A New Technique to Measure RCS of Large Target at Near Distance
In general,RCS measurement must meet the far-field condition,which need a vast measuring area or a costly compact range. To solve the problem,a new technique by extrapolation correction dealing with near-distance RCS measurement of aircraft targets is set up. The RCS of aircraft target under spherical wave illuminating can be adopted to extrapolate far-field RCS of them. The convolution arithmetic utilizing conductive board as a reference target deduces the phase-correction coefficient g(x) between spherical and plane wave,and in fact the convolution calculation of g(x) can be replaced by Fast Fourier Transform,which is related to the scattering field of the reference target measuredInnear-distance,thus the calculating procedure could be completed simply and quickly. By theoretical simulation for a simple target,the RCS extrapolated can be obtained correctly. Experimental results of complex aircraft target show that This new technique makes experiment agree to theory precisely,moreover,it permits the measurement distance reduced by 15 percent of the minimum distance of far-field. Also,there is no serious limitation of measurement for targetIndimension of aperture and depth.
Radio Cross Section (RCS) Convolutionextrapolation Correction coefficient
Chen Weijun Li Nanjing Hu Chufeng Zhang Linxi Tian Jin
UAV Speciality Technique Key Labrotary of National Defense Technology,Northwestern Polytechnieal University,Xian Shaanxi 710072,China
国际会议
2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)
南京
英文
634-636
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）