基于矢量对消的缺陷类目标散射试验改进方法

Improved test method based on vector cancellation for scattering characteristic of discontinuous target

缺陷类目标散射在高隐身飞行器总体散射中占有重要地位。目前常用的缺陷类目标散射评估方法是基于低散射载体,将有无缺陷类目标的载体测试结果进行对比,获得缺陷类目标散射的增幅,以分析目标的散射特性。这种方法存在载体影响大、可测量目标尺寸小、成本高等不足。本文提出一种基于矢量对消的改进试验方法,将载体视为目标背景的一部分,通过矢量对消分离出载体散射,从而提取出完全独立于载体之外的全角域范围的缺陷类目标散射特性,结果更为完整、精确。通过文献对比和验证分析,本文方法可以得到缺陷类目标的全角域散射特性,且测试结果、目标尺寸均不受载体限制,具有精确度高、成本低的优点。

For stealth aircraft,the scattering contribution of discontinuous targets becomes considerable.The common method is based on low scattering carrier and compares measurement results of carrier with discontinuity and that without discontinuity. The scattering increase of target with discontinuity is obtained to analyze its electromagnetic scattering characteristic. This method has disadvantages of low efficiency,small-size target and high cost. An improved method is presented based on vector cancellation,which regards carrier as part of target background and separates carrier scattering from result. The scattering characteristic of discontinuous target in whole angle region which is independent of carrier is obtained,and the result is more integrative and more accurate. By comparing with literature and validation analysis,the vector cancellation method can get scattering characteristic of discontinuous target in whole angle region. The test results and target size are unrelated to carrier,so that this method has advantages of high precision and low cost.