Stephen J. Katzberg

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—Instrumentation and retrieval algorithms are described which use the forward scattered range-coded signals from the global positioning system (GPS) radio navigation system for the measurement of sea surface roughness. This roughness has long been known to be dependent upon the surface wind speed. Experiments were conducted from aircraft along the TOPEX(More)
[1] Since 1996 when GPS reflected signals were purposefully acquired, an effort to assess the utility of these signals has been under way. It was early determined that the reflected GPS signal can be related to ocean surface wind dependent slope probability densities. Quantifying that relationship has resulted in considerable data taken at wind speeds below(More)
The L-band broadcast signal from the Global Position-used by conventional scatterometers. Published by Else-vier Science Inc. ing System (GPS) reflected off of the sea surface is under study for use as a ocean, coastal, and wetlands remote sensing tool. The reflected signal from a given GPS satellite is cross-correlated with the pseudorandom noise code(More)
The NASA EV-2 Cyclone Global Navigation Satellite System (CYGNSS) is a spaceborne mission focused on tropical cyclone (TC) inner core process studies. CYGNSS attempts to resolve the principle deficiencies with current TC intensity forecasts, which lies in inadequate observations and modeling of the inner core. The inadequacy in observations results from two(More)
The results of GPS L-band (L1, = 19 cm) surface reflection measurements observed using multiple polarizations and receiving antenna gains are described. The measurements were performed using the 300-m tall ETL Boulder Atmospheric Observatory (BAO) tower during summer through fall of 2002. In this experiment the first seasonal measurements of bare soil(More)
He has worked in the field of GPS applications since 1994 and has been involved with ocean-reflected GPS technology on a NASA GSRP fellowship since 1998. Valery Zavorotny is a research scientist at the Environmental Technology Laboratory of the National Oceanic and Atmospheric Administration in Boulder. With a Ph.D., awarded by the (former) USSR Academy of(More)
The Cyclone Global Navigation Satellite System (CYGNSS) is a spaceborne mission concept focused on tropical cyclone (TC) inner core process studies. CYGNSS attempts to resolve the principle deficiencies with current TC intensity forecasts, which lies in inadequate observations and modeling of the inner core. CYGNSS consists of 8 GPS bistatic radar receivers(More)
Botswana has suffered extensively from flooding resulting from sudden downpours, the most serious of which was the February 2000 event which resulted from remnants of tropical cyclones. Extensive road flooding occurred, north-south links were severed and many hundreds of lives were lost. Such flooding has occurred before, but without such intensity. Efforts(More)