Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-05-11
1985-06-18
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5FT, 364726, G01S 1328, G06F 15332
Patent
active
045243638
ABSTRACT:
A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder consists of a plurality of delay stages into which the input pulse is fed, a discrete Fourier transform (DFT) circuit to which the output signals of the delay stages are fed by way of respective phase weights and for which every frequency port is phase-shifted prior to entry to a time-dispersion-means (TDM) comprising an arrangement of delay stages for differently delaying the output signals from the DFT. The TDM output is fed to a phase modulator and then to the transmitter.
The echo signals are conjugated, time-inverted, and passed through the same DFT as the input pulse signal by way of the phase weights. The outputs of the DFT are then phase-shifted at every frequency port and passed through the TDM, but this time in time-inverted order. The outputs of the TDM are fed through an envelope detector to provide a cross-correlated facsimile of the original input pulse.
REFERENCES:
patent: 3176296 (1965-03-01), Adams
patent: 3680104 (1972-07-01), Westaway
patent: 4058715 (1977-11-01), Niwa
patent: 4237461 (1980-12-01), Cantrell et al.
"Radar Handbook", M. I. Skolnik, Ed., pp. 35-15 and 35-16.
Barron Jr. Gilberto
Beers Robert F.
Ellis William T.
Klein Alan P.
The United States of America as represented by the Secretary of
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