He received a Ph.D. in electrical engineering from the University of Kansas, Lawrence, Kansas, in 1984. He has authored or co-authored over 120 archival journal publications and more than 240 technical reports and conference presentations. His research interests include the application of radars to the remote sensing of the polar ice sheets, sea ice, ocean, atmosphere, and land. He developed several radar systems currently being used at the University of Kansas for sounding and imaging of polar ice sheets, and has also participated in field experiments in the Arctic and Antarctica.
Ultra-wideband Radars for Snow and Soil Moisture Measurements
Ultra-wideband (UWB) microwave radars have great potential for use in research requiring detailed snow and soil moisture measurements. The University of Kansas Center for Remote Sensing of Ice Sheets (CReSIS) developed ultra-wideband radars in the frequency range extending from about 100 MHz to 18 GHz for polar research. One of these radars now operates over the frequency range of 2–18 GHz. This radar has been operated over the frequency ranges of 2–8 GHz and 12–18 GHz in the past to obtain measurements of the thickness of snow over sea ice and map internal layers in polar firn on short- and long-range aircraft. We also collected data over snow on land as targets of opportunity. The results demonstrate definitively that we can map the snow-air and snow-land interfaces with ultra-wideband radars and utilize the data to estimate snow water equivalent (SWE).
We designed the UWB radars to operate in sounder mode for mapping interfaces and collecting multipolarized backscatter data. These backscatter and sounder-mode data can be used to develop algorithms to estimate SWE and soil moisture, which in turn can be utilized in water resources management and flood forecasting. We have previously operated these radars on both short- and long-range aircraft to collect data over snow-covered sea ice, as well as the Greenland and Antarctic ice sheets. In this presentation, we will discuss design considerations for deploying the UWB radars for snow and soil moisture measurements and show sample results over snow, sea ice, and land. We will also discuss how they can be operated on Unmanned Aerial Systems (UASs) for large-scale mapping of snow and soil moisture.