Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-07-30
1983-06-21
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5SA, G01S 1360
Patent
active
043896480
ABSTRACT:
In a Doppler radar system any one received signal contains components having different Doppler frequencies. This is because the received signal is derived from reflections off a range of different positions within the beamwidth of the system.
It is often only that frequency component which is derived from a reflection along the boresight of the system which is of interest. Difficulty arises in determining which component this is. Because of variations of the reflective properties of the surface from which the reflections are received, it cannot correctly be assumed to be the strongest component.
The invention identifies the components of the received signals derived from reflections along the boresight of the system by analyzing each of two signals received at different times, into components having different Doppler shifts. Values are then calculated of the relative strengths (e.g. ratios or differences) of components of the two signals derived from reflections off the same position. These relative strength values are not greatly affected by variations in the reflection properties of the surface and can be used to determine accurately the frequency components of the signals derived from the boresight.
REFERENCES:
patent: 3072900 (1963-01-01), Beck
patent: 3113308 (1963-12-01), Stavis
patent: 3372389 (1968-03-01), Bellman et al.
patent: 3430236 (1969-02-01), Gamertsfelder
patent: 3701989 (1972-10-01), Calhoon, Sr. et al.
patent: 3772689 (1973-11-01), Root, Jr.
patent: 3896434 (1975-07-01), Sirven
patent: 4005417 (1977-01-01), Collins
patent: 4177463 (1979-12-01), Andermo
patent: 4319245 (1982-03-01), Mawhinney
Brooks Seville R.
Luscombe Anthony P.
The Marconi Company Limited
Tubbesing T. H.
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