Alessandro MoriIngegneria dei Sistemi S.p.A., Pisa, Italy · Computational Electromagnetics Laboratory
Alessandro Mori
About
39
Publications
2,316
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
244
Citations
Citations since 2017
Publications
Publications (39)
Due to the large amount of electrical equipment aboard modern aircraft, several EMC problems appear which can be tackled by filtering disturbances at the equipment inputs and shielding cable links (braiding, covering, over-braiding). Among the others, the segregation between interfering cables or bundles of cables becomes crucial to ensure that cou...
Due to the large amount of electrical equipment aboard modern aircraft, several EMC problems appear which can be tackled by filtering disturbances at the equipment inputs and shielding cable links (braiding, covering, over-braiding). Among the others, the segregation between interfering cables or bundles of cables becomes crucial to ensure that cou...
Modern aircraft hosts a large number of electric systems. Due to the transition to a More Electrical Aircraft, future platforms will use even more electric systems. This increases the complexity of the EWIS design from an EMC point of view. When possible, segregation between potentially interfering cables or bundles is a convenient solution to avoi...
Segregation rules are one of the three solutions to overcome EMC problems together with filtering of disturbances at the equipment inputs and shielding of cable links (braiding, covering, over-braiding, etc.). These rules enable mass reduction in the selection of cables and optimal route definition in which compatible cables (having similar levels...
In the framework of the design of low observable aircraft, one of the most difficult problem is the numerical modelling of aeronautical air intakes with an - usually complex - arbitrary shape. Also the presence of radio absorbing material demands for accurate methods in evaluating the low level scattering for real life problems. This paper addresse...
In the framework of the design of low observable aircraft, one of the most difficult problem is the numerical modelling of aeronautical air intakes with an — usually complex — arbitrary shape. Also the presence of radio absorbing material demands for accurate methods in evaluating the low level scattering for real life problems. In this contributio...
This paper presents a rigorous dc solution of 3-D Partial Element Equivalent Circuit models. Despite the decoupling of magnetic and electric fields at dc, the correct solution is not trivial. The proposed one is based on a two-step process where first the magnetostatic problem is solved; then, the electrostatic problem is faced by using the solutio...
This paper describes the approach developed to model the current return networks installed aboard aircrafts having parts made in composite materials. The surface partial element equivalent circuit (PEEC) method is adopted for its high-fidelity modeling capabilities, and its accuracy in the low-frequency region, which is of interest for the characte...
A hierarchical quasi-Helmholtz decomposition, originally developed to address
the low-frequency and dense-discretization breakdowns for the EFIE, is applied
together with an algebraic preconditioner to improve the convergence of the
CFIE in multiscale problems. The effectiveness of the proposed method is
studied first on some simple examples; next,...
The history of discovery of electromagnetic waves and its impact on our life style is presented in the framework of its historical context. Discovery of the relevant equations by James Clerk Maxwell are first commented, and the subsequent applications discussed: wired transmission of electric power, cable transmission of messages via telegraph and...
In this paper, a new iterative full-wave frequency domain PEEC solver is proposed. Based on the classical modified nodal analysis, the convergence of the iterative solution is optimized by resorting to a pertinent scaling of sub-matrices which improves the conditioning of the global left hand side matrix and to a multiscale-based effective precondi...
This paper presents a systematic methodology based on the Partial Element Equivalent Circuit method to model aircrafts in order to characterize their current return network. The state-of-the-art of numerical modeling techniques for electrically large structures is used to allow accurate and fast simulations. The comparison of the numerical results...
This papers describes a fast full-wave technique methodology for the calculation of coupling among large arrays. The technique is exploited by applying it to the evaluation of coupling among two large Vivaldi arrays made by 40×8 and 16×16 elements.
We present a research project, funded by the Italian Space Agency (ASI), aimed at performing 2D and 3D Focusing of COSMO/SkyMed (CSK) SAR Data. We describe the main objectives of the project, briefly illustrate employed techniques, and finally present the obtained results. The latter show that sub-meter resolution can be achieved in the enhanced sp...
The electric field generated by power lines is usually evaluated by a simple 2-D model. Due to the presence of buildings or other objects near the power line, measurements are often in disagreement with the model. In this letter, the adaptive integral method (AIM) is used to analyze a power line in a real environment. The presence of a conducting g...
Moon exploitation is among the next space mission priorities. Earth observation (EO), which is traditionally implemented on artificial lower Earth orbit satellites, can be, in principle, extended to the platform constituted by the natural Earth satellite. With this regard, we investigate the features related to the EO by a possible Moon-borne synth...
Among the next space missions goals the exploitation of the Moon, the natural Earth satellite, is gaining an increasing interest. Colonization of the Moon is along the usual track of human civilization and economic expansion; it is also related to a large number of scientific issues, including Earth Observation (EO). With respect to standard LEO sa...
The adaptive integral method (AIM) is widely used to solve electromagnetic scattering and radiation problems involving large objects in free space. In the presence of one or more perfectly conducting perpendicular planes, the AIM formulation can be applied by exploiting the principle of images at the cost of increasing the number of fast Fourier tr...
The keyword in the actual panorama of large antenna farm and scattering problems modelling is ldquoaccuracyrdquo or, in other words, the concept of ldquohigh fidelity modellingrdquo, the only way to cut development and/or prototyping costs. The integral equation (IE) approach is typically used to manage antenna problems where the accuracy is a basi...
We present an original application of fuzzy logic to restoration of phase images from interferometric synthetic aperture radar (InSAR), which are affected by zero-mean uncorrelated noise, whose variance depends on the underlying coherence, thereby yielding a nonstationary random noise process. Spatial filtering of the phase noise is recommended, ei...
In this letter, we present a Green's function approximation valid in the weak-interaction region that can be used with the sparse-matrix canonical grid (SMCG) method. It can be easily introduced into existing SMCG codes, allowing a reduction in size of the neighborhood region and, consequently, of the dynamic memory and the computation time require...
In this paper, we present a time-domain (TD) raw signal simulator for an interferometric synthetic aperture radar (SAR). We consider the case of a spaceborne SAR operating in stripmap, spotlight, and hybrid modes, but the case of an airborne SAR can be considered as well. The spaceborne platform is considered as traveling on its nominal (Keplerian)...
Three different formulations that allow to extend the BMIA/AIM method to the analysis of large dielectric stratified structures are introduced. These techniques lead to an approximate form of the multilayer Green's function, valid in the region where the thickness of the substrate can be considered small compared to its transverse dimension. This a...
An efficient technique based on the extension of the banded matrix iterative approach (BMIA) to a not canonical grid by using the adaptive integral method (AIM) is presented for the analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled with subdomain triangular patch basis funct...
An efficient technique is presented, based on the application of a multi-resolution (MR) approach to the BMIA/AIM formulation. The BMIA/AIM is an extension of the banded matrix iterative approach (BMIA) to a non-canonical grid by using the adaptive integral method (AIM) and allows an efficient analysis of patch antennas having medium/large or large...
An efficient technique based on the extension of the Banded Matrix Iterative Approach (BMIA) to a non-canonical grid by using the Adaptive Integral Method (AIM) is presented for the analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled by means of triangular elements.
An efficient technique based on the extension of the banded matrix iterative approach (BMIA) to a BMIA not canonical grid (BMIA/nCAG) is presented for an efficient analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled by means of triangular elements.
An efficient technique based on two-dimensional Fast Fourier Transform (FFT) and linear interpolation is presented for the evaluation of the scattering by a rough terrain surface which is of interest in remote-sensing applications characterized by a very large correlation length. Such technique, where introduced in a BMIA/CAG method, can reduce the...
(Interferometric) SAR signal simulation is very useful to test
processing algorithms of real data. A simulator can provide a reliable
version of signals received by a particular system, when the geometric
and the electromagnetics characteristics of targets are fixed. The
authors present a simulator for an interferometric (single-pass) SAR
system pl...
An efficient technique based on the fast Fourier transform (FFT) and linear interpolation is presented for the evaluation of the scattering by a rough terrain profile with very large correlation length. If introduced in a BMIA/CAG method, it can reduce the computation time significantly. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20:...
Extraction of topographic digital elevation model (DEM) by interferometric data requires recovering of interferometric phase value from its principal value (measured). This is carried out by phase unwrapping algorithms. The author proposes an iterative weighted least square phase unwrapping, where weights are estimated directly from input interfero...
Simulation of raw signals scattered from known targets is in general useful to evaluate and optimize SAR processor and/or SAR images processing chain performance. In this paper is presented a raw signal simulator for spaceborne Synthetic Aperture Radar systems, that take into account the real orbit of the platform (the kepler's nominal one). A phys...
Extraction of topographic Digital Elevation Model (DEM) by
interferometric data requires the recovering of an interferometric phase
absolute value from its principal value (measured). This is carried out
by appropriate algorithms called phase unwrapping algorithms. The
authors propose a phase unwrapping algorithm that estimates phase
gradient by a...
Digital communication systems using Trellis Coded-Continuous Phase Modulations (TC-CPM) have been shown to be power efficient, both for coherent and incoherent detection. In this paper some techniques for the incoherent detection of TC-CPM signals in a radio-mobile environment are studied. Two different differential decoding algorithms for the dete...
A formulation that allows the extension of the BMIA/AIM method to the analysis of large patch antennas on multilayered structures is presented here. This tech-nique leads to an approximate form of the multilayer Green's function, valid in the region where the thickness of the substrate can be considered small compared to its transverse dimension. T...
In this paper, we present the results of the joint application of the BMIA/AIM formu-lation and of the Dual-Isoscalar Multi-Resolution (DIS-MR) approach to the analysis of large arrays. The BMIA/AIM method is an extension of the Banded Matrix Iterative Approach (BMIA) to a non-canonical grid using the Adaptive Integral Method (AIM) and allows an ef...
Projects
Project (1)
In the context of Electric Wiring Interconnection System (EWIS), the installation directives and specifications are generally provided by airframers to suppliers. They comply with recent certification specification and implicitly guarantee the reliability of the system. These specifications are coming from a long term experience in aeronautical industry. However, the applied good practice design and installation rules suffer from fast technological evolution in aeronautical industry (lightweight composite materials, generalization of electrification of functions on board aircraft, etc.) and industry evolution itself (development cycle, productivity, reduction of the number of physical prototypes, etc.).
These rules concern the allocation of cables in bundles (segregation in routes depending on criticity of electrical functions), the relative geometry of routes of bundles (spacing and height between routes...), the size of bundles, the cable function and loads. Those rules depend on the airframer and generally on the aircraft.
Controlling EWIS reliability in today aeronautical industry cannot be managed by good practice rules only. Aircraft industry needs reliable Tools and Methods for managing the wiring complexity of the wiring installed in new generation of aircraft.
In this context, the ANALYST’s objective is double.
In the first hand ANALYST aims at developing and validating electromagnetic (EM) numerical Tools and Methods for optimizing a very important installation concern: the minimum distance between bundles. This distance must guarantee the absence of EM susceptibility for an acceptable set of bundle parameters (constitution and geometry, crossing angle...). From a mathematical perspective, the distance must be determined with the highest possible level of confidence..
On the other hand, in some particular configurations, the minimum distance is not achievable because of the limited room available. It is then mandatory to derogate to this absolute parameter. ANALYST aims at evaluating the level of confidence associated with this derogated distance.
The minimum distance rule must be numerically evaluated on a generic configuration. In both situations, absolute and derogated, the minimum distance will be determined on a simple configuration of two straight bundles having the same length. Then the robustness of this rule will be evaluated on complex and realistic cable-bundles.
This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 821128
