A 10.6-[gamma]m laser-receiver RF subsystem
D. E. Santarpia, T. E. McGunigal, Goddard Space Flight Center, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1971 - Technology & Engineering - 8 pages
One of the problems inherent in the use of optical communication systems is the exceedingly high Doppler shift which can be expected. With the recent development of stable, linear, octavebandwidth, voltage-tunable oscillators, this problem has been solved. A laboratory tracking receiver which is capable of tracking a 1-GHz frequency shift at rates up to 12 MHz/s with subsequent coherent data demodulation was designed and tested. This work demonstrates that the design and fabrication of an RF subsystem, utilizing coherent demodulation of data, for wideband communications systems is now both feasible and practical.
6 pages matching tracking-loop in this book
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1-GHz band 10.6-jum laser communications 20-kHz loop 25-MHz IF signal 25-MHz reference signal 5-MHz signal acquisition loop amplifier approximately Arams broadband capable of tracking carrier tracking loop carrier-loop VCO coherent demodulation components D. E. Santarpia determine developed digital VCO technique exceedingly high Doppler filter frequency modulated Goddard Space Flight Greenbelt GSFC heterodyned high-frequency balanced mixer Kruse Stock Laser Communications Experiment LASER-RECEIVER RF SUBSYSTEM linearity loop bandwidth loop input signal loop phase-detector output loop VCO loss of lock measurements MHz/s modulation index narrowband NASA NASA-Goddard Space Flight noise bandwidth optical communication systems Performing Organization phase detector phase jitter phase-lock receiver preamplifier PREFILTERED IF SPECTRUM radians rate of change reradiation Santarpia and T. E. signal-to-noise ratio solid-state Space Flight Center subcarrier demodulator T. E. McGunigal test signal theoretical maximum permissible threshold sensitivity tracking receiver tracking-loop transfer characteristics tuning range value of SNR Varactor VCO signal voltage voltage-controlled oscillator wideband