Apparatus for synchronized reception in connection with system f

Details Apparatus for synchronized reception in connection with system f Apparatus for synchronized reception in connection with system f

1981-05-29

1982-06-01

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 68LC, 343 65SS, G01S 1376, G01S 1380, G01S 1382

Patent

active

043330789

ABSTRACT:
An apparatus for synchronized signal reception wherein a first signal of frequency f.sub.o is transmitted by a first unit and is reflected by a second unit, which thus transmits the reflected second signal. The reflected signal is modulated by information which is supplied by a coding device 27 in said second unit, which coding device generates a coded pulse train 27p in the form consisting of pulses, i.e. information symbols. A pulse generator 28 is controlled by the pulse train to emit a signal with one of two frequencies k.sub.1 and k.sub.2, respectively, in dependence upon the binary state of the pulse train. The signal is divided in a frequency divider 29 to provide frequencies k.sub.1
and k.sub.2
, respectively, which are supplied to the coding device 27, causing the coding device to emit said pulses with lengths which are related to the cycle lengths of frequencies k.sub.1
and k.sub.2
, respectively. The signal generated in the pulse generator 28 with the frequencies k.sub.1 and k.sub.2, is applied as a modulating signal to the modulator 26, which generates a single sideband with the alternating frequencies f.sub.o +k.sub.1 and f.sub.o +k.sub.2, respectively, constituting said second signal. The receiver 23 of the first unit receives the reflected second signal and scans said information symbols by means of the duration of the signal in dependence of the frequency of the signal.

REFERENCES:
patent: 3018475 (1962-01-01), Kleist et al.
patent: 3022492 (1962-02-01), Kleist et al.
patent: 3521280 (1970-07-01), Janco et al.
patent: 3611379 (1971-10-01), Deckett
patent: 3772688 (1973-11-01), Smit et al.
patent: 3801980 (1974-04-01), Danton et al.
patent: 4196434 (1980-04-01), Fanatsu et al.
patent: 4297700 (1981-10-01), Nard et al.

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