Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-04-05
1977-10-11
Tubbesing, T.H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5DP, 343 7A, G01S 942
Patent
active
040538850
ABSTRACT:
A moving target indication radar is disclosed in which the zero-Doppler-speed components of the radar return signal are eliminated by correlation processing in the azimuthal direction. In some cases, a similar correlation processing is concurrently performed in the range direction. The moving target indication radar has both a radar signal analog processing portion and a radar signal digital processing portion. The received pulse returns are processed by quadrature phase detectors to provide outputs which are in phase and quadrature phase analog data signals representing real and imaginary parts of the Doppler frequency data. These signals are converted to corresponding digital words which are then divided into a plurality of digital Doppler frequency components by a discrete Fourier transform circuit. A buffer memory is connected to store the outputs of the discrete Fourier transform circuit. An amplitude calculator selectively receives the outputs of the buffer memory and computes the root-mean-square value for each output of the discrete Fourier transform circuit stored in the buffer memory. A second buffer memory is connected to store the outputs of the amplitude calculator, and a correlation processing circuit averages the outputs of the second buffer memory which represent the data of a plurality of every n-th one of the unit azimuthal regions and subtracts the average output from the data for the center of the plurality of unit regions.
REFERENCES:
patent: 3353177 (1967-11-01), Wilmot
patent: 3701149 (1972-10-01), Patton et al.
patent: 3707718 (1972-12-01), Ames
patent: 3950748 (1976-04-01), Busy
patent: 3987442 (1976-10-01), McLeod, Jr.
Irabu Takeru
Kiuchi Eiichi
Tomita Yuichi
Nippon Electric Company Ltd.
Tubbesing T.H.
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