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Proceedings Paper

Time and range averaging of lidar echoes using APD-based receivers
Author(s): Jose M. B. Dias; Elsa S. R. Fonseca; David P. Resendes
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Paper Abstract

Lidar receivers perform time and/or space averaging to decrease the variance of the optical power estimates. In this paper we study an Avalanche PhotoDiode based receiver. The number samples to reach a given minimum variance depends on the receiver transfer function. Herein, we review the linear receiver and derive the number of samples for the logarithmic pre-amplifier. Comparing the two receivers, we show that the signal variance for the logarithmic case is degraded by a factor that vanishes as the receiver aperture increases. These results can be readily applied to the problem of estimating log-power returns in the context of Differential Absorption lidar systems. As an application example, we study two different log-power estimators and compare their performance.

Paper Details

Date Published: 22 October 1999
PDF: 9 pages
Proc. SPIE 3757, Application of Lidar to Current Atmospheric Topics III, (22 October 1999); doi: 10.1117/12.366429
Show Author Affiliations
Jose M. B. Dias, Instituto Superior Tecnico (Portugal)
Elsa S. R. Fonseca, Instituto Superior Tecnico (Portugal)
David P. Resendes, Instituto Superior Tecnico (Portugal)


Published in SPIE Proceedings Vol. 3757:
Application of Lidar to Current Atmospheric Topics III
Arthur J. Sedlacek; Kenneth W. Fischer, Editor(s)

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