G - Physics
01
S
343/17
G01S 13/88 (2006.01) G01S 13/76 (2006.01)
Patent
CA 1218134
ABSTRACT A Navigation system includes at least one pulse radar and a number of transponders which when receiving radar pulses transmit high frequency pulse modulated signals. When receiving an interrogating signal from the pulse radar, the transponder transmits a response signal with a delay. The delay is selected in such a manner that the response signal arrives at the pulse radar within a time space lying between the moment when all signal ethos, lying within a definite range, have been received and the moment when the next radar pulse begins. The display scan in the radar is delayed by the same amount as the response signal. In this way, the response signal competes with considerably weaker echo signals than in the case of a non delayed response.
415540
Andersson Bengt L.
Gustavsson Per-Olof G.
Morwing Bo A.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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