Determining azimuth of a transponder by measuring a plurality of

Details Determining azimuth of a transponder by measuring a plurality of Determining azimuth of a transponder by measuring a plurality of

1981-04-22

1984-08-07

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 75, 343 175, G01S 346, G01S 1378

Patent

active

044646623

ABSTRACT:
A method for determining the azimuth .alpha. of a transponder relative to a radar system which transmits a frequency F varying linearly with time. The system comprises two receiving antennas disposed at a distance d from each other and produces two beat signals Fb.sub.1 and Fb.sub.2, formed by mixing the transmitted wave with each of the two echo waves received from the transponder. The phase shift .phi. between Fb.sub.1 and Fb.sub.2 at a first time t, and frequency f, and the phase shift .phi.'.sub.o at a second time t.sub.2 and frequency f.sub.2 is measured, and the overall phase shift .phi. between Fb.sub.1 and Fb.sub.2 is calculated. The value of .alpha. is calculated from the values F.sub.1, d and .phi..

REFERENCES:
patent: 4110754 (1978-08-01), Endo

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