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Zhaoyan Liu, Mark Vaughan, David Winker, Chieko Kittaka, Brian Getzewich, Ralph Kuehn, Ali Omar, Kathleen Powell, Charles Trepte, and Chris Hostetler

to complement current measurements and improve our understanding of weather and climate. The availability of a global, multiyear set of vertically resolved measurements of the earth’s atmosphere should ultimately lead to great improvements in both weather and climate models. CALIOP is the first satellite-borne lidar optimized specifically for aerosol and cloud measurements, and is also the first polarization lidar in space. CALIOP is a dual-wavelength, polarization-sensitive elastic backscatter

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

extract any science data information needed for instrument performance evaluation and insert it into the H&S data, as will be discussed below. e. Onboard processing Onboard computations of position, altitude, and sun elevation allow automatic reconfiguration and timing control. When combined with onboard processing of science data, a large reduction in the downlink data rate is achieved, allowing a full day’s science data to be downlinked in a single X-band contact. Onboard processing also includes

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David M. Winker, Mark A. Vaughan, Ali Omar, Yongxiang Hu, Kathleen A. Powell, Zhaoyan Liu, William H. Hunt, and Stuart A. Young

and horizontally on board the satellite before downlinking (according to the scheme shown in Table 2 ) to reduce the telemetry bandwidth required. Further details on the instrument and data acquisition are given in Hunt et al. (2009) , and initial evaluations of on-orbit performance can be found in Winker et al. (2007) and McGill et al. (2007) . CALIPSO flies in a near-nadir attitude so that the CALIOP footprints nominally fall on the satellite groundtrack. Prior to November 2007, the

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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

contributions, bias errors will exert relatively more influence at coarser spatial resolutions. 4. Performance examples During the development phase, SIBYL was rigorously and repeatedly tested using synthetic data generated by high-fidelity simulation software that models all components of the CALIOP transmitter and receiver and generates both the signal and the noise characteristic of analog detection of backscattered laser light ( Powell 2005 ). Detailed results for many of these tests are given in the

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