Doppler shift compensation system for laser transmitters and rec

Details Doppler shift compensation system for laser transmitters and rec Doppler shift compensation system for laser transmitters and rec

1989-06-21

1993-02-02

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

367904, H04B 1000

Patent

active

051842416

ABSTRACT:
A laser transmitting and receiving system includes doppler compensation for large doppler shifts in frequency caused by relative motion between a collocated transceiver and a target or relative motion between separated transmitters and receivers. The system includes a tunable laser, a dithered laser optical frequency standard, and a computer for calculating the estimated doppler shift at a given time using platform navigation and attitude control inputs as well as inputs relating to pointing data controlling the direction of transmission. The frequency standard and the computer output are employed to develop a doppler compensation signal which may be used to shift the frequency of the laser transmitter or shift the bandpass of a laser receiver filter. The doppler compensation is provided by a feedback loop which may include r.f. components, a timing trigger from the computer, or wavemeters.

REFERENCES:
patent: 3939341 (1976-02-01), Graves
patent: 3970838 (1976-07-01), Goodwin
patent: 3975628 (1976-08-01), Graves
patent: 4033882 (1977-07-01), Fletcher
patent: 4515472 (1985-05-01), Welch
patent: 4723310 (1988-02-01), DeCorlieu

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