Microwave landing system with fail-soft switching of dual...

Details Microwave landing system with fail-soft switching of dual... Microwave landing system with fail-soft switching of dual...

G - Physics

01

S

351/6, 343/73

G01S 1/56 (2006.01) G01S 1/02 (2006.01) H04B 1/74 (2006.01)

Patent

CA 1315862

MICROWAVE LANDING SYSTEM WITH FAIL-SOFT SWITCHING OF DUAL TRANSMITTERS, BEAM STEERING AND SECTOR ANTENNAS ABSTRACT OF THE DISCLOSURE An MLS system having redundant subsystems. Dual signal sources feed dual power dividers. A first switch array selects the power divider to be used and provides the selected signals to an array of phase shifters. A second switch array provides the phase shifted signal, which may be amplified, to either a primary array having elements for radiating a scanning beam or a recombining network having outputs connected to auxiliary antennas. A third switch array provides control signals to the array of phase shifters from either a main beam steering unit or a standby beam steering unit. Alternatively, the dual signal sources feed a single power divider through a circulator. Duplicate auxiliary antennas may be used with antenna switches located before the power dividers or circulator for selectively providing the signals to the auxiliary antennas instead of the primary array.

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