应用渐近波形估计技术快速计算宽带雷达散射截面

将渐近波形估计技术应用到矩量法中,计算了任意形状二维理想导体目标的宽带雷达散射截面.计算中使用矩量法和奇异值分解技术求解电场积分方程,得到一展开频率点的表面电流密度,通过Padé近似求出给定频带内任意频率点的表面电流密度分布,进而计算出散射场和雷达散射截面.奇异值分解技术的使用消除了电场积分方程的内谐振问题.对数值计算结果与矩量法逐点求解的结果进行了比较,两者吻合良好,且计算效率提高了约一个数量级.

FAST COMPUTATION OF WIDE-BAND RADAR CROSS SECTION USING ASYMPTOTIC WAVEFORM EVALUATION TECHNIQUE

The asymptotic waveform evaluation (AWE) technique was applied to the method of moments to calculate the radar cross section (RCS) of an arbitrarily shaped two dimensional perfect electric conductor over a wide frequency band. The method of moments and the singular value decomposition technique were used to solve the electric field integral equation, and the surface electric current density for a single frequency was obtained. In the AWE technique, the surface current on the perfect electric conductor is expanded in a rational function via the Padé approximation. Using the function, the electric current distribution can be obtained at any frequency within the given frequency range, which is used to compute the scattered fields and the wide band RCS. The employment of the singular value decomposition technique eliminates the interior resonance problem which suffered from the electric field integral equation. The numerical results are in good agreement with the results obtained by the method of moments at eacch frequncy.The computational efficiency is improved by more than an order of magnitude.