Microwave landing system with protection against jamming

Details Microwave landing system with protection against jamming Microwave landing system with protection against jamming

G - Physics

01

S

343/75

G01S 1/04 (2006.01) G01S 1/56 (2006.01) H01Q 3/26 (2006.01)

Patent

CA 1224261

ABSTRACT OF THE DISCLOSURE In a microwave landing system or MLS, the bearing and/or elevation angular messages are in two parts a preamble transmitted by a sector antenna and a specific message transmitted by an electronic scan or scanning beam antenna. As the gain of the sector antenna is below that of the scanning beam antenna, the preamble is much more vulnerable to scanning than the message. According to the invention, a preamble is transmitted, which is reinforced in a narrow angular sector and movable so as to cover the sector covered by the sector antenna by superimposing the radiation patterns of the sector antenna and the scanning beam antenna in said direction. (Fig 6). -18-

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