摘要
中场是指源与目标的距离介于近场和远场之间的范围。暗室内大目标RCS测量很难满足远场条件,但能满足中场条件,中场条件下入射到目标表面的是球面波,如果对测试目标的高度加以限制,那么入射到目标表面的就可认为是柱面波。应用柱面波卷积法实现了中场到远场的外推,修正了非平面波照射所引起的偏差,但精度不够且实现困难,在此基础上,对算法进行了改进,根据中场测得的数据,将两种算法外推后远场的RCS与理论值作了比较,证明了改进算法的有效性。
The middle - field is defined as the distance of source and objective between near - field and far - field. It is important to develop the stealth technology of our country by measuring the RCS of objective accurately. At present, Compact Antenna Test Range （CATR） is used in few institutes, but the cost is very expansive. The far - field condition can not be satisfied when the objective is a little big in anechoic chamber. In this text, a algorithm of extrapolation from mid -field to far -field is put forward by convolution under spherical wave illumination. The deviation caused by quasi - plane wave illumination can be corrected by some experiments.
出处
《陕西理工学院学报（自然科学版）》
2007年第2期17-21,共5页
Journal of Shananxi University of Technology:Natural Science Edition
关键词
RCS
卷积法
中场
远场
RCS
convolution
mid - field
far - field
