92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Monday, 23 January 2012
Improving Cross Polarization for MPAR Via Orthogonal Waveforms
Hall E (New Orleans Convention Center )
Yasser Al-Rashid, LockHeed Martin, MS2, Moorestown, NJ; and R. Nuthalapati, F. X. McGroary, S. Bachmann, and P. Bronecke

Poster PDF (1.0 MB)

The National Weather Service (NWS), Federal Aviation Administration (FAA), and Department of Defense (DoD) maintain several networks of independent ground-based radars (NEXRAD, TDWR, ASR, ARSR) for weather surveillance and air traffic surveillance and control. The NWS is in the process of deploying the dual polarization (dual-pol) upgrade on its NEXRAD network. Nonetheless, even with the upgrades, the newest of radar systems in these networks are based mainly on technology a decade or more old. As the legacy systems age, agencies are considering a consolidated network of Multi Function Phased Array Radar (MPAR). To carry out the weather mission, MPAR would be required to provide the dual-pol comparable to that in the legacy NEXRAD parabolic dishes. The operational parabolic dish with dual-pol capability has extremely good cross polarization isolation (cross-pol). It is understood that any radar to replace the current NEXRAD system must demonstrate similar cross-pol characteristics. Our research and development (R&D) efforts are in addressing potential risks from replacing legacy dish radar with a modern phased array radar. One focus area is in achieving the high dual-pol quality. Theoretical and measured data support the use of orthogonal waveforms to significantly improve cross-pol performance. An S-band phased array panel consisting of 144 dual-pol elements was used for the evaluation. A set of waveforms with different Instantaneous Bandwidth and Pulse width product were used to provide cross correlation and sidelobes performance. The results indicate the orthogonal waveforms further improve cross-pol.

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