General Electric Company

Lockheed Martin Corporation

Other

Martin Marietta Corporation

David J Murrow

Kai-Bor Yu

Moayyed A Hussain

A painting rack assembly, including a frame portion having a first pair of spaced, parallel elongated members, a second pair of spaced, parallel semi-elongated members connected to the first pair of spaced, parallel elongated members to define a parallelogram further defining a working plane, a respective centered pivotable connector operationally connected to each respective semi-elongated member, and a plurality of fabric connection assemblies operationally connected to and distributed around the parallelogram, and a support assembly operationally connected to the frame portion having a pair of elongated support members, each respective elongated support member connected to a respective pivotable connector at one end and having a connection socket at the other, oppositely disposed end, and a pair of spaced elongated stabilizing members extending orthogonally from each respective elongated support member and oriented parallel to the working plane.

Upright multi-position fabric painting rack

An improvement in monopulse radar achieves nulling of a single mainlobe jammer and multiple sidelobe jammers while maintaining the angle measurement accuracy of the monopulse ratio by cascading a multiple sidelobe canceller and a mainlobe canceller, and imposing a mainlobe maintenance technique during the sidelobe jammer cancellation process so that the results of the sidelobe jammer cancellation process do not distort the subsequent mainlobe cancellation process. In this manner, the sidelobe jammers and the mainlobe jammer are cancelled sequentially in separate processes.

Combining sidelobe canceller and mainlobe canceller for adaptive monopulse radar processing

A radar monopulse signal receiving system according to an aspect of the invention provides sum (&Sgr;) and a single difference (&Dgr;) beam outputs from the beamformer. This is accomplished by encoding the information relating to the azimuth and elevation difference beams onto a single complex number. By comparison with some prior-art arrangements, the number of channels required for processing the signals is reduced. Near the end of the monopulse processing, the quotient is taken of complex number divided by the sum beam information, which directly produces a complex monopulse ratio m&equals;m &plus;jm . The azimuth and elevation monopulse ratios are represented by m and m , respectively.

Monopulse array radar with single difference beam for simultaneous azimuth and elevation angle determination

Monopulse radar operation is improved by nulling a single mainlobe jammer and multiple sidelobe jammers while maintaining the angle measurement accuracy of the monopulse ratio. A sidelobe jammer cancelling adaptive array is cascaded with a mainlobe jammer canceller, imposing a mainlobe maintenance technique or constrained adaptation during the sidelobe jammer cancellation process so that results of the sidelobe jammer cancellation process do not distort the subsequent mainlobe jammer cancellation process. The sidelobe jammers and the mainlobe jammer are thus cancelled sequentially in separate processes.

Adaptive digital beamforming architecture and algorithm for nulling

An improvement in monopulse radar achieves nulling of multiple mainlobe jammers while maintaining the angle measurement accuracy of the monopulse ratio by using multiple simultaneous beams, thereby obtaining the additional degrees of freedom necessary for cancelling more than one mainlobe jammer (MLJ). The beams are placed one null beamwidth apart in order to maintain orthogonality. The MLJs are nulled in the orthogonal direction of the angle estimate giving undistorted monopulse ratios.

Simultaneous multibeam approach for cancelling multiple mainlobe jammers

A nonrectangular antenna aperture is provided comprising four quadrants for receiving electromagnetic signals. The aperture has the capability to form a predetermined sum beam, a predetermined first difference beam, a predetermined second difference beam, and a predetermined double difference beam so that the product of the first and second difference beams is substantially equal to the product of the sum and the double difference beams.

Antenna aperture with mainlobe jammer nulling capability

An antenna beamformer is provided for coupling to a circular antenna aperture comprising a plurality of vertical beamformers and four horizontal beamformers coupled to the vertical beamformers so that each horizontal beamformer has the capability to form a different predetermined electromagnetic field radiation pattern.

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Clifton Park, NY, United States of America

David J Murrow