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Proceedings Paper

Measured Turbulence And Speckle Effects In Laser Radar Target Returns
Author(s): David M. Papurt; Jeffrey H. Shapiro; Sun T. Lau
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Paper Abstract

Previous studies have established a mathematical system model for a compact coherent laser radar which incorporates the statistical effects of target speckle and glint, local oscillator shot noise, and propagation through atmospheric turbulence. This paper reports results from a measurement program at the MIT Lincoln Laboratory aimed at verifying the foregoing model. Simultaneous laser radar returns and scintillation sensor measurements were collected over a one kilometer path in various turbulence conditions, with the radar observing either a glint object (retro-reflector) or a speckle object (flame-sprayed aluminum calibration plate). Three modes of laser radar operation were employed: full field-of-view scanning, reduced field-of-view scanning, and staring. The principal conclusions drawn from analyzing these data are as follows. First, beam jitter must be included in the system model. Second, the jitter-corrected retro-reflector returns do show turbulence induced lognormal scintillation. Third, turbulence-induced beam jitter is the cause for staring-mode speckle target decorrelation.

Paper Details

Date Published: 13 December 1983
PDF: 13 pages
Proc. SPIE 0415, Coherent Infrared Radar Systems and Applications II, (13 December 1983); doi: 10.1117/12.935910
Show Author Affiliations
David M. Papurt, Northeastern University (United States)
Jeffrey H. Shapiro, Massachusetts Institute of Technology (United States)
Sun T. Lau, Digital Equipment Corporation (United States)

Published in SPIE Proceedings Vol. 0415:
Coherent Infrared Radar Systems and Applications II
Robert C. Harney, Editor(s)

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