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Proceedings Paper

Laser Doppler Measurement Techniques For Spacecraft
Author(s): Peter W. Kinman; Robert M. Gagliardi
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Paper Abstract

Two techniques are proposed for using laser links to measure the relative radial velocity of two spacecraft. The first technique determines the relative radial velocity from a measurement of the two-way doppler shift on a transponded radio-frequency subcarrier. The subcarrier intensity-modulates reciprocating laser beams. The second technique determines the relative radial velocity from a measurement of the two-way doppler shift on an optical frequency carrier which is transponded between spacecraft using optical Costas loops. The first technique might be used in conjunction with noncoherent optical communications, while the second technique is compatible with coherent optical communications. The first technique simultaneously exploits the diffraction advantage of laser beams and the maturity of radio-frequency phase-locked loop technology. The second technique exploits both the diffraction advantage of laser beams and the large doppler effect at optical frequencies. The second technique has the potential for greater accuracy; unfortunately, it is more difficult to implement since it involves optical Costas loops.

Paper Details

Date Published: 15 May 1986
PDF: 7 pages
Proc. SPIE 0616, Optical Technologies for Communication Satellite Applications, (15 May 1986); doi: 10.1117/12.961051
Show Author Affiliations
Peter W. Kinman, Jet Propulsion Laboratory (United States)
Robert M. Gagliardi, University of Southern California (United States)


Published in SPIE Proceedings Vol. 0616:
Optical Technologies for Communication Satellite Applications
Kul B. Bhasin, Editor(s)

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