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This paper describes the results of a research project which is aimed at designing and realizing innovative multifunctional radar architecture based on Tile elements. In this paper we focus on the description of the design strategy of the antenna front end and on the digital beamforming architecture able to meet the performance requirements. In particular a suitable digital beamforming technique exploiting...
Despite of the large amount of supporting literature and the significant benefits, up-to-date non-redundant sampling strategies for antenna testing by near-field measurements are not used in an industrial context. The experimental validation of active electronic scanned antennas (AESA) is still performed by using traditional regular sampling strategies. In this paper, the factors that have limited...
Old and poorly constructed pipelines, inadequate corrosion protection, poorly maintained valves and mechanical damage are factors contributing to leakage. One effect of water leakage, besides the loss of water resources, is reduced pressure in the supply system. Raising pressures to make up for such losses increases energy consumption. This rise in pressure makes leaking worse and has adverse environmental...
A new method based on an improved version of the well-known multiple signal classification (MUSIC) algorithm for life signs detection is proposed. With respect to other competitive methods already available in the literature, the proposed method assures higher dynamic range of the estimated spectrum and effective noise/clutter rejection when detecting the respiratory and the cardiac activities from...
Through wall imaging systems are desirable for police, first responders and military applications. Starting from successes in geological and medical applications, many researchers are applying radio frequency and other sensing modes to penetrate wall materials and make intelligent decisions about the contents of rooms and buildings. Aim of this paper is to show the feasibility of innovative systems...
The development of intelligent surveillance systems is an active research area of increasing interest. In recent years, autonomous or semi-autonomous mobile robots have been adopted as useful means to reduce fixed installations and number of devices needed for surveillance of a given area. In this context SELEX Sistemi Integrati is investigating the possibility to use robots-sensors systems to improve...
A feedback control network based on photonic sensors has been exploited to increase resiliency of large phased arrays for radar and space applications has been proposed. The sensor network is embedded in the antenna array front-end such to provide a a real-time control of the failures/calibration errors of system components. The feedback system dynamically acts on the weights of the Beam Forming Network...
The paper deals with the problem of non intrusive detection of concealed people by means of passive acoustic sensors To this aim, the authors present hereinafter a new method capable of detecting and recognizing vital signs, typical of human beings, thanks to the use of a suitable data acquisition system, based on a geophones network, and a proper digital signal processing algorithm. In particular,...
The paper deals with the implementation of a suitable technological support to improve the success likelihood of Urban Search and Rescue (USAR) missions. In particular, the adoption of an heterogeneous sensors network for situation awareness and security applications is suggested. The sensor network consists of two types of sensor, mandated, respectively, to through-the-wall radar (TTW) imaging and...
The development of intelligent surveillance systems is an active research area. In this context, mobile and multifunctional robots have been recently adopted as successful means to reduce fixed installations and the number of devices needed to cover a given area. On the other hand, modern techniques for data fusion and decision making can significantly increase the information content extracted from...
This communication deals with the solution of microwave imaging problems exploiting a Compressive Sampling (CS) based method, an emerging technique for data acquisition and signal recovery based on its property of requiring lower dimensional data. In particular, the inversion procedure was tested on the Contrast Source-Extended Born model. We also considered the classic Born inversion in order to...
A through-wall imaging problem for a 2-D geometry is considered. A new method for through the wall detection and tracking of hidden targets (e.g. human bodies in rescue missions) in two-dimensional scenes, by using radio frequency signals, is presented. In particular, a new approach is proposed and discussed, mainly based on a multisensor system and an advanced imaging technique, which properly exploits...
The objective of this work is to realize a photoconductive switch able to generate short pulses with very high amplitude, in order to design and realize new front-end radar architectures exploiting time domain. In fact, many modern radar applications, as, for example, Time Modulated Array and High Power Devices [1–3, 5–6] require switches as much ideal as possible. Consequently, it is required a very...
This letter shows that, by proper use of time modulation in equispaced linear arrays with uniform excitation distribution, it is possible to maintain the Sidelobe Level of the radiated power pattern under a - previously stipulated - upper bound whereas, the undesired harmonics are minimized. This approach is used successively in the synthesis of a sparse array's structure with widely promising results.
In this contribution an innovative non-invasive technique for water monitoring is presented. The effectiveness of the proposed tools and algorithms have been confirmed by experimental results, achieved at Laboratory of Water Engineering, University of Cassino (FR). The proposed techniques belong to the class of non-invasive electromagnetic methods, as the ones based on Ground Penetrating Radar (GPR).
In this paper the antenna synthesis problem by involving the minimum number of sensors is considered from a new and interesting perspective, based on the compressive sensing theory. The Compressive Sensing (CS) theory asserts that one can recover certain signals from fewer samples than the traditional methods. To get such a result, the CS relies on two important principles: sparsity, which pertains...
In many modern radar application, as, for example, Time Modulated Array or High Power Devices [1-3, 5-6], the availability of switches with very low transition time, very low light resistance, very high dark resistance and supporting high powers are required. The objective of this work is to design a photoconductive switch able to generate short pulses with very high amplitude for designing new front-end...
In this letter paper is shown that, starting from a proper use of the time modulation, applied to equispaced linear arrays with uniform excitation distribution, it is possible to control the Sidelobe Level of the average radiated power pattern under a - previously stipulated - upper bound and jointly minimizing, the undesired harmonics called Sideband Radiations (SR). This approach, on Simulated Annealing...
The energy harvesting scheme proposed in the paper is characterized by the rectenna system. RF radio frequency energy harvesting technique is an emerging as environmental energy sources, which form a promising alternative to existing energy resources. In the wireless power transmission, one of the most important components is the rectifying antenna, called rectenna in the open literature. It is composed...
The canonical problem of realizing far field power patterns subject to arbitrary upper and lower bounds by optimizing both excitations and locations of the different antennas of an array is addressed. Some possible design strategies are outlined and discussed, and preliminary results are shown in support of the given theory.
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