Receiver performance of laser ranging measurements between the Lunar Observer and a subsatellite for lunar gravity studies

Details Receiver performance of laser ranging measurements between the Lunar Observer and a subsatellite for lunar gravity studies Receiver performance of laser ranging measurements between the Lunar Observer and a subsatellite for lunar gravity studies

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jhu..reptq....d&link_type=abstract

Final Report, 15 Apr. 1991 - 14 Jan. 1992 Johns Hopkins Univ., Baltimore, MD. Dept. of Electrical and Computer Engineering.

Computer Science

Performance

Laser Range Finders, Lunar Gravitation, Lunar Observatories, Photodiodes, Receivers, Satellite Instruments, Semiconductor Lasers, Transmitters, Accuracy, Aluminum Gallium Arsenides, Doppler Effect, Frequency Shift, High Speed, Microchannel Plates, Millimeter Waves, Photomultiplier Tubes, Preamplifiers, Quantum Efficiency, Silicon, Thermal Noise, Velocity Measurement, Vibration

Scientific paper

The optimal receiver for a direct detection laser ranging system for slow Doppler frequency shift measurement is shown to consist of a phase tracking loop which can be implemented approximately as a phase lock loop with a 2nd or 3rd order loop filter. The laser transmitter consists of an AlGaAs laser diode at a wavelength of about 800 nm and is intensity modulated by a sinewave. The receiver performance is shown to be limited mainly by the preamplifier thermal noise when a silicon avalanche photodiode is used. A high speed microchannel plate photomultiplier tube is shown to outperform a silicon APD despite its relatively low quantum efficiency at wavelengths near 800 nm. The maximum range between the Lunar Observer and the subsatellite for lunar gravity studies is shown to be about 620 km when using a state-of-the-art silicon APD and about 1000 km when using a microchannel plate photomultiplier tube in order to achieve a relative velocity measurement accuracy of 1 millimeter per second. Other parameters such as the receiver time base jitter and drift also limit performance and have to be considered in the design of an actual system.

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