Raytheon Company

Raytheon Canada Limited

Peter R Drake

Yuchoi Francis Lok

Yueh-Chi Chang

Eli Brookner

Philip R Merrill, Deceased

Thomas M O'Leary

Thomas V Sikina

Anthony M Ponsford

Leon Green

Jian Wang

James R Myers

Cynthia R Nelson Konen

Chad E Boyack

Keith R Kessler

James E Faoro

Jacqueline M Bourgeois

George R Cunnington

Daniel F Rypysc

Eric G Rolfe

Peter L Hoover

Francis Hartwich

Steven N Peterson

Bradley Fournier

Yuchoi F Lok

Kevin A Paulson

A radar system uses a rotating antenna array having rows that display dispersive properties while feeding multiple radiating elements. In some embodiments, the radiating elements are dual polarized. In at least one embodiment, beam spoiling may be used to generate an unfocused transmit beam that covers an entire elevation range of interest. Digital beam forming may be used during a receive mode to achieve a stack of narrow-width receive beams in elevation. Frequency scanning may also be used to achieve stacked beams in azimuth.

Phased array antenna using stacked beams in elevation and azimuth

Methods and apparatus for a phase array radar system having a fragmented array. In one embodiment, subarrays forming a generally rectangular shape are disposed on the surface of a truncated cone or a dome so that gaps are formed between adjacent segments of subarrays or between every adjacent subarrays.

Methods and apparatus for fragmented phased array radar

Methods and apparatus for combining radar signals of a two-dimensional primary radar covering a surveillance area and a passive adjunct radar to provide three-dimensional data for targets and weather. In exemplary embodiments, high beam and low beam data from the primary radar and elevation data from the adjunct radar can be used to mitigate interference from clutter, such as wind farms.

Methods and apparatus for 3D radar data from 2D primary surveillance radar and passive adjunct radar

Methods and apparatus for a first radar; identifying a blind spot in coverage of the first radar; providing a second radar to illuminate the blind spot, and merging data from the first and second radars using target classification prior to tracking to reduce false targets. In one embodiment, polarimetric data is used to classify targets.

Methods and apparatus for integration of distributed sensors and airport surveillance radar to mitigate blind spots

Methods and apparatus for an ADS-B system having a single link for communication and/or ADS-B/Mode-S coordination. With this arrangement, the system communication is efficiently used.

Methods and apparatus for coordinating ADS-B with mode S SSR and/or having single link communication

Methods and apparatus for processing data from a low beam channel, a high beam channel and a weather channel to perform an altitude estimation based upon a target amplitude ratio between the low beam channel and the high beam channel and target range, and for performing target detection based upon data from the weather channel. In one embodiment, migrating birds can be more accurately detected and classified than with conventional systems.

Methods and apparatus for detection/classification of radar targets including birds and other hazards

A method for operating a microwave amplifier wherein a packaging arrangement is provided. The packaging arrangement includes: (i) a mounting thermally conducting mounting flange; (ii) an isomorphic, thermally conductive material disposed on the flange; (iii) a circuit comprising a semiconductor chip having a transistor arranged as the amplifier, such amplifier being adapted to operate at a nominal microwave frequency with a band of frequencies, disposed on a portion of a surface of the isomorphic, thermally conductive material, other surface portions of the thermally conductive material extending laterally beyond the portion of the material having the semiconductor chip disposed thereon; (iv) a corral having an aperture through an inner region thereof, the isothermal material being disposed within the aperture, such corral having an outer region thereon mounted to surface portions of the flange. The amplifier is biased for Class C operation. The method includes feeding pulsed microwave signals to the amplifier for amplification thereby. The pulses have pulse widths greater than 750 microseconds and have a duty cycle of about 25 percent or more. Thus, the amplifier is now able to operate with a substantially continuous wave input signal.

High power microwave transistor amplifier

Spurious frequencies are suppressed in a transmitter by an RF pulse fall time controller circuit comprising a quadrature hybrid matched attenuator located between a predriver and the first stage of class 'C' driver amplifiers. The circuit linearly attenuates RF pulses and slows pulse fall time. Operation of the circuit is initiated when the rising edge of a pretrigger starts a pretrigger generator which then triggers the application of current bias to the attenuator circuit. After a controlled period of time, the circuit decreases the forward current bias of PIN diodes in the attenuator thereby increasing the diodes' series resistance and increasing the attenuation of the RF pulses. This creates a slow pulse fall time thereby suppressing spurious emissions caused by parasitic ringing of the cascaded Class C common base transistor amplifiers in the transmitter.

Spurious frequency suppressor

Growing community of inventors

Northborough, MA, United States of America

Peter R Drake