ICESAT/GLAS Altimetry Measurements: Received Signal Dynamic Range and Saturation Correction
| Autor: | Gregory A. Neumann, James B. Abshire, John P. DiMarzio, David J. Harding, Adrian A. Borsa, Helen A. Fricker, Fernando S. Paolo, Xiaoli Sun, Donghui Yi, Kelly M. Brunt |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
0211 other engineering and technologies laser ranging Antarctic ice sheet 02 engineering and technology Geological & Geomatics Engineering 01 natural sciences Article remote sensing Altimeter Electrical and Electronic Engineering lidar 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing satellite laser altimetry geography geography.geographical_feature_category ice sheets Detector Elevation Geodesy Geophysics Geomatic Engineering Lidar General Earth and Planetary Sciences Satellite Ice sheet Saturation (chemistry) Geology |
| Zdroj: | IEEE transactions on geoscience and remote sensing : a publication of the IEEE Geoscience and Remote Sensing Society, vol 55, iss 10 Sun, X; Abshire, JB; Borsa, AA; Fricker, HA; Yi, D; Dimarzio, JP; et al.(2017). ICESAT/GLAS Altimetry Measurements: Received Signal Dynamic Range and Saturation Correction. IEEE Transactions on Geoscience and Remote Sensing, 55(10), 5440-5454. doi: 10.1109/TGRS.2017.2702126. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/9n04k1n7 |
| ISSN: | 1558-0644 0196-2892 |
| DOI: | 10.1109/tgrs.2017.2702126 |
| Popis: | © 2017 IEEE. NASA's Ice, Cloud, and land Elevation Satellite (ICESat), which operated between 2003 and 2009, made the first satellite-based global lidar measurement of earth's ice sheet elevations, sea-ice thickness, and vegetation canopy structure. The primary instrument on ICESat was the Geoscience Laser Altimeter System (GLAS), which measured the distance from the spacecraft to the earth's surface via the roundtrip travel time of individual laser pulses. GLAS utilized pulsed lasers and a direct detection receiver consisting of a silicon avalanche photodiode and a waveform digitizer. Early in the mission, the peak power of the received signal from snow and ice surfaces was found to span a wider dynamic range than anticipated, often exceeding the linear dynamic range of the GLAS 1064-nm detector assembly. The resulting saturation of the receiver distorted the recorded signal and resulted in range biases as large as ∼50 cm for ice- and snow-covered surfaces. We developed a correction for this "saturation range bias" based on laboratory tests using a spare flight detector, and refined the correction by comparing GLAS elevation estimates with those derived from Global Positioning System surveys over the calibration site at the salar de Uyuni, Bolivia. Applying the saturation correction largely eliminated the range bias due to receiver saturation for affected ICESat measurements over Uyuni and significantly reduced the discrepancies at orbit crossovers located on flat regions of the Antarctic ice sheet. |
| Databáze: | OpenAIRE |
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