Phase modulation apparatus

Details Phase modulation apparatus Phase modulation apparatus

1973-05-23

1977-04-19

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325140, 343 7PF, 343 175, G01S 728, G01S 938

Patent

active

040191850

ABSTRACT:
Phase modulation apparatus particularly suitable for coherent radar applications wherein an interrupted carrier-wave is phase modulated according to a predetermined coded sequence. Apparatus comprises a carrier wave generator having an output for connection to an aerial, a delay line suitably coupled at one end to the output of the generator, and a modulation signal generator for controlling the reflecting actions of a reflector at the other end of the delay line so that signals travelling in the delay line are reflected with a phase-shift dependent on the signal produced by the modulation signal generator. The carrier-wave generator is switched on and off for transmit and receive periods respectively and when switched on its output signal will build up from noise levels injection-phase-locked to a delayed version of the previous transmitted signal, thus preserving phase coherence between successive transmitted signals.

REFERENCES:
patent: 3305863 (1967-02-01), Jacobs
patent: 3308464 (1967-03-01), Lewis
patent: 3341849 (1967-09-01), Cordry et al.
patent: 3371345 (1968-02-01), Lewis
patent: 3390391 (1968-06-01), Kissinger et al.
patent: 3413635 (1968-11-01), Moore
patent: 3663935 (1972-05-01), MacMullen

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