The fast dipole method (FDM) in conjunction with the asymptotic waveform evaluation (AWE) technique is presented for fast calculation of radar cross section (RCS) from arbitrarily shaped perfect electric conductor tar...
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ISBN:
(纸本)9781467317993
The fast dipole method (FDM) in conjunction with the asymptotic waveform evaluation (AWE) technique is presented for fast calculation of radar cross section (RCS) from arbitrarily shaped perfect electric conductor targets over a broad frequency band. The FDM, which is based on the equivalent dipole-moment (EDM) method, is employed to reduce impedance matrix storage and accelerate the matrix-vector multiplications in the solutions of the Taylor coefficients. The application of AWE technique enables fast frequency sweep analysis. The numerical results show that this method greatly increased the computational efficiency without losing accuracy conditions compared with the traditional method of moments (MoM) combined with AWE technique.
An analytical solution is presented to compute the field distribution near a chiral cylinder surface at normal incidence of an on-axis Gaussian beam. The theoretical analysis of the scattering problem is complicated d...
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ISBN:
(纸本)9781467317993
An analytical solution is presented to compute the field distribution near a chiral cylinder surface at normal incidence of an on-axis Gaussian beam. The theoretical analysis of the scattering problem is complicated due to the fact that the left and right circularly polarized waves propagate in the chiral medium with different propagation constants. Numerical results for the normalized near-surface field intensity are given and discussed concisely.
The TD-SCDMA relay (repeater) provide network operators with a cost-effective means of extending coverage to areas of low signal strength. The maximum gain of a TD-SCDMA repeater is, however, limited by the amount of ...
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ISBN:
(纸本)9781467317993
The TD-SCDMA relay (repeater) provide network operators with a cost-effective means of extending coverage to areas of low signal strength. The maximum gain of a TD-SCDMA repeater is, however, limited by the amount of isolation that exists between the donor and coverage antennas. The radio echoes from coverage antennas not only create interference in the incoming signal from the base station, but also cause instability of the repeater. In this paper, we present an interference cancellation system (ICS) for TD-SCDMA networks, which can eliminate these problems. Various characteristic features of the ICS are illustrated using the MATLAB simulation results.
The method of splitting a plane-wave finite-difference time-domain （SP-FDTD） algorithm is presented for the initiation of plane-wave source in the total-field / scattered-field （TF/SF） formulation of high-order sy...
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The method of splitting a plane-wave finite-difference time-domain （SP-FDTD） algorithm is presented for the initiation of plane-wave source in the total-field / scattered-field （TF/SF） formulation of high-order symplectic finite- difference time-domain （SFDTD） scheme for the first time. By splitting the fields on one-dimensional grid and using the nature of numerical plane-wave in finite-difference time-domain （FDTD）, the identical dispersion relation can be obtained and proved between the one-dimensional and three-dimensional grids. An efficient plane-wave source is simulated on one-dimensional grid and a perfect match can be achieved for a plane-wave propagating at any angle forming an integer grid cell ratio. Numerical simulations show that the method is valid for SFDTD and the residual field in SF region is shrinked down to -300 dB.
Fast Fourier Transform (FFT) is a well known and widely used tool in many scientific and engineering fields. CUFFT, which is the NVIDIA's FFT library included in the CUDA toolkit, supports double precision FFTs. H...
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Compressive imaging is an important application of the compressive sensing theory. This paper proposes a novel compressive double-lens imaging method with circulant-circulant-block phase mask matrices to implement ima...
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Compressive imaging is an important application of the compressive sensing theory. This paper proposes a novel compressive double-lens imaging method with circulant-circulant-block phase mask matrices to implement image acquisition. Simulation results show that the novel phase mask matrices can effectively capture the information of image with a significant reduction of measurements. For the standard Lena and Cameraman images both with 64-by-64 pixels, the number of measurements is only 58.6% of all pixels, and the reconstructed signal-to-noise ratios exceed 26 dB and 30 dB, respectively. The new research provides more supports for deterministic measurement in the application of compressive imaging, which has more advantages than toeplitz and circulant matrices, reduces the difficulty and cost of the physical realization and provides some theoretical, computing and technical supports for new design of camera.
Power quality is the guide to the power of equipment malfunction or cannot work normally voltage. Rapid use, to the electric power quality caused serious, destruction and pollution power quality, produce the voltage w...
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Power quality is the guide to the power of equipment malfunction or cannot work normally voltage. Rapid use, to the electric power quality caused serious, destruction and pollution power quality, produce the voltage wave and so on many kinds of power quality problems, to the user and power supply party bring huge economic loss "at the same time to plan. Microprocessor as the core of the intelligent precision equipment to the electric power quality put forward higher requirement, how to effectively can quality problem, improve the quality of power become the electric power industry research hotspot and focus of power quality inspection Richard and improve the quality of power, the prerequisite and basis of only fast. The correct detection and recognition of the electrical energy to take the right management measures improve the quality of power;reduce the loss of power quality problems.
A high-order symplectic FDTD (SFDTD) framework for solving the time-dependent Schrödinger equation is established. The third-order symplectic integrators and fourth-order collocated differences are employed in th...
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A high-order symplectic FDTD (SFDTD) framework for solving the time-dependent Schrödinger equation is established. The third-order symplectic integrators and fourth-order collocated differences are employed in the time and space domains, respectively. The stabilities and numerical dispersions of FDTD(2,2), higher-order FDTD(2,4), and SFDTD(3,4) schemes are analyzed. We found that the stability limit of the SFDTD(3,4) scheme can be larger than that of the traditional FDTD(2,2) method through careful optimization of symplectic integrators. Moreover, the SFDTD(3,4) scheme and the FDTD(2,4) approach show better numerical dispersions than the traditional FDTD(2,2) method.
Brain-computer interface (BCI) which transforms signals from the brain into control signals can help people with disabilities communicate with others. In this paper, posteriori probability support vector machine (PPSV...
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Phase retrieval technique using the directly measured intensity distribution to recover phase information and reconstruct the wave function is an important area of optics and image processing. Taking advantage of the ...
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Phase retrieval technique using the directly measured intensity distribution to recover phase information and reconstruct the wave function is an important area of optics and image processing. Taking advantage of the existing phase retrieval based on transport equation of intensity, the light propagation model consistent with the principle of general camera images in natural light conditions is established, the corresponding optical data collection platform is designed and a phase retrieval method in this new model is derived. Real experimental results verify that this new phase retrieval method is reasonable and correct. The application of traditional phase retrieval algorithm on transport equation of intensity is extended to the holographic display and other macro-areas.
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