Volume 34 Issue 04
Apr.  2008
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Fang Xiang, Su Donglin, Liu Yanet al. Influence of pixels to graphical electromagnetic computing accuracy and its solution methods[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(04): 373-376. (in Chinese)
Citation: Fang Xiang, Su Donglin, Liu Yanet al. Influence of pixels to graphical electromagnetic computing accuracy and its solution methods[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(04): 373-376. (in Chinese)

Influence of pixels to graphical electromagnetic computing accuracy and its solution methods

  • Received Date: 03 Apr 2007
  • Publish Date: 30 Apr 2008
  • In graphical electromagnetic computing (GRECO), the image rendering resolution was adjusted to improve the physical optics (PO) integral evaluation accuracy. In the PO integral calculation, the visible scattering surface was approximated by flat panels at the pixel level. Therefore the PO integral was evaluated numerically by using a GRECO formula which is equal to the coherent addition of the contribution from all the pixels in the target image. The electrical size of screen cell per pixel was bounded with a maximum Nyquist spatial sampling interval, thus a GRECO image resolution determination criteria which meets the precision requirement of high-frequency RCS calculation was suggested, followed by an image resolution adjusting implementation. Illustrative numerical results for a canonical and a complex targets were presented, which demonstrate the validity of the GRECO image resolution determination criteria.

     

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