Doppler frequency compensation circuit

Details Doppler frequency compensation circuit Doppler frequency compensation circuit

1989-11-20

1991-11-05

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Return signal controls radar system

Receiver

455260, 375 1, H04L 2730

Patent

active

050633872

ABSTRACT:
In a communications data link network of the type having a plurality of ground stations and a single moving airborne station, there is provided a doppler frequency compensation circuit in each of the ground stations. The downlink carrier frequency is fixed and continuously broadcast to the receiving ground station which continuously receive the doppler shifted carrier signal. The ground stations are provided with coherent demodulators which provide a coherent I.F. recovered carrier signal that is applied to a scaling phase-locked loop to provide a deviation frequency signal that is applied to an inverting phase-locked loop which provides a pre-compensated uplink R.F. carrier signal. The uplink R.F. carrier signal has a compensated uplink doppler frequency component which equals the inverted and scaled doppler frequency of the received downlink carrier.

REFERENCES:
patent: 3769589 (1973-10-01), Buntschuh et al.
patent: 4630283 (1986-12-01), Schiff
patent: 4724437 (1988-02-01), Jones et al.
patent: 5003552 (1991-03-01), Mower

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