基于耦合目标的近场双站散射测试方法

Near-field bistatic scattering measurement for coupling targets

对于近场散射测试中存在多次耦合目标,从近场数据外推远场雷达散射截面时,需要完备的双站散射信息。传统的双站散射测试方法中,远场观测点的数目等于扫描面上的天线数目,测量所需时间成倍增加,难以工程化。因此,根据截断角域的选取原则,结合采样间隔设计了一种"一发多收结合转台旋转"的近场散射测试方法,用以验证"多发多收"双站模式的近远场外推方法的有效性和误差大小。通过在微波暗室对二面角进行测试,验证了该外推算法的正确性以及实验系统的可行性。

In near field scattering measurement,for acquiring the radar cross section of targets which have multiple interactions,near-field to far-field transformation require the full bistatic near-field measurements.However,with traditional bistatic near-field scattering measurement,it is assumed that the number of observations in far-field is equal to the number of antennas on the scanning plane,which would multiply the time cost and make it hard to be applied in practice.Therefore,a method is proposed to reduce the testing angle region and combine a system consisting of one transmitting antenna,multiple receiving antennas and the rotation of platform,to verify its effectiveness.Finally,the results for testing a dihedral angle in the microwave anechoic chamber have been given to prove its correctness and feasibility.