Calculations of polarized multiple scattered return signals of a space-based multichannel lidar and the retrieval of the extinction coefficient and the particle size distribution based on random sea

Ulrich G. Oppel; Martin Kerscher; Heike Krasting

doi:10.1117/12.228523

15 December 1995 Calculations of polarized multiply scattered return signals of a space-based multichannel lidar, retrieval of the extinction coefficient, and particle size distribution based on random search, including a sensitivity analysis

Ulrich G. Oppel, Martin Kerscher, Heike Krasting

Author Affiliations +

Proceedings Volume 2581, Lidar Techniques for Remote Sensing II; (1995) https://doi.org/10.1117/12.228523
Event: Satellite Remote Sensing II, 1995, Paris, France

Abstract

First, we present some examples of calculations of polarized multiply scattered return signals of a space-based multichannel LIDAR (such as the LITE) and compare them to return signals of a ground-based LIDAR. These methods are variance reduction Monte Carlo algorithms allowing for controlling the empirical variance. Second, we recall the method of random search briefly. Random search procedures are Monte Carlo algorithms which are designed to solve deterministic or stochastic optimization problems and, hence, also deterministic or stochastic equations. Third, we show how variance reduction Monte Carlo methods may be combined with properly chosen random search procedures to retrieve one or more environmental parameters from a given (measured or calculated) LIDAR return signal. Such a procedure is time consuming, of course, but it will allow for the retrieval of several parameters simultaneously and for a sensitivity analysis. Hence, a retrieval procedure based on the combination of variance reduction Monte Carlo methods and random search including such a sensitivity analysis gives much more information than the usual inversion procedures (e.g. based on integral equations and often uncheckable environmental assumptions). Fourth, we present some examples of the (simultaneous) retrieval of the extinction coefficient and the particle size distribution of a cloud from the multiply scattered return signal of a space-based LIDAR and a sensitivity analysis of this retrieval.

Citation Download Citation

Ulrich G. Oppel, Martin Kerscher, and Heike Krasting "Calculations of polarized multiply scattered return signals of a space-based multichannel lidar, retrieval of the extinction coefficient, and particle size distribution based on random search, including a sensitivity analysis", Proc. SPIE 2581, Lidar Techniques for Remote Sensing II, (15 December 1995); https://doi.org/10.1117/12.228523

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