Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-02-15
1980-12-02
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 172PC, G01S 1328
Patent
active
042374618
ABSTRACT:
A pulse expansion and compression system, especially useful for radar ranging, 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, a time-dispersionmeans (TDM) comprising an arrangement of delay stages for differently delaying the output signals from the DFT, and a coherent summer for adding the real and imaginary parts of the signals from the TDM. The summer 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. The outputs of the DFT are then passed through a TDM of the same type as the first TDM, but this time in time-inverted order. The outputs of the second TDM are fed through a coherent summer and an envelope detector to provide a cross-correlated facsimile of the original input pulse.
REFERENCES:
patent: 3987285 (1976-10-01), Perry
patent: 4028700 (1977-06-01), Carey et al.
patent: 4156876 (1979-05-01), Debuisser
patent: 4167737 (1979-09-01), Freedman
"An Introduction to Matched Filters", by George L. Turin, IRE Transactions n Information Theory, vol. IT-6, pp. 311-328, Jun., 1960.
"On Digital Filtering", by G-AE Concepts Subcommittee, C. M. Rader, Chairman, IEEE Transactions on Audio and Electroacoustics, Sep., 1968, pp. 303-314.
Cantrell Ben H.
Lewis Bernard L.
Hubler Malcolm F.
Schneider Philip
Sciascia R. S.
The United States of America as represented by the Secretary of
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