A flexible approach using the genetic algorithm (GA) is proposed for array failure correction in digital beamforming of arbitrary arrays. In this approach, weights an are represented directly by a vector complex numbers. The decimal linear crossover employed so that no binary coding and decoding necessary. Three mating schemes, adjacent-fitness-paring (AFP), best-mate-worst (BMW), emperor-selective (EMS), their performances studied. Near-solutions from other analytic or heuristic techniques...

The recently developed event cameras can directly sense the motion in scene by generating an asynchronous sequence of events, i.e., streams, where each individual (x, y, t) corresponds to space-time location when a pixel sensor captures intensity change. Compared with RGB cameras, are frameless but capture much faster motion, therefore have great potential for recognizing gestures fast motions. To deal unique output previous methods often treat streams as time sequences, thus do not fully...

Direction-of-arrival (DOA) estimation in unknown noise environments is an important but challenging problem. Several methods based on maximum likelihood (ML) criteria and parameterization of signals or covariances have been established. Generally, to obtain the exact ML (EML) solutions, DOAs must be jointly estimated along with other signal parameters by optimizing a complicated nonlinear function over high-dimensional problem space. Although computation complexity can reduced via derivation...

An effective numerical method based on wavelet matrix transforms for efficient solution of electromagnetic (EM) integral equations is proposed. Using the transform produces highly sparse moment matrices which can be solved efficiently. A fast construction various orthonormal or nonorthonormal basis also given. It has been found that using nonsimilarity such as cardinal spline (NSNCSW) transform, one obtain a much higher compression rate and better accuracy approximate solutions than...

Passive radar using GSM cellular mobile communication signal had been demonstrated to be feasible for short-range moving target measurements. This paper presents some new results of aircraft measurements with enhanced performance. It is shown that the operation range GSM-based passive can substantially larger than coverage one normal base station cell allocated service. In addition, based on signals received by radar, RCS estimated and a reliable performance prediction performed different...

This paper presents adaptive wide null steering for a digital beamforming (DBF) array with the versatile and powerful genetic algorithm. In this approach, complex weights of DBF are directly coded as chromosomes GA. The GA is able to precisely suppress sidelobe level, using multiple deep nulls-collectively termed null-to cover stretch azimuth directions. Depending on prescribed depth desired suppression, its proximity main beam width null, original level (SLL) pattern can be maintained. More...

A new anisotropic damage model is proposed to describe the mechanical and poromechanical behavior of brittle rocks in drained undrained conditions. Although phenomenological, based on physical grounds micromechanical analysis. Induced represented by a second rank tensor, which related density orientation microcracks. Damage evolution propagation The effective elastic compliance damaged material obtained from specific form Gibbs free enthalpy function. Irreversible damage-related strain due...

Passive radar makes use of an 'illuminator opportunity' already present in the environment for other purposes (TV transmission, broadcast systems, etc) to detect targets as well estimating target parameters. This has merit being a completely covert system, which does not advertise presence either receivers or transmitting stations. One such existing radio transmission that may be utilize this purpose is GSM system. paper intended access feasibility and suitability using downlink signals from...

Passive radar is a special kind of system that utilizes electromagnetic radiation already present in the environment to detect targets as well estimate target parameters. This paper discusses use GSM base station non-cooperative illuminator for bistatic passive operation. The design and implementation this novel introduced. Some initial experimental results show viability using signal ground moving targets.

Multiple-input multiple-output (MIMO) radar has supe- rior performance to conventional one. It been introduced almost every application fleld of in recent years. In prac- tical application, MIMO also faces the problem congested spectrum assignment, which makes it not possible have a continu- ous clear band with large bandwidth. Sparse frequency waveform that contains several individual bands is desirable solution this problem. paper, we propose method design sparse fre- quency set low...

Aiming at maximizing waveform diversity gain when designing a phase-coded multiple-input multiple-output (MIMO) radar set, it is desirable that all waveforms are orthogonal to each other. Hence, the lowest possible peak cross-correlation ratio (PCCR) expected. Meanwhile, low auto-correlation side-lobe (PASR) needed for good detection performance. However, difficult obtain closed form solution set from expected values of PASR and PCCR. In this paper, design problem modeled as multi-objective,...

Presents computer simulations of electromagnetic (EM) absorption and the associated thermal effects in a realistic 3-D human head model under radio frequency (RF) radiation. The is generated from set magnetic resonance imaging (MRI) anatomical slices. Maxwell's equations are solved to obtain harmonic electric field heat potential by using finite difference time domain (FDTD) method. From potentials, steady state biological transfer equation (FD) simulation results Dirichlet boundary...

In this paper, a flexible approach using hybrid particle swarm optimization-genetic algorithm (PSO-GA) is proposed for fast adaptive wide null steering and array failure correction in digital beamforming of arbitrary arrays. Examples are presented to demonstrate the effectiveness approach.

Parameter estimation of internal solitary waves (ISWs) is an important application oceanic synthetic aperture radar (SAR) images. Several methods have been widely applied for estimating the parameters ISWs. Most these assume that ISW signals are corrupted by additive receiver noise. However, in SAR images suffer from both (thermal) and multiplicative (speckle) noises. Therefore, accuracy previously proposed could not reach Cramér-Rao bound (CRB). This paper proposes optimal parameter method...

Abstract A new model for describing induced anisotropic damage in brittle rocks is proposed. Although phenomenological, the based on physical grounds of micromechanical analysis. Induced represented by a second rank tensor, which related to density and orientation microcracks. Damage evolution propagation condition The onset microcrack coalescence leading softening behaviour also considered. effective elastic compliance damaged material obtained from specific form Gibbs potential....

In this paper, the electromagnetic field in air from a radiating horizontal electric dipole located homogeneous isotropic spherical electrically earth coated with N -layered dielectrics is investigated anew. The starting point based on formulas for fields vertical and magnetic dipoles situated above surface of layered dielectrics. complete explicit are derived due to air. By using reciprocity theorem, readily obtained six components radiated by earth.

New method for designing sparse frequency waveform with sidelobe constraint is proposed in this paper. First, optimal power spectrum density (PSD) corresponding to minimum integrated energy (ISE) derived waveform. Then, based on condition, the original problem dealing both PSD requirement and reformulated into a focusing only PSD. In way, has simpler optimization objective function enjoys more efficiency than current methods two requirements. Several techniques are applied design concept...

Being artificial boundary conditions, perfectly matched layer (PML) and absorbing condition (ABC) have their own advantages disadvantages, respectively. In this paper, we present a general formulation of combining curvilinear PMLs conformal ABCs for the finite element analysis electromagnetic scattering problems. The combination exploits eliminates disadvantages so as to decrease number unknowns increase computational efficiency without sacrificing accuracy solutions. Numerical examples are...

This paper presents the investigation of performance Direct Position Determination (DPD) method for emitter source positioning. Single and multiple cases are studied with different system geometries, array configurations locations. MUSIC Maximum likelihood algorithm used to process received data find out possible regions where emitters are. A simple searching is then applied reduce errors final estimated positions. From results, we can see that DPD performs quite well at high Signal-to-Noise...

Iterative adaptive approach (IAA) is a newly proposed nonparametric, least squares based iterative array processing approach, which can provide high resolution spectrum estimation with only few snapshots (even one). This paper investigates the performance of IAA for ground moving target indication using simulation and experimental MCARM data. A important conclusions are attained.

Orbital Angular Momentum (OAM) is recognized as an intrinsic property of Electro-Magnetic (EM) waves.The orthogonality between multiple OAM modes usually exploited to improve the spectral efficiency and transmission rate in wireless communications.In a recent study, we discovered that even when transceivers are stationary, specific spatial Doppler shift can be generated by rotating wavefront structure helical beams.Furthermore, arbitrary integer rotational shifts realized flexibly using...