Swept-carrier transmission system adapted for use in process con

Details Swept-carrier transmission system adapted for use in process con Swept-carrier transmission system adapted for use in process con

1978-06-19

1980-06-24

Bookbinder, Marc E.

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 71, 455265, H04B 106

Patent

active

042097509

ABSTRACT:
A data transmission system comprising a transmitter producing a high-frequency carrier modulated with data and swept in a repetitive time pattern over a wide frequency range. The modulation of the carrier is so controlled that a characteristic of the data signal modulation has a predetermined relationship with respect to the repetitive sweep time pattern. The system receiver comprises a narrow-band IF channel coupled to the output of a mixer arranged to receive the incoming swept-carrier signal and a correspondingly-swept local oscillator signal. The sweep control signal for the local oscillator is developed by a circuit coupled to the mixer output and responsive to the data modulation on the IF signal. In one disclosed embodiment, the transmitter carrier is frequency-swept with a sinusoidal time pattern, the data signals have a biphase format with a frequency one-half that of the carrier sweep frequency, and the sweep control signal for the local oscillator is developed by directing the biphase data signals to a 2X frequency multiplier the output of which is filtered to produce a sinewave control signal for the local oscillator.

REFERENCES:
patent: 2206695 (1940-07-01), Guanella
patent: 2448055 (1948-08-01), Silver et al.
patent: 3470477 (1969-09-01), Battail et al.
patent: 3617892 (1967-02-01), Hawley et al.
patent: 3624507 (1967-04-01), Fukata et al.

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