Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-11-03
1980-05-06
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 175, G01S 924
Patent
active
042019869
ABSTRACT:
A radar equipment operating with a continuous or virtually continuous wave. The radar equipment is provided with a transmitter/receiver assembly. The transmitter is formed by an oscillator stage whose frequency can be modulated. The oscillator stage is associated with a power amplifier stage. The receiver is of the multi-channel super-heterodyne type enabling an echo of a target to be tracked directionally. The transmitter/receiver assembly is capable of operating in two separate modes, namely a first mode in which the transmitted carrier wave F.sub.o is frequency modulated linearly over a range .DELTA.F, and a second mode in which the carrier wave is pure. The transmitter is provided with a sawtooth pattern signal modulator, the oscillator stage being modulated in operation by the sawtooth signal having a repetition period T.sub.R. The receiver is provided with at least one amplification channel having a final pass band substantially equal to the reciprocal of period T.sub.R, while a generator supplying a local microwave signal coherent in phase with the transmitted signal allows it to be heterodyned by the local microwave signal whose frequency is shifted by an amount equal to the intermediate amplification frequency plus the beat frequency F.sub.b resulting from the transit time of the echo and the Doppler frequency shift.
REFERENCES:
patent: 3065465 (1962-11-01), Wimberly
patent: 3339198 (1967-08-01), Glegg
patent: 3611370 (1971-10-01), Frasure et al.
"Thomson-CSF"
Tubbesing T. H.
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