Method to prevent a radar beacon respond to received radar...

G - Physics – 01 – S

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343/17

G01S 13/78 (2006.01) G01S 13/76 (2006.01)

Patent

CA 1159932

ABSTRACT OF THE DISCLOSURE A method of preventing a radar beacon from responding to received pulses from a vessel which originate from the side lobes of the vessel antenna. The carrier frequency of the radar signal pulses to and received by the beacon is measured and a value of this frequency is stored when the amplitudes of the signal pulses exceed a certain high threshold level (Th). If signals after that are received which exceed a low threshold level (Tl) (but not the high) the carrier frequency of these is measured and the corresponding value is stored. Measuring two subsequent and equal carrier frequencies is consid- ered as a criterion that a responding signal from the beacon responding to the second received signal should not be transmitted.

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