Time and range averaging of lidar echoes using APD-based receivers

Jose M. B. Dias; Elsa S. R. Fonseca; David P. Resendes

doi:10.1117/12.366429

22 October 1999 Time and range averaging of lidar echoes using APD-based receivers

Jose M. B. Dias, Elsa S. R. Fonseca, David P. Resendes

Proceedings Volume 3757, Application of Lidar to Current Atmospheric Topics III; (1999) https://doi.org/10.1117/12.366429
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Jose M. B. Dias, Elsa S. R. Fonseca, and David P. Resendes "Time and range averaging of lidar echoes using APD-based receivers", Proc. SPIE 3757, Application of Lidar to Current Atmospheric Topics III, (22 October 1999); https://doi.org/10.1117/12.366429

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