In order to simplify system architectures and make efficient use of laser power, space lasercom system designers often try to consolidate the receiver subsystems. In this paper, the authors present a receiver system which uses a single subsystem for both spatial tracking error sensing and communication signal reception. It makes use of an electro-optic crystal as a conical scanner for tracking error measurement, couples the scanned light into a single mode fiber, and uses standard fiber-based hetereodyne techniques to derive an intermediate frequency signal. This signal is processed to retrieve both the binary FSK signal and the tracking error signal, as well as an etimate of signal power for use in normalizing the tracker error. The fiber-coupled receiver makes possible a modular architecture, whereby the transmitter, receiver, and telescope subsystem can reside in different parts of the spacecraft. Such an architecture is known to have a number of desirable properties. The authors present a discussion of the frequency plan, data demodulation, frequency tracking, spatial tracking, and gain control subsystems. Design considerations and experimental results are presented.
An integrated heterodyne receiver and spatial tracker for binary FSK communication
Ein integrierter Heterodyneempfänger und räumliches Nachführungssystem für die binäre FSK-Kommunikation
1994
12 Seiten, 13 Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
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