Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-06-15
1979-02-13
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 960
Patent
active
041398475
ABSTRACT:
Ground clutter is automatically eliminated from echo signals in a weather pulse radar system to provide signals having an amplitude corresponding to the average intensity of the weather echo over a number of pulses. The reflected waves received in the receiver are linear-detected to provide echo signals. Each one of successive echo signals is compared with another later one which is apart from the each one echo signal by a predetermined time period during which fluctuation of weather target becomes independent, to derive an AC component signal corresponding to the fluctuation. The variance of the amplitude of the derived signal is proportional to the mean power of the weather echo. Thus, the ground clutter and the DC component of the weather echo are eliminated. The AC component signals are unipolarized and, thereafter, averaged. The averaged signals have an amplitude corresponding to the average intensity of the weather echo.
These averaged signals may be logarithmic-converted to provide logarithmic signals similar as in weather radar system employing radar receivers having a logarithmic characteristic.
REFERENCES:
patent: 2736020 (1956-02-01), Atlas
patent: 3160816 (1964-12-01), Cunningham et al.
patent: 3176293 (1965-03-01), Nolen et al.
patent: 3287726 (1966-11-01), Atlas
patent: 3390390 (1968-06-01), Vehrs, Jr.
patent: 3618087 (1971-11-01), Smith et al.
patent: 3634859 (1972-01-01), Wolf
"A New Method of Hail Detection by Dual-Wavelength Radar" by P. J. Eccles et al, reprints of the papers presented at the 14th Radar Meteorology Conference, Tuson, Ariz. (17-20 Nov. 1970), S2768-0158, Department of Geophisical Sciences, The University of Chicago, pp. 1.noteq.6.
Goto Shuichi
Shimzu Toshio
Hubler Malcolm F.
Japan Radio Company, Limited
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