Theoretical and Experimental Analyses of Laser Altimeters for Barometric Measurements Over the Ocean
Tsai, Bin-Ming Benjamin
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https://hdl.handle.net/2142/69285
Description
Title
Theoretical and Experimental Analyses of Laser Altimeters for Barometric Measurements Over the Ocean
Author(s)
Tsai, Bin-Ming Benjamin
Issue Date
1984
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
The optical path length from a satellite to the earth's surface is strongly dependent on the atmospheric pressure along the propagation path. Surface pressure can be determined by measuring the difference between the round-trip propagation times of laser pulses that are transmitted simultaneously at two wavelengths. Although pressure measurements can be made over the ground and water, the application of this technique to pressure measurements over the ocean is considered.
The statistical characteristics and the waveforms of the ocean-reflected laser pulses are studied. The received signal is found to be corrupted by shot noise and time-resolved speckle. The statistics of time-resolved speckle and its effects on the timing accuracy of the receiver are studied in the general context of laser altimetry.
For estimating the differential propagation time, various receiver timing algorithms are proposed and their performances evaluated. The results indicate that, with the parameters of a realistic altimeter, a pressure measurement accuracy of a few millibars is feasible.
The data obtained from the first airborne two-color laser altimeter experiment are processed and analyzed. The results are used to verify the pressure measurement concept.
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