Simulation on bistatic RCS measurement method in anechoic chamber
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摘要: 阐述了在微波暗室内使用紧缩场和平面近场扫描测量双站RCS(Radar Cross Section)的方法,并用天线耦合公式、平面波综合和等效原理将近场变换到远场.分析了采样、有效角域和窗函数对测量性能的影响.半波长的采样可满足测量的要求,欠采样会侵蚀有效角域范围.虑及综合口径的等效投影,完善了有效角域的估计公式.驻相法分析了近远场变换对近场的近似局部依赖性.并且使用窗函数来抑制扫描截断误差,提高测量精度.最后,通过数值算例验证了测量方法和性能分析的有效性.Abstract: An method was presented to measure bistatic RCS in anechoic chamber. The target was illuminated by compact antenna test range (CATR), and the scattered field was probed in near-field. The transformation from near-field to far-field (N2F) was analyzed by antennas coupling equation, plane wave synthesis and equivalence theorem. Sampling rate, maximum angle and taper function in N2F were formulated to analyze the measurement-s performance. The sampling interval needs to be half wavelength, and undersample will worsen the maximum angle. The maximum angle-s estimation was perfected using the synthetic aperture-s projection. Far-field was determined by localized near-field approximatively, which can be concluded using stationary phase method. A taper function was applied to the near-field data that reduces the error of the scanning truncation. The method was validated through numerical example finally.
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Key words:
- near-field /
- radar cross section (RCS) /
- anechoic chamber
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