Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1984-04-26
1986-03-25
Tarcza, Thomas H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 77, 343 7A, 343 5NQ, G15, G15, G15
Patent
active
045786763
ABSTRACT:
An adaptive filter for enhancing the discrimination of targets from clutter and noise and suitable for use in a pulse doppler radar signal processor which processes successive echo pulse period signalling in accordance with range cell samples is disclosed. One embodiment of the filter has a delayed lattice configuration including a plurality of cascadedly coupled lattice stages, each adapted to operate on the range cell samples of first and second complex signal inputs. The adaptive filter embodiment provides rapid and low cost updating of the lattice stage weighting coefficients so that varying clutter spectrums may be effectively dealt with. Moreover, the lattice filter embodiment is insensitive to average clutter motion and to transmitter phase and gain instabilities. It further permits the use of variable interpulse period operation in radars that are unambiguous in range. Furthermore, the lattice filter embodiment adapts to and whitens the actual clutter spectrum being received by the radar and not some model spectrum that may be quite inaccurate.
REFERENCES:
patent: 4086592 (1978-04-01), Lewis et al.
patent: 4119962 (1978-10-01), Lewis
Hellner Mark
Tarcza Thomas H.
Westinghouse Electric Corp.
Zitelli W. E.
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