After presenting the multi-channel SAR and the multistatic SAR constellations as the evolutions of present-generation SAR systems, two sets of experiments are proposed to assess their potential applications and validate them, before designing fully operational systems. The experiments from the space are based on the use of the existing SAR together with one or more receiving-only sensors on boa...

Synthetic aperture radar (SAR) is valuable military tool that can generate high-resolution images in any illumination or weather condition. As SAR be used for hostile purposes, it important to develop jamming techniques degrade the quality of images. Jamming performance evaluation (JPE) metrics are evaluate effectiveness systems. Existing JPE using Euclidean distance correlation coefficients, b...

We develop a method for the formation of spotlight-mode synthetic aperture radar (SAR) images with enhanced features. The approach is based on a regularized reconstruction of the scattering field which combines a tomographic model of the SAR observation process with prior information regarding the nature of the features of interest. Compared to conventional SAR techniques, the method we propose...

The potential of differential SAR interferometry for land subsidence monitoring is reported on. The principle of the technique and the approach to be used on a specific case are first presented. Then significant results using SAR data from the ERS satellites for various sites in Germany, Mexico, and Italy, representing fast (mlyear) to slow (mmlyear) deformation velocities, are discussed. The S...

In this paper, we propose a fusion strategy for extracted roads from multi-aspect SAR images. The fusion strategy extends a system for automatic road extraction from SAR images based on line extraction and explicitly modeled knowledge, which has been developed for single SAR images. Due to the side-looking geometry of SAR, the visibility of roads is often limited by adjacent high trees or build...

A 10-bit ultra-low power SAR implemented in a standard 0.18-μm CMOS technology is described. The architecture consists of a coarse and a fine SAR ADC. The 2-bit coarse SAR presets the two MSB capacitive arrays of the fine SAR, thus avoiding the largest sources of dynamic power consumption. The use of two low resolution comparators in the coarse converter enables compensating for the offset mism...

In recent decades, compressive sensing (CS) is a popular theory for studying the inverse problem, and has been widely used in synthetic aperture radar (SAR) image processing. However, the computation complexity of CS-based methods limits its wide applications in SAR imaging. In this paper, we propose a novel sparse SAR imaging method using the Multiple Measurement Vectors model to reduce the co...

INTRODUCTION: Recent methods of designing RF pulses for multi-coil TX systems have focused on solving regularized systems of equations. These techniques linearize the equations relating the RF waveforms to the resulting excitation and then penalize RF candidates with high peak and root-mean-square (RMS) voltages (VP and VRMS, respectively) in an attempt to limit SAR [1,2]. This is sensible beca...

BACKGROUND Thermal effects of radiofrequency electromagnetic fields (REMF) exposure of humans may be assessed by calculations of the parameter recognized as SAR (specific energy absorption rate) in virtual human body models, which actually do not represent anthropometric properties of the entire population. Therefore, it is important to determine the relations between SAR values and anthropomet...

The global regulator sar in Staphylococcus aureus controls the synthesis of a variety of cell wall and extracellular proteins, many of which are putative virulence factors. The sar locus in strain RN6390 contains a 339-bp open reading frame (sarA) and an 860-bp upstream region. Transcriptional analyses of this locus revealed three different transcripts of 0.58, 0.84, and 1.15 kb (designated sar...