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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 10 — Apr. 1, 2012
  • pp: C144–C151

Modified moment-matching method for estimating pointing parameters in the presence of atmospheric turbulence

Zhang Yu, Li Xinyang, and Rao Changhui  »View Author Affiliations


Applied Optics, Vol. 51, Issue 10, pp. C144-C151 (2012)
http://dx.doi.org/10.1364/AO.51.00C144


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Abstract

An accurate pointing system is required in free-space optical (FSO) communication links. Low energy-transmission efficiency caused by pointing errors would decline the communication system’s performance. The statistics of the detected signal or return signal values could be used to estimate the pointing parameters, whereas atmospheric turbulence brings in serious challenges. A modified moment-matching estimation method is presented in this paper. The irradiance fluctuation caused by the atmospheric turbulence is considered, and the probability density function (PDF) in a weak turbulence condition is assumed to be lognormal. This modified approach is evaluated with wave-propagation simulation data and shows significant improvement over the conventional approach. The estimation accuracy and the properties of this new approach are also discussed. Although our method is based on lognormal irradiance PDF under a weak turbulence condition, the irradiance PDF would tend to be lognormal with aperture averaging effect under moderate to strong turbulence, and the ideas can be extended with appropriate PDF models to satisfy different conditions.

© 2012 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(030.6600) Coherence and statistical optics : Statistical optics
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(140.0140) Lasers and laser optics : Lasers and laser optics

History
Original Manuscript: November 28, 2011
Manuscript Accepted: January 16, 2012
Published: March 30, 2012

Citation
Zhang Yu, Li Xinyang, and Rao Changhui, "Modified moment-matching method for estimating pointing parameters in the presence of atmospheric turbulence," Appl. Opt. 51, C144-C151 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-10-C144

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