Beam Multiplexing Using the Phased-Array Weather Radar

Yu, Tian-You; Orescanin, Marko; Curtis, Christopher D.; Zrnić, Dúsan S.; Forsyth, Douglas E.

doi:10.1175/jtech2052.1

Cited by 59 publications

(33 citation statements)

References 15 publications

(18 reference statements)

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“…Finally, the third method of Richardson number estimation will make use of previous studies' laboratory findings which relate KHI characteristics to Richardson number [37]. In recent years, phased-array weather radar systems have become increasingly commonplace, as attention has been drawn to advantages gained by use of beam multiplexing and agile beam steering [43][44][45][46][47]. This study makes use of the AIR, an X-band phased-array imaging radar designed and built by faculty, staff, and students at the University of Oklahoma Advanced Radar Research Center (OU ARRC) [48].…”

Section: Data Collection and Methodsmentioning

confidence: 99%

Observations of a Cold Front at High Spatiotemporal Resolution Using an X-Band Phased Array Imaging Radar

Mahre

Palmer

et al. 2017

Atmosphere

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While the vertical structure of cold fronts has been studied using various methods, previous research has shown that traditional methods of observing meteorological phenomena (such as pencil-beam radars in PPI/volumetric mode) are not well-suited for resolving small-scale cold front phenomena, due to relatively low spatiotemporal resolution. Additionally, non-simultaneous elevation sampling within a vertical cross-section can lead to errors in analysis, as differential vertical advection cannot be distinguished from temporal evolution. In this study, a cold front from 19 September 2015 is analyzed using the Atmospheric Imaging Radar (AIR). The AIR transmits a 20-degree fan beam in elevation, and digital beamforming is used on receive to generate simultaneous receive beams. This mobile, X-band, phased-array radar offers temporal sampling on the order of 1 s (while in RHI mode), range sampling of 30 m (37.5 m native resolution), and continuous, arbitrarily oversampled data in the vertical dimension. Here, 0.5-degree sampling is used in elevation (1-degree native resolution). This study is the first in which a cold front has been studied via imaging radar. The ability of the AIR to obtain simultaneous RHIs at high temporal sampling rates without mechanical steering allows for analysis of features such as Kelvin-Helmholtz instabilities and feeder flow.

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Section: Data Collection and Methodsmentioning

confidence: 99%

Observations of a Cold Front at High Spatiotemporal Resolution Using an X-Band Phased Array Imaging Radar

Mahre

Palmer

et al. 2017

Atmosphere

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“…Recent NWRT measurements showed the phased array radar's ability to reduce scan time at least by a factor of 2 by rapidly steering the beam to a set of spatially diverse pointing angles using beam multiplexing (Yu et al, 2007). Beam multiplexing reduces errors in radar measurements while providing rapid updates of scan volumes.…”

Section: Engineering Rationale For Next Generation Airborne Radarmentioning

confidence: 99%

The next generation airborne polarimetric Doppler weather radar

Vivekanandan

Lee

Loew

et al. 2014

Geosci. Instrum. Method. Data Syst.

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Abstract.Results from airborne field deployments emphasized the need to obtain concurrently high temporal and spatial resolution measurements of 3-D winds and microphysics. A phased array radar on an airborne platform using dual-polarization antenna has the potential for retrieving high-resolution, collocated 3-D winds and microphysical measurements. Recently, ground-based phased array radar (PAR) has demonstrated the high time-resolution estimation of accurate Doppler velocity and reflectivity of precipitation and clouds when compared to mechanically scanning radar. PAR uses the electronic scanning (e-scan) to rapidly collect radar measurements. Since an airborne radar has a limited amount of time to collect measurements over a specified sample volume, the e-scan will significantly enhance temporal and spatial resolution of airborne radar observations. At present, airborne weather radars use mechanical scans, and they are not designed for collecting dual-polarization measurements to remotely estimate microphysics. This paper presents a possible configuration of a novel airborne phased array radar (APAR) to be installed on an aircraft for retrieving improved dynamical and microphysical scientific products. The proposed APAR would replace the aging, Xband Electra Doppler radar (ELDORA). The ELDORA Xband radar's penetration into precipitation is limited by attenuation. Since attenuation at C-band is lower than at Xband, the design specification of a C-band airborne phased array radar (APAR) and its measurement accuracies are presented. Preliminary design specifications suggest the proposed APAR will meet or exceed ELDORA's current sensitivity, spatial resolution and Doppler measurement accuracies of ELDORA and it will also acquire dual-polarization measurements.

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“…Likewise, combined with the locity are estimated using the autocovariance method (commonly called the pulse-pair processor) [17] . And the precision equation for measurement can be given by Tab.3 shows that the experimental results coincide with the previous simulation results of A340 wake vortex.…”

Section: Fig6 Variation Graph Of Accuracy Of Wake Vortex Detection Wmentioning

confidence: 99%

Design of airport wake vortex monitoring system based on 1.5-μm pulsed coherent Doppler lidar

et al. 2011

Optoelectron. Lett.

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Tianjin University of Technology and Springer-Verlag Berlin Heidelberg 2011 C To shun the vortex hazard, the airport wake vortex monitoring system based on 1.5-m pulsed coherent Doppler lidar is designed successfully in this paper. Based on the realistic analytical model, the wake vortex generated by airbus A340 under typical flight condition is simulated. Then the principle of airport wake vortex monitoring is introduced, and the work flow of the monitoring system is also presented. Moreover, based on the mechanism of vortex coherent detection and typical system parameters, both detection SNR and detection precision are obtained through numerical simulations. When the system outputs 2 J energy, the coherent detection SNR at 10 km distance is up to 23.452, and detection precision can reach 0.328 m/s. With the wake vortex monitoring experiment of A340, some vortex parameters are estimated. Due to these results comparatively coinciding with the previous simulation conclusions, the ability of Doppler lidar for full-scale wake vortex characterization and real time measurement is demonstrated. The study shows that the wake vortex detection based on 1.5-m pulsed coherent Doppler lidar has the advantages of high accuracy and far distance, and the designed airport wake vortex monitoring system has proved to be effective and feasible, which has significant development and application prospect in the aspect of assuring flight security and increasing airport capacity.

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Beam Multiplexing Using the Phased-Array Weather Radar

Cited by 59 publications

References 15 publications

Observations of a Cold Front at High Spatiotemporal Resolution Using an X-Band Phased Array Imaging Radar

Observations of a Cold Front at High Spatiotemporal Resolution Using an X-Band Phased Array Imaging Radar

The next generation airborne polarimetric Doppler weather radar

Design of airport wake vortex monitoring system based on 1.5-μm pulsed coherent Doppler lidar

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