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Mark A. Vaughan, Kathleen A. Powell, David M. Winker, Chris A. Hostetler, Ralph E. Kuehn, William H. Hunt, Brian J. Getzewich, Stuart A. Young, Zhaoyan Liu, and Matthew J. McGill

detection of the complete vertical extent of the initial feature and of any secondary features that may also be present requires updated assessments of the signal attenuation resulting from overlying layers. Figure 3 illustrates the detection problem. In the presence of noise, a threshold detection scheme is susceptible to two kinds of errors: the measured backscatter intensity of legitimate features may fall below the detection threshold, which results in missed features (false negatives), or the

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William H. Hunt, David M. Winker, Mark A. Vaughan, Kathleen A. Powell, Patricia L. Lucker, and Carl Weimer

problems experienced by the LITE laser, and Afzal (2006) and Afzal et al. (2007) describe the GLAS laser experience. Several factors have contributed to the superior performance of the CALIOP laser ( Hovis 2006 ). Among them are very stringent contamination control, operation at derated energy levels, and careful attention to lessons learned from previous lasers, including a risk-reduction laser similar to the flight design that was operated for more than two billion shots prior to the CALIPSO

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