Simulation on bistatic RCS measurement method in anechoic chamber

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.