One of the obstacles to wide adapt passive RFID systems is the limited read distance or relatively high error rate due to radio interferences in the passive backscatter RFID systems. The most important tag performance characteristic is read distance at which RFID reader can detect the backscattered signal from the tag. The read distance in passive backscatter RFID systems depends on many factor...

The study of the collective effects of radar scattering from an aggregation of discrete scatterers randomly distributed in a space is important for better understanding the origin of the backscatter from spatially extended geophysical targets (SEGT). We consider the microstructure irregularities of a SEGT as the essential factor that affect radar backscatter. To evaluate their contribution this...

Previous work indicated that ultrasound echo decorrelation imaging can track and quantify changes in echo signals to predict thermal damage during in vitro radiofrequency ablation (RFA). In the in vivo studies reported here, the feasibility of using echo decorrelation imaging as a treatment monitoring tool was assessed. RFA was performed on normal swine liver (N = 5), and ultrasound ablation us...

The Verona Ava Linear Array Radar (VALAR) is a high resolution experimental HF backscatter data acquisition system designed to investigate the characteristics of high latitude auroral clutter. The transmit system located in Ava, New York, is capable of providing RF signals in the 2-30 MHz band with up to 300 kW average power. The receive system at Verona, New York, consists of a 72 element line...

The SeaWinds series of scatterometer instruments were designed to measure vector winds over the ocean at a nominal resolution of 25 km. However, the radar backscatter measurements from which the wind is inferred are made at finer resolution than this. Further, the spatial sampling of the backscatter measurements can support reconstruction of finer scale backscatter values which can then be used...

Rain over the oceans causes attenuation of communication and radar signals for satellites and backscatter to satellite radars. To determine the attenuation and backscatter, one must know the height of the rain in a storm, and must be able to find it from a satellite measurement likely to be available. Microwave radiometers on satellites can provide estimates of rain rates, and therefore relatin...

Since many years Doppler radar profilers are known as valuable tools to retrieve profiles of rain rate and further rain parameters (e.g. Wakasugi et al. (1986)). Applying well established relations for terminal fall velocity, shape and backscatter cross section of rain drops allows to derive rain rate without empirical assumptions. For calculating the backscatter cross section, the flattening o...

In order to improve resolution of ultrasonic imaging, high frequency scanners which are employed in the range 20 MHZ to 50 MHz are needed. As a result, it is critical to obtain data on ultrasonic scattering and attenuation in this frequency range. At these high frequencies, it is not feasible to make scattering measurements with unfocused transducers; therefore focused transducers are needed. U...

a r t i c l e i n f o Keywords: Classification Flood mapping Surface water Radar ASAR Incidence angle Bragg resonance Wind effects Absorption Regression Aral Sea Kazakhstan Uzbekistan Satellite radar data has been employed extensively to monitor flood extents, where cloud cover often prohibits the use of satellite sensors operating at other wavelengths. Where total inundation occurs, a low back...