4a.3 Studies of Phased-array Scan Strategies for Radar Data Assimilation
نویسندگان
چکیده
1. INTRODUCTION * Sponsored by multi-government agencies and especially by the US Navy, a phased-array weather radar has been constructed at NSSL Norman Oklahoma. This establishes the first National Weather Radar Testbed (NWRT) equipped with the solid-state phased-array antenna (Forsyth et al. 2005). One of the important and yet very challenging research goals at NWRT is to optimally design and utilize the electronically-controlled agile beam scans for various meteorological applications. This includes assimilating phased-array radar observations into mesoscale models to improve numerical analyses and predictions of severe storms and other hazardous weather conditions. To this end, this paper intends to address the following two basic issues: (i) how to measure information content extracted from radar observations by an optimal 4D analysis; and (ii) how to balance radar observation accuracy with observation spatial and temporal resolutions to optimally design phased-array scans for a 4D assimilation system. These issues are important for measuring and taking the full advantages of phased-array rapid and flexible scan capabilities in data assimilation. The first issue is addressed theoretically in the next section. The second issue is examined numerically in section 3.
منابع مشابه
10: Meteorological Studies With the Phased Array Weather Radar and Data Assimilation Using the Ensemble Kalman Filter
متن کامل
P7.1 Study on the Optimal Scanning Strategies of Phase-array Radar through Ensemble Kalman Filter Assimilation of Simulated Data
1 The phased-array radar (PAR) of the National Weather Radar Testbed (NWRT) in Norman, Oklahoma represents a paradigm shift for weather radar observations. The PAR with abilities such as a higher data update rate through beam multiplexing (Yu et al. 2007) offers not only an opportunity but also a challenge for meteorologists to exploit its potentials for helping us improve convective storm anal...
متن کامل7.4: A Polar-Coordinate Real-Time Three-Dimensional Rapidly Updating Merger Technique for Phased Array Radar Scanning Strategies
The National Weather Radar Testbed (NWRT) phased array radar will not be operated in fixed volume coverage patterns. Instead, the phased array radar will attempt to simultaneously maximize the utility of several possible uses, such as 3D storm analysis, area surveillance and aircraft tracking. In order to do so, the phased array radar will employ adaptive scanning and intersperse meteorological...
متن کاملP2.17 Impact of Spatial Over-sampling by Phase-Array Radar on Convective-Storm Analysis using Ensemble Kalman Filter and Simulated Data
1The phased-array radar (PAR) of the National Weather Radar Testbed (NWRT) in Norman, Oklahoma represents a paradigm shift for weather radar observations. Through beam multiplexing (Yu et al. 2007), increased measurement accuracy can be achieved without increasing volume scan time. Alternatively, at the same measurement accuracy, more independent samples can be collected within a given time, al...
متن کاملMeteorological Studies with the Phased Array Weather Radar and Data Assimilation Using the Ensemble Kalman Filter
This project leverages on the new PAR in Norman, Oklahoma to exploit phased array technology and its applications to improve NWP through EnKF data assimilation with the goal of improving environmental characterization and forecast to optimize naval operation. This project will further enhance the existing collaboration among ONR, National Serve Storms Laboratory (NSSL), and the University of Ok...
متن کامل