Computer Science
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1417..233h&link_type=abstract
In: Free-space laser communication technologies III; Proceedings of the Meeting, Los Angeles, CA, Jan. 21, 22, 1991 (A93-18923 0
Computer Science
Acquisition, Data Links, Optical Communication, Optical Heterodyning, Satellite Communication, Tracking (Position), Position Errors, Signal Detection
Scientific paper
A laboratory model of an optical intersatellite link employing InGaAs DFB semiconductor lasers operating at a wavelength of 1.55 micron was designed and realized. Heterodyne sensing was used for both the spatial acquisition and the spatial tracking processes. The function of a quadrant detector was realized by splitting the superimposed beam at the top of a reflecting pyramid into four subbeams. The angular resolution achieved - without using a telescope - is less than 5 microrad at a detector field of view of 1 mrad. The transmitter laser can be moved within a transverse plane along circular tracks. A microcomputer controls the receiver operation. During the acquisition process spiral scanning of the area of uncertainty is performed. For each search position the local oscillator laser is swept until a beat signal at 700 MHz is detected. Acquisition times of typically less than 16 s for a 200-element uncertainty area and tracking accuracies better than +/- 50 microrad for any examined test condition were achieved.
Hueber Martin F.
Leeb Walter R.
Scholtz Arpad L.
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