Registers – Transfer mechanism – Traveling pawl
Patent
1974-06-25
1976-02-10
Ruggiero, Joseph F.
Registers
Transfer mechanism
Traveling pawl
250199, G06G 748, H04B 900
Patent
active
039379450
ABSTRACT:
A space-to-space or space-to-earth optical transmission link is simulated by positioning a linear optical modulator between an optical carrier source and a receiver for the carrier. The optical modulator is driven by an analog signal having random variations indicative of characteristics of the transmission link, as derived from an analog computer circuit. The analog computer circuit is responsive to a Gaussian random analog source. For certain types of links, the analog computer circuit is responsive to a pair of Gaussian analog signals which are derived by feeding a relatively wide band Gaussian analog source in parallel to a first low pass filter and to a heterodyne circuit that derives a beat frequency output that is passed through a second low pass filter having the same characteristics as the first low pass filter. For space-to-space transmission, transmitter pointing jitter is a dominant noise source and is simulated by deriving a beta statistical variation from the analog computer. For space-to-earth transmission, atmospheric scintillation is a dominant noise source and is simulated by driving the modulator with one of (1) a log normal, (2) Rayleigh, or (3) Ricean output of the analog computer circuit.
REFERENCES:
patent: 3124678 (1964-03-01), Masonson
patent: 3243592 (1966-03-01), Tomiyasu et al.
patent: 3714437 (1973-01-01), Kinsel
patent: 3752992 (1973-08-01), Fluhr
patent: 3787118 (1974-01-01), Nowicki et al.
Fitzmaurice Michael W.
Tycz Mona
Lawrence Nina M.
Manning John R.
Ruggiero Joseph F.
Sandler Ronald F.
The United States of America as represented by the United States
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