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Laser altimetry simulator. Version 3.0: User's guideA numerical simulator of a pulsed, direct detection laser altimeter has been developed to investigate the performance of space-based laser altimeters operating over surfaces with various height profiles. The simulator calculates the laser's optical intensity waveform as it propagates to and is reflected from the terrain surface and is collected by the receiver telescope. It also calculates the signal and noise waveforms output from the receiver's optical detector and waveform digitizer. Both avalanche photodiode and photomultiplier detectors may be selected. Parameters of the detected signal, including energy, the 50 percent rise-time point, the mean timing point, and the centroid, can be collected into histograms and statistics calculated after a number of laser firings. The laser altimeter can be selected to be fixed over the terrain at any altitude. Alternatively, it can move between laser shots to simulate the terrain profile measured with the laser altimeter.
Document ID
19940021649
Document Type
Technical Memorandum (TM)
Authors
Abshire, James B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mcgarry, Jan F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pacini, Linda K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Blair, J. Bryan (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Elman, Gregory C. (Science Systems and Applications, Inc. Lanham, MD., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Subject Category
GEOPHYSICS
Report/Patent Number
NASA-TM-104588
NAS 1.15:104588
REPT-94B00039
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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