G - Physics – 01 – S
Patent
G - Physics
01
S
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.
366457
Charas Philippe M.
Gustavsson Per-Olof G.
Morwing Bo A.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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