Alphonso A Samuel

US Patent:

6750804, Jun 15, 2004

Filed:

Apr 4, 2002

Appl. No.:

10/116438

Inventors:

Harry A. Schmitt - Tucson AZ
George T. David - late of Oro Valley AZ
Dennis C. Braunreiter - Oro Valley AZ
Alphonso A. Samuel - Tucson AZ

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 7292

US Classification:

342 89, 342 94, 342118, 342134, 342135, 342136, 342149, 342159, 342175, 342194, 342195, 342196, 356 3, 356 401

Abstract:

A system and method for detecting a target. The inventive method includes the steps of receiving a complex return signal of an electromagnetic pulse having a real and an imaginary component; extracting from the imaginary component information representative of the phase component of the return signal; and utilizing the phase component to detect the target. Specifically, the phase components are those found from the complex range-Doppler map. More specific embodiments further include the steps of determining a power spectral density of the phase component of the return signal; performing a cross-correlation of power spectral density of the phase component of the return signal between different antenna-subarray (quadrant channels); and averaging the cross-correlated power spectral density of the low frequency components. In an alternative embodiment, the cross-correlation is performed on the phase component of the range-Doppler map directly. This signal can then be averaged to potentially provide improved detection of targets.

US Patent:

7046188, May 16, 2006

Filed:

Aug 14, 2003

Appl. No.:

10/640993

Inventors:

David A. Zaugg - Tucson AZ, US
Alphonso A. Samuel - Tucson AZ, US
Donald E. Waagen - Tucson AZ, US
Harry A. Schmitt - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 13/526
G01S 13/18
G01S 13/528

US Classification:

342 95, 342 89, 342 94, 342159, 342160, 342163, 342175, 342195

Abstract:

Systems and methods of tracking a beam-aspect target are provided. In embodiments, a target is tracked with a Kalman filter while detections are received. After a detection is missed, the Kalman filter may be concurrently propagated with a blind-zone particle filter until a probability that the target is in a blind zone exceeds a threshold. When the probability exceeds the threshold, the Kalman filter may refrain from further propagating. After a gated detection is received, the blind-zone particle filter and an unrestricted-zone particle filter may be concurrently propagated while a probability that the target is in an unrestricted zone exceeds a threshold. The system may return to tracking with the Kalman filter when a covariance of the unrestricted-zone particle filter falls below a predetermined covariance.

US Patent:

8416127, Apr 9, 2013

Filed:

Mar 31, 2011

Appl. No.:

13/076816

Inventors:

Glafkos K. Stratis - Lake Worth FL, US
Alphonso A. Samuel - Tucson AZ, US
Salvatore Bellofiore - Vail AZ, US
David J. Knapp - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 7/40

US Classification:

342174, 342188, 342 62

Abstract:

A missile radar system includes a tapered radome covering a front face of a main antenna. A calibration antenna is the combination of a metal tip and an attached one or more radiating or excitation elements (monopole) on the tip. A narrow end (wedge) of the radome may aid in directing planar calibration waves toward the main antenna. The metal tip has a curved inner surface that acts, with the attached radiating element(s), as an aperture antenna. Signals are emitted from the calibration antenna back toward the front face of the main antenna. The signals pass from the tip/reflector to the front face of the main antenna through a substantially-metal-free and substantially-dielectric-free volume defined by the inner surface of the radome. The radar system allows for calibration of the antenna prior to launch and/or during flight of the missile.

US Patent:

8471758, Jun 25, 2013

Filed:

Feb 10, 2011

Appl. No.:

13/024957

Inventors:

Alphonso A. Samuel - Tucson AZ, US
Robert M. Pawloski - Tucson AZ, US
Nathan A. Goodman - Oro Valley AZ, US

Assignee:

Raytheon Company - Waltham MA
The Arizona Board of Regents on behalf of the University of Arizona - Tucson AZ

International Classification:

F41G 7/28
G01S 13/90

US Classification:

342 62, 342 25 A

Abstract:

Virtual Aperture Radar (VAR) imaging provides terminal phase radar imaging for an airborne weapon that can resolve multiple closely-spaced or highly correlated scatterers on a given target with a single pulse to provide an aimpoint update at a useful range to target without training data and without requiring a large aperture antenna. VAR imaging exploits the sparse, dominant-scatterer nature of man-made targets. The array manifold is constructed with a large number of basis functions that are parameterized by range or angle (or both) to target. The number of basis functions extends the capability to resolve scatterers beyond the Rayleigh resolution. However, this also makes the manifold underdetermined. A sparse reconstruction technique that places a sparsity constraint on the number of scatterers is used to solve the manifold to uniquely identify the ranges or angles to the scatterers on the target. These updates are passed to the weapon's guidance system, which in turn generates command signals to actuate aerodynamic surfaces such as fins or canards to steer the weapon to the target.

US Patent:

20120249357, Oct 4, 2012

Filed:

Mar 31, 2011

Appl. No.:

13/076836

Inventors:

Glafkos K. Stratis - Lake Worth FL, US
Alphonso A. Samuel - Tucson AZ, US
Salvatore Bellofiore - Vail AZ, US
David J. Knapp - Tucson AZ, US

International Classification:

G01S 13/00

US Classification:

342 54, 342 62

Abstract:

A missile includes a radar system that has a radome through which a main antenna sends and receives signals. The radome includes a radome body and a radome tip include different transmissive materials, with for example the radome body primarily made of a lossy optically nontransparent material, and the radome tip primarily made of a lossless (permittivity with low imaginary part) glass material that may also be optically transparent. A laser may be used in conjunction with the radome to send and receive encoded signals. The laser may be located behind (aft of) the main antenna, and one or more optical fibers may extend into and/or along the radome to guide laser signals to the radome tip. The laser may be used to emit encoded signals so as to allow multiple radar systems operating in the same area at the same time to discriminate between different targets.

US Patent:

6531989, Mar 11, 2003

Filed:

Nov 14, 2001

Appl. No.:

09/992755

Inventors:

Delmar L. Barker - Tuscon AZ
Harry A. Schmitt - Tucson AZ
David J. Knapp - Tucson AZ
Dennis C. Braunreiter - Oro Valley AZ
Alphonso A. Samuel - Tucson AZ
Steven Schultz - Tucson AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01Q 142

US Classification:

343753, 343703, 343705

Abstract:

A radar antenna for a guided missile is calibrated in flight using a point source of microwave radiation and a lens to emulate a far field source. The microwave source and lens fit behind a metal cap at the leading end of the radome and so do not adversely affect the radar. A variety of techniques to power the point source are disclosed, and a variety of lens arrangements are disclosed. The invention allows a radar antenna to be calibrated in flight, and so insures against mis-calibration due to aging components as well as the heat and mechanical forces associated with storage and/or launch of the missile.

US Patent:

20180222825, Aug 9, 2018

Filed:

Feb 6, 2017

Appl. No.:

15/425141

Inventors:

- Waltham MA, US
Teresa J. Clement - Tucson AZ, US
Glafkos K. Stratis - Tucson AZ, US
Alphonso A. Samuel - Tucson AZ, US
Alex Dely - Tucson AZ, US
Wayne L. Sunne - Tucson AZ, US

International Classification:

C07C 13/62

Abstract:

A support structure for a reconfigurable molecule includes a first support portion having a first mounting region; a second support portion having a second mounting region; and a rotatable molecule anchored between the first support portion and the second support portion on the first mounting region and the second mounting region, the rotatable molecule having an internal rotational axis extending from the first mounting region to the second mounting region; wherein the first support portion and the second support portion are mirror images of one another.

US Patent:

20180222826, Aug 9, 2018

Filed:

Feb 6, 2017

Appl. No.:

15/425101

Inventors:

- Waltham MA, US
Teresa J. Clement - Tucson AZ, US
Glafkos K. Stratis - Tucson AZ, US
Alphonso A. Samuel - Tucson AZ, US
Alex Dely - Tucson AZ, US
Wayne L. Sunne - Tucson AZ, US

International Classification:

C07C 15/60
G02F 1/00
H01Q 15/00
C07F 9/12
C07C 255/34

Abstract:

A reconfigurable polar molecule includes a symmetric nonpolar molecule portion having an elongated shape defined by a longitudinal axis and lateral axis, the longitudinal axis being longer than the lateral axis; a positive ionically charged group at a first end and a negative ionically charged group at a second end of the longitudinal axis, the positive and negative ionically charged groups forming a permanent dipole; a first bridging group and a second bridging group on opposing ends of the lateral axis, the first and second bridging groups being linear nonpolar groups; and a first support portion bonded to the first bridging group, and a second support portion bonded to the second bridging group, the first bridging group and the second bridging group being nonpolar and having structures that enable free rotation of the symmetric nonpolar molecule portion through the first bridging group and the second bridging group.