Thomas M Mcgrath

US Patent:

7480688, Jan 20, 2009

Filed:

Nov 30, 2005

Appl. No.:

11/289783

Inventors:

Jeffrey L. Meckley - Glenville PA, US
Thomas P. McGrath - Lutherville MD, US
William F. McClelland - Finksburg MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

G06G 1/02

US Classification:

708271

Abstract:

A phase persistent agile signal source method, apparatus, and/or computer program product provides a direct digital synthesizer (DDS) clock rate, provides a frequency tuning word (FTW) for a desired output frequency, provides a DDS update for a desired DDS update rate, provides an equivalent frequency least significant bit (LSB) for the desired DDS update rate, provides a current phase of an LSB accumulator, and generates a coherent phase of the desired output frequency based on the DDS clock rate, FTW, DDS update rate to the DDS, equivalent LSB for the desired DDS update rate, and current phase of the LSB accumulator. The coherent phase can be the fraction portion of the result obtained from the multiplication of the FTW and the current phase of the LSB accumulator.

US Patent:

7801502, Sep 21, 2010

Filed:

Dec 18, 2006

Appl. No.:

11/640364

Inventors:

James J. Jaklitsch - Parkton MD, US
Jay Markey - York PA, US
Thomas P. McGrath - Lutherville MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

H04B 1/16

US Classification:

4552261, 342174

Abstract:

A method of providing an integrated approach to automated system alignment is set forth, which may include in an exemplary embodiment: providing amplifier compression alignment, (which may include characterizing and/or compensating for a parasitic effect); providing continuous internal alignment of phase and amplitude of a synthetic stimulus instrument (SSI) output signal; providing external measurement port alignment; and providing transfer alignment of internal measurement paths. According to another exemplary embodiment, a receiver apparatus may include: a dual-channel coherent measurement receiver which may include at least one internal channel operative to measure time-division-multiplexed (TDM) feedback signals from each signal source of a synthetic stimulus instrument (SSI); and at least one external channel operative to make direct measurement at an external alignment port output.

US Patent:

7904043, Mar 8, 2011

Filed:

Feb 4, 2010

Appl. No.:

12/700275

Inventors:

James J. Jaklitsch - Parkton MD, US
Jay Markey - York PA, US
Thomas P. McGrath - Lutherville MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

H04B 17/00

US Classification:

4552262

Abstract:

A method for using a “B” channel of a dual channel measurement receiver as a transfer standard for power measurement, which may include in an exemplary embodiment: correlating measurements made with an “A” channel to measurements made with an RF Power Meter on one RF signal source, so that readings from the “A” channel are aligned to the RF Power Meter; aligning the “B” Channel to the “A” Channel (Transfer alignment of Channel B to the RF Power Meter), once the “A” channel has been aligned to read the same as the RF Power Meter; and using the “B” Channel as a transfer standard to measure all remaining RF signal sources in the system, on a time-line much faster than may be accomplished using a power meter.

US Patent:

8170514, May 1, 2012

Filed:

Mar 4, 2011

Appl. No.:

13/040635

Inventors:

James J. Jaklitsch - Parkton MD, US
Jay Markey - York PA, US
Thomas P. McGrath - Lutherville MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

H04B 17/00

US Classification:

4552262

Abstract:

A method for using a “B” channel of a dual channel measurement receiver as a transfer standard for power measurement, which may include, in an exemplary embodiment, correlating a measurement made with an “A” channel of the dual channel measurement receiver to a measurement made with an RF Power Meter on one RF signal source, so that readings from the “A” channel are aligned to the RF Power Meter; aligning the “B” Channel to the “A” Channel, once the “A” channel has been aligned to read the same as the RF Power Meter; and using the “B” Channel as a transfer standard to measure all remaining RF signal sources in the system.

US Patent:

8406718, Mar 26, 2013

Filed:

Feb 4, 2010

Appl. No.:

12/700269

Inventors:

James J. Jaklitsch - Parkton MD, US
Jay Markey - York PA, US
Thomas P. McGrath - Lutherville MD, US

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

H04B 17/00

US Classification:

4552261, 324 7612

Abstract:

A method for characterizing the effect of each step attenuator state, on phase and amplitude, which may include in an exemplary embodiment: activating each step attenuator state as the sole contributor to attenuation, and measuring at least one of a step attenuator amplitude contribution (SAAC) and/or a step attenuator phase contribution (SAPC).

US Patent:

55868878, Dec 24, 1996

Filed:

Nov 23, 1994

Appl. No.:

8/346289

Inventors:

Niall B. McNelis - Baltimore MD
Richard W. Doyle - Fallston MD
Dale A. Clark - Parkton MD
Larry A. Zeafla - Baltimore MD
Thomas P. McGrath - Lutherville MD

Assignee:

AAI Corporation - Hunt Valley MD

International Classification:

F41G 326

US Classification:

434 20

Abstract:

A training apparatus, method and kit for remotely and substantially instantaneously evaluating the alignment, settings and levels of the aiming devices of a howitzer gun. The apparatus includes a video camera for manually removably attaching to the pantel and receiving the sight picture in the pantel or displaying a sight picture in a pantel eyepiece, a pantel deflection setting encoder for manually removably attaching to a pantel deflection setting device and encoding signals responsive to the pantel deflection setting, a pantel level encoder for manually removably attaching to the pantel and encoding signals responsive to the pantel level, a quadrant setting encoder for manually removably attaching to the quadrant setting device and encoding a signal responsive to the quadrant setting, a quadrant level encoder for manually removably attaching to the quadrant and encoding signals responsive to a quadrant level, and a data processing computer for receiving and analyzing the sight picture, or displaying or controlling a synthetic sight picture in a pantel eyepiece, for receiving the signals and for evaluation of the alignment, settings and levels.