transmitters. To correct for the lack of mutual coherence among different RF illumination sources, the respective sets of scattering coefficient data are applied to a cultural feature extraction operator, to locate one or more strong cultural features spatially common to multiple images. For spatial points along the extracted cultural feature theoretical scattering coefficients are calculated. Differences between phase values of these calculated scattering coefficients and those of the collected and processed scattering energy are used to modify the measured scattering coefficient values for all spatial points in the illuminated region. This allows the scattering coefficients of that narrowband frequency set to be coherently combined with those of another spectrally different narrowband set of scattering coefficients whose phase components have been similarly corrected, based upon the same extracted cultural feature.

US Patent:

6708032, Mar 16, 2004

Filed:

May 24, 2001

Appl. No.:

09/866343

Inventors:

Julian Bartow Willingham - Melbourne FL
Gayle Patrick Martin - Merritt Island FL
Gates H. Fortier - Calgary, CA
Joseph A. Brasic - Cochrone, CA

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H04Q 720

US Classification:

455436, 455438, 455439, 455442

Abstract:

A channel hand-off control mechanism for a cellular communication network uses the same channels employed for communications between base stations of adjacent cells and a mobile transceiver, as the mobile transceiver moves between those cells, in order to locate the mobile transceiver relative to the base stations, so that the acquiring base station may readily place a narrowbeam channel on the mobile transceiver at hand-off. Each base station employs a phased array antenna, which allows the base station to controllably define its antenna coverage pattern with respect to any mobile transceiver, so as to minimize interference from one or more other transceivers, reducing frequency reuse distance.

US Patent:

6917784, Jul 12, 2005

Filed:

Sep 17, 2003

Appl. No.:

10/664193

Inventors:

Gayle Patrick Martin - Merritt Island FL, US
John W. Shipley - Sebastian FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H04H001/00

US Classification:

455 302, 455 121, 4554261, 455427, 342 25, 342173, 342174, 342191, 342192

Abstract:

An imaging system uses ‘RF daylight’ created by an RF illumination source, such as a television broadcast tower, to passively generate RF scattering coefficients for multiple points within a prescribed three-dimensional volume being illuminated by the RF transmitter. The scattering coefficients provide a complex interference pattern having amplitude and phase components that contain all information necessary to recreate a three-dimensional monochromatic image of the illuminated scene. Coherent complex correlation provides scene information content that is only a function of scene scattering and collector geometry. The scene information may be coupled to an image utility subsystem, such as a virtual reality simulator, for generation of a three-dimensional image of the illuminated scene.

US Patent:

6931362, Aug 16, 2005

Filed:

Nov 17, 2003

Appl. No.:

10/713107

Inventors:

Edward Ray Beadle - Melbourne FL, US
Richard Hugh Anderson - Melbourne FL, US
John Fitzgerald Dishman - Palm Bay FL, US
Paul David Anderson - Melbourne FL, US
Gayle Patrick Martin - Merritt Island FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G06F015/00

US Classification:

702190, 702189

Abstract:

A technique for blind source separation (“BSS”) of statistically independent signals with low signal-to-noise plus interference ratios under a narrowband assumption utilizing cumulants in conjunction with spectral estimation of the signal subspace to perform the blind separation is disclosed. The BSS technique utilizes a higher-order statistical method, specifically fourth-order cumulants, with the generalized eigen analysis of a matrix-pencil to blindly separate a linear mixture of unknown, statistically independent, stationary narrowband signals at a low signal-to-noise plus interference ratio having the capability to separate signals in spatially and/or temporally correlated Gaussian noise. The disclosed BSS technique separates low-SNR co-channel sources for observations using an arbitrary un-calibrated sensor array. The disclosed BSS technique forms a separation matrix with hybrid matrix-pencil adaptive array weights that minimize the mean squared errors due to both interference emitters and Gaussian noise.

US Patent:

7068219, Jun 27, 2006

Filed:

Jun 10, 2004

Appl. No.:

10/864922

Inventors:

Gayle Patrick Martin - Merritt Island FL, US
Harry Richard Phelan - Palm Bay FL, US
Mark Larry Goldstein - Palm Bay FL, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

H01Q 3/24

US Classification:

342372

Abstract:

A phased array antenna may include a plurality of antenna elements, at least one respective phase shifter connected to each antenna element, and at least one respective gain element connected to each antenna element. The phased array antenna may further include at least one controller for determining and controlling both phases and gains of the phase shifters and gain elements, respectively, to provide beamsteering in a first direction for a signal of interest. The controller may also iteratively determine and control phases of the phase shifters to provide a null in a second direction for a signal not of interest, and without determining or controlling gains of the gain elements.