Fei-Qun Y.,National Key Laboratory on Blind Signal Processing |
Shang-Fu Y.,National Key Laboratory on Blind Signal Processing
IEEE Antennas and Wireless Propagation Letters | Year: 2013
The Galerkin moment method based on triangular sinusoidal currents is proposed. Its basis function is a modified version of Rao-Wilton-Glisson (RWG) vector basis function when the meshed triangles are modeled by bilinear interpolated parametric surfaces under particular oblique linear local coordinates. Because of the adoption of sinusoidal factor in the current basis function, the fourfold impedance integrals reduce into double integrals, while the double potential integrals reduce into only one dimensional integrals. The integrand of the remaining double impedance integral involves complex exponential integrals, which does not bring any computation benefit to the total quadrature time for the moment. However, the remaining one-dimensional potential integrals make it rather effective to do scattering modal analysis or near-zone energy flow analysis after solving the matrix equation. In either scene, there is a requirement for frequent calculation of the near- or far-zone fields of complex surface objects. The proposed method is applied to scattering problems of conducting square plate and sphere illuminated by a plane wave. The computed surface currents agree very well with results via RWG Galerkin method, and the method also has a little superior convergence rate. © 2002-2011 IEEE.
Yao S.,National Key Laboratory on Blind Signal Processing |
He Q.,National Key Laboratory on Blind Signal Processing |
Xiong J.,National Key Laboratory on Blind Signal Processing
Chinese Journal of Sensors and Actuators | Year: 2012
The scale similarity describing the geometry and TDOA measurement precision between real scenes and geometric scale model of passive TDOA location system are derived. The scale relationship between the bandwidth, the accumulated time, the transmit power and the TDOA measurement precision of signal with rectangle-shaped spectrum is analyzed. And the scale relationship between the bandwidth, the accumulated time, the transmit power and the location precision is discussed, with ignoring the inherent system error. The results show that, in the geometric scale model, the location errors will be reduced on the same scale, the relative error remains unchanged, when the inherent system error can be ignored; and the location errors remains the same, the relative error is in the same proportion as geometric scale factor, when the TDOA measurement precision keeps unchangeably. The experimental results verify the above conclusions.