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The following topics are dealt with: airborne radar; MTI & ECCM; waveform design and synthesis; advanced interferometric SAR technique; active phased array; data fusion & KBS; spaceborne SAR and meteorology.
Weather radar polarimetric techniques have been widely studied due to their potential to improve radar rainfall estimation and to infer on the microphysical characteristics of clouds and precipitation. Nowadays, polarimetric techniques are receiving an increasing attention from meteorological services. In fact, programs aiming at upgrading national weather radar networks with polarimetry are ongoing...
The cloud profiling Radar (CPR), the primary science instrument of the CloudSat mission, is a 94-GHz nadir-looking radar that measures the power backscattered by clouds as a function of distance from the radar. This instrument has been acquiring global time series of vertical cloud structure at 500-m vertical resolution and 1.4-km horizontal resolution since June 2, 2006. In this paper an overview...
Dual-polarized weather radars are capable to detect and identify different classes of hydrometeors, within stratiform and convective storms exploiting polarimetric diversity. A model-supervised Bayesian method for hydrometeor classification (BRAHC), tuned for S- and X- band, is described in this study. The critical issue of X-band radar data processing is the path attenuation correction, usually negligible...
Bird quantification through the analysis of radar echoes must deal with several problematic issues. Among other aspects, the complex characteristics of the received signal due to the radar cross section of a bird in flight, limit methods based on a straight conversion of radar reflectivity into bird density. In this paper we propose a bird count algorithm envisaged for processing radar maps collected...
Current weather radar surveillance networks are based upon conventional sensing paradigm of widely-separated, standalone sensing systems using long range radars that operate at wavelengths in 5-10 cm range. Such configuration has limited capability to observe close to the surface of the earth because of the earthpsilas curvature but also has poorer resolution at far ranges. The center for Collaborative...
A new high resolution Ku-band Doppler radar with scanning capability for meteorological applications has been developed. With the new system design, the radar can accurately measure the radar reflectivity factor with 4-m resolution at the lowest usable height of 60 m from short distance (e.g., minimum detectable reflectivity at 60 m is 5 dBz) to a few km (e.g., min. det. refl. at 2 km is 30 dBz) for...
Tuscany regional government has improved the real time weather monitoring system by setting up a regional weather radar network, to provide an useful hydro-geological risk reduction instrument to the civil protection emergency system. The fully automated regional radar network is constituted by three ARIES-C systems which are fully coherent Doppler weather radars, operating in C-band with very reduced...
This paper presents a novel solution to the problems of clutter in the application of indoor radio-acoustic-sounding systems (RASS). A low-cost monostatic configuration comprising a horn-lens surrounded by an annular array of 40kHz acoustic transducers is constructed. A combination of the high acoustic frequency, and hence, high attenuation, and the narrow beam reduce the possibility of interference...
This paper introduces a new model approach that derives three-dimensional refractivity profiles from mesoscale numerical weather prediction (MSNWP), applies them to parabolic equation propagation models, and combines them with empirical surface clutter reflectivity to generate a more realistic model of surface clutter. Realistic site specific clutter models must be faithful to the energy propagation...
IRCTR has built a new high resolution meteorological radar, IDRA, to observe the spatial and temporal distribution of rainfall and drizzle in an area surrounding the CESAR observatory in Cabauw (The Netherlands). The present paper discusses the system performance and signal processing implemented and provides an example of dataset obtained by the system.
Bird strike hazards take place frequently in the world without prediction, destroying the expensive aircrafts, killing the pilots and the passengers, and bringing people disaster and sorrow. The conventional visual techniques donpsilat work at night or on the foggy and rainy days; even the weather radars couldnpsilat identify the birds accurately for its low resolution. In this paper, a novel method...
In this work the concept of depolarization response, namely the degree of polarization as a function of transmit polarization state, is investigated. Application examples are shown in the field of radar meteorology, namely for hydrometeor identification with fully polarimetric weather radar signatures. Data are from POLDIRAD, DLR research weather radar.
Rapid improvements in skill and spatio-temporal resolution of mesoscale numerical weather prediction models have recently created the ability to simulate notional radar design performance in four dimensional non-standard refractivity environments. This paper quantifies the engineering demands, relative to a standard atmosphere, placed on notional ship borne S band, C band and X band radars during...
This paper discusses three diverse topics in radar that have little relationship to one another, other than they represent what might be interesting for further exploration. These topics are: (1) a suggested origin for microwave sea echo (something not currently understood), (2) a different type of phased array radar architecture based on digital beamforming that can overcome a serious weakness of...
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