Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-11-24
1982-11-16
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 1328
Patent
active
043597360
ABSTRACT:
A doppler-tolerant pulse-compression code generator for generating a plurty of approximately orthogonal codes which will prevent radar interference and suppress jamming. These codes are generated by phase-coding the frequency-band steps and also altering the time-sequence of the frequency steps of a step-approximation to a linear FM chirp pulse. Specifically, this code generator may comprise a circuit for modulating a carrier frequency with a video pulse of bandwidth B having a length less than or equal to a desired compressed pulse length, a tapped delay line having n signal taps for sequentially delaying this video pulse, a comb filter comprising a series of n bandpass filter channels each passing different spectral bands in the bandwidth B, a switching matrix for connecting each of the n signal taps to a different one of the n bandpass filters in a controlled manner, a phase-coding circuit in each bandpass filter channel for phase coding the signal passed through the respective bandpass filter channel, and an adding circuit for adding all of the phase-coded signals from the n bandpass filter channels to form one of a set of orthogonally coded pulses.
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Beers Robert F.
Ellis William T.
The United States of America as represented by the Secretary of
Tubbesing T. H.
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