Thomson-csf

Thompson-csf

Andre Champeau

Serge Maclman

This array antenna with anti-jamming in reception for radioelectrical or ultrasound waves is provided with radiating elements fitted out individually or in groups with amplitude-controlled and phase-controlled passive or active modules enabling aiming at transmission as well as at reception by analog beam-forming. It possesses a reception anti-jamming circuit carrying out successively two reduced, adaptive computational beam-forming operations, one in elevation which is performed on a grouping, in horizontal alignments, of the reception signals of the radiating elements and working on the reception signals by modifying the settings of the controlled modules and the other in relative bearing, performed on a grouping, in vertical alignments, of the signals of the radiating elements that which it phase-shifts and adds up to form a reception channel for the total antenna. The reception anti-jamming thus obtained has performance characteristics comparable to those that would result from a full adaptive beam-forming operation. At the same time, it requires a far smaller volume of processing.

Anti-jamming array antenna

This radiating-element array antenna has its radiating elements grouped together, in reception, in two sets of parallel linear sub-arrays imbricated and oriented in the two directions, namely the horizontal and vertical directions. It comprises two beam-shaping circuits each receiving the signals from one of the sets of linear sub-arrays and carrying out two reduced beam-shaping operations, one in the elevation plane and other in the relative bearing plane, and one output circuit delivering a reception signal from a non-linear combination, a product or convolution, of the two reduced beam-shaping signals generated by the beam-shaping circuits. This reception signal simulates the signal of an antenna with total beam-shaping in the two planes, namely the elevation and relative bearing planes.

Radiating-element array antenna

This antenna system has a plurality of elementary antennas configured into an array, wherein there is a reception (or transmission) channel associated with each antenna or sub-array of antennas, said reception channel having, in series:

Pointing control for antenna system with electronic scannning and

A semi-rigid cable for the transmission of microwaves, such as those used for radar or for digital television. This cable has a symmetrical strip line with a dielectric having an almost rectangular section, with a width close to the thickness of the dielectric and external conductive strips with a width that is substantially greater than that of the central conductor. This symmetrical strip line is advantageously surrounded by an absorbent sheath. The entire unit is protected by an ordinary metallic shielding and by a standard external mechanical protective sheath.

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Orsay, France

Andre Champeau