In this work, spectral estimation techniques are used to exploit baseline diversity of a multichannel interferometric synthetic aperture radar (SAR) system and overcome the layover problem. This problem arises when different height contributions collapse in same range-azimuth resolution cell, due presence strong terrain slopes or discontinuities sensed scene. We propose multilook approach counteract multiplicative noise, which is extended nature natural targets; purpose we extend RELAX...

Synthetic aperture radar (SAR) interferometry is a modern efficient technique that allows reconstructing the height profile of observed scene. However, apart for presence critical nonlinear inversion steps, particularly crucial in abrupt topography scenarios, it does not allow one to separate different scattering mechanisms elevation (height) direction within ground pixel. Overlay at elevations same azimuth-range resolution cell can be due either penetration radiation below surface or...

A new interferometric mode crossing the differential synthetic aperture radar (SAR) interferometry and multibaseline SAR tomography concepts, that can be termed tomography, is proposed. Its potentials, coming from joint elevation-velocity resolution capability of multiple scatterers, are discussed. Processing cast in a bidimensional baseline-time spectral analysis framework, with sparse sampling. The use modern data-dependent estimator proposed for processing. Simulated results reported...

A new phase-based technique for localization and tracking of items moving along a conveyor belt equipped with ultrahigh frequency-radio frequency identification (UHF-RFID) tags is described validated here. The based on synthetic-array approach that takes advantage the fact tagged move whose speed path are known priori. In this framework, joint use done radar principles, knowledge-based processing, efficient exploitation reader-tag communication signal. can be easily implemented in any...

Synthetic aperture radar (SAR) data processed with interferometric techniques are widely used today for environmental risk monitoring and security. SAR tomography a recent advance that provide improved three-dimensional (3-D) reconstruction long-term deformation capabilities. This article is meant to discuss the main developments achieved in last few years framework, particular reference both urban forest scenarios. An insight on classical multipass processing also included summarize...

Much interest is continuing to grow in advanced interferometric synthetic aperture radar (SAR) methods for full 3-D imaging, particularly of volumetric forest scatterers. Multibaseline (MB) SAR tomographic elevation beam forming, i.e., spatial spectral estimation, a promising technique this framework. In paper, the important effect temporal decorrelation during repeat-pass MB acquisition tackled, analyzing impact on superresolution (MUSIC) tomography with limited sparse data. Moreover, new...

Synthetic aperture radar interferometry (InSAR) is a powerful technique to derive three-dimensional terrain images. Interest growing in exploiting the advanced multi-baseline mode of InSAR solve layover effects from complex orography, which generate reception unexpected multicomponent signals that degrade imagery both reflectivity and height. This work addresses few problems related implementation into interferometric processing nonlinear algorithms for estimating number signal components,...

Mixed cryoglobulinaemia (MC) and autoimmune chronic hepatitis (AI-CH) are frequently associated with C virus (HCV) infection. Because HCV represents a possible common aetiological factor, the aim of present study is to investigate clinico-serological alterations both MC AI-CH verify overlap between these disorders.Patients from three tertiary referral centres.Two Italian series 88 patients 30 type 1 were studied.MC share several features. The patients' mean age (MC vs. AI-CH: 60 +/- 9 57 13...

The analysis of a distributed multiradar system with decentralized decisions, operating in the presence nonstationary Weibull clutter is presented. Each sensor employs constant false-alarm rate (CFAR) algorithm and binary integration transmits its local decisions to fusion center, which takes final decision. Optimal double thresholds decision rule are determined according Neyman-Pearson (N-P) criterion global performance evaluated by novel approach optimize systems.

In this paper, a new interferometric mode crossing the differential SAR interferometry and multibaseline tomography concepts, can be termed tomography, is proposed. Its potentials, coming from joint elevation-velocity resolution capability, are discussed both in terms of possible novel imaging products, improved operation conventional tomography. Processing cast bidimensional baseline-time spectral analysis framework, with spare sampling. The use modern data-dependent estimator proposed for...

We extend the amplitude and phase estimation (APES) adaptive filter of Stoica et al. (see IEEE Signal Processing Lett., vol.6, p.205-206, Aug. 1999 Trans. Processing, vol.48, p.338-52, Feb2000.) to multiple look scenario. Several important radar sonar applications can benefit from new multilook APES filter. The properties algorithm allow for accurate solution layover problem undistorted reflectivity topographic mapping by means multibaseline interferometry.

In this correspondence we derive explicit expressions for the hybrid Cramer-Rao lower bound (HCRB) on estimation accuracy of signal direction arrival (DOA) from data collected by randomly perturbed arrays. The presence a wavefront spatial decorrelation, which is modeled as multiplicative correlated noise, has also been taken into account in model, since it typical those applications involving extended sources. particular, consider perturbations sensor positions. Existing approaches to DOA...

Three-dimensional (3-D) synthetic aperture radar (SAR) imaging is a recent technique, based on coherent SAR data combination, and aims to obtain full 3-D analysis in space. It multibaseline extension of the interferometry concept offers new options for monitoring ground scenes by means capability separating scattering phenomena along height dimension. In this work, authors summarise extend results obtained processing real ERS satellite urban characterised long time span acquisition...

Decentralised detection systems with parallel decision fusion topology have received significant attention, especially for surveillance radar systems. Typically, a deterministic test (DT) is employed, and the optimal local strategies rule are determined according to Neyman–Pearson (N–P) criterion. The authors show how, in practical applications, communication bottle-neck may significantly limit performance of distributed employing conventional DT. A paradigm introduced decentralised under...

Hepatitis C virus (HCV), a hepatotropic and lymphotropic virus, is the major causative agent of nonA-nonB chronic hepatitis; moreover, it frequently associated with benign malignant lymphoproliferative disorders such as mixed cryoglobulinaemia B-cell non-Hodgkin's lymphoma (NHL). We investigated clinical virological features NHL complicating hepatitis in series 10 patients (M/F 1/9; mean age 63 ± 6SD years). The malignancy appeared after median 8 4SD years from onset was low-grade six...

We introduce a three-antenna SAR interferometer for topographic mapping and statistically optimal technique absolute phase (and hence terrain height) retrieval. This method involves taking advantage of the baseline diversity to obtain non-aliased (i.e. not modulo 2/spl pi/) estimate. The accuracy new is compared basic interferometry. Simulated results show that unambiguous can be determined on pixel basis without sacrificing estimation accuracy, usual values system parameters. In this...

An open problem of along-track interferometry (ATI) for synthetic aperture radar (SAR) sensing ocean surface currents is the need ancillary wind information inversion Doppler centroid measurements, that have to be compensated propagation velocity advancing and/or receding Bragg scatterers. We propose three classes estimators which exploit multibaseline (MB) ATI acquisition and resolution robust data under different degrees a priori about direction value characteristic frequency. Performance...

Two very virulent strains of Marek's disease virus were isolated from two separate farms in northern Italy that had experienced outbreaks vaccinated flocks. The isolates similar to reported the USA terms their enhanced pathogenicity, both for chickens with herpesvirus turkeys, and genetically resistant chickens. This first description outside suggests at least some increasingly frequent Europe may be associated such adoption bivalent or polyvalent vaccines containing, example, attenuated...