Castellano, Wilson

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    Low-cost, low infrastructure x-band doppler radar development
    (2011) Castellano, Wilson; Cruz-Pol, Sandra L.; College of Engineering; Colom-Ustariz, José; Rodríguez Solís, Rafael A.; Department of Electrical and Computer Engineering; Walker, Uroyoán R.
    The Student Led Test Bed (STB) is part of the NSF Engineering Research Center CASA and is focused on developing and deploying low cost and low infrastructure weather radars to fill lower atmosphere gaps not covered by current technology. In fact, some of these radars are deployed in western Puerto Rico where precipitation measurements are made to complement measurements taken with the NWS NEXRAD radar. These radars have the option of using solar power and thus can be independent of the power grid, so they are known as Off-The-Grid (OTG) X-band radars. However; they are only capable of providing rain reflectivity measurements. A modification was performed to achieve Doppler capabilities for this radar so they can also measure wind speed. This enhancement was conducted because Doppler capabilities allow the use of superior clutter removal algorithms than those used for reflectivity-only radars, and the radar provides additional information about low level winds in weather events in western Puerto Rico. This project report describes the initial work in the development of the first OTG X-band Doppler radar based on modifications of a marine radar. Two methods to develop a coherent radar are discussed, the Injection Frequency Lock (IFL) method and the Pseudo Coherent method. From these two methods, the Pseudo coherent method was selected after some tests performed at the Microwave Remote Sensing Laboratory (MIRSL) at the University of Massachusetts. As a result a more detailed description of this method is presented in this project report.