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The design, modeling and measurement results of a mid-size cylindrical polarimetric phased array radar (CPPAR) antenna for weather sensing applications is presented. The beam scanning in the elevation is obtained using the frequency scanning concept while the azimuth scanning is achieved using both the commutation and the beam scanning. The maximum elevation scan angle is about 20 degrees and the frequency range is from 2.7 to 3.0 GHz. The cylindrical array consists of 96 frequency scanning vertical columns mounted on the surface of cylinder with the diameter and height of 2 meters. Each antenna column consists of 19 stacked microstrip patch elements fed by two series feed striplines terminated to matched loads. The patch elements are excited through the aperture on the ground plane. The antenna column is modeled using a full wave solution and then it is fabricated and tested in an anechoic chamber. In addition, the simulation results of the full cylinder consisting of 96 antenna columns are presented.

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Establishment of an effective software architecture for the Open System Radar Product Generation (ORPG) subsystem will result in a Next Generation Weather Radar (NEXRAD) system where the software will be portable, scaleable, extensible, and interoperable. Several characteristics of the targeted architecture will contribute to these qualities. The establishment of well encapsulated software layers will promote portability, extensibility, and the ability to effectively upgrade software within the ORPG. The use of software standards will aid in portability and interoperability between like-standard compliant software, be it commercially or custom developed. The resulting ORPG will be composed of a collection of independent functions operating in an interdependent fashion, providing a more robust and scaleable FWG.The ultimate goal of the ORPG software architecture is to encourage and facilitate the insertion of the latest meteorological technology and better support the evolution of the NEXRAD system to effectively satisfy the operational requirements of the field.

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