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ICESat Laser Altimeter Pointing, Ranging and Timing Calibration from Integrated Residual Analysis: A Summary of Early Mission ResultsOn January 12, 2003 the Ice, Cloud and land Elevation Satellite (ICESat) was successfully placed into orbit. The ICESat mission carries the Geoscience Laser Altimeter System (GLAS), which consists of three near-infrared lasers that operate at 40 short pulses per second. The instrument has collected precise elevation measurements of the ice sheets, sea ice roughness and thickness, ocean and land surface elevations and surface reflectivity. The accurate geolocation of GLAS's surface returns, the spots from which the laser energy reflects on the Earth's surface, is a critical issue in the scientific application of these data Pointing, ranging, timing and orbit errors must be compensated to accurately geolocate the laser altimeter surface returns. Towards this end, the laser range observations can be fully exploited in an integrated residual analysis to accurately calibrate these geolocation/instrument parameters. Early mission ICESat data have been simultaneously processed as direct altimetry from ocean sweeps along with dynamic crossovers resulting in a preliminary calibration of laser pointing, ranging and timing. The calibration methodology and early mission analysis results are summarized in this paper along with future calibration activities.
Document ID
Document Type
Conference Paper
Scott B Luthcke
(Goddard Space Flight Center Greenbelt, Maryland, United States)
David D Rowlands
(Goddard Space Flight Center Greenbelt, Maryland, United States)
David J Harding
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Jack L Bufton
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Claudia C Carabajal
(NVI Greenbelt, Maryland, United States)
Teresa A Williams
(Raytheon (United States) Waltham, Massachusetts, United States)
Date Acquired
September 7, 2013
Publication Date
October 28, 2003
Publication Information
Publication: Flight Mechanics Symposium 2003
Subject Category
Report/Patent Number
Meeting Information
Flight Mechanics Symposium(Greenbelt, MD)
Distribution Limits
Public Use Permitted.
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