低可探测性目标电磁散射特性测试中的若干基础问题研究

随着我国目标隐身技术的发展和应用，对全尺寸低可探测性目标的电磁散射特性测试和性能评估技术提出了迫切需求。目前国内对外场条件下低可探测性目标电磁散射特性测试与处理中的若干基础问题尚未开展系统性研究，而先进国家长期以来在该领域对我实行技术禁运，严重影响了我国相关技术的发展。针对这一现状，本课题将系统地开展外场地平场条件下电磁散射测试中若干基础问题研究。基于目标宽带电磁散射的幅相测量，建立外场测量、背景相减与雷达散射截面(RCS)定标处理的精确数学模型；通过理论分析、数值仿真和外场测量试验验证，形成分析影响外场测量不确定度主要因素的方法，发展用于提高外场测量精度的技术和信号处理方法、算法。期望通过本项研究，在一定程度上打破国外技术封锁，突破若干技术瓶颈，满足我国的迫切技术需求，为显著提高我国低可探测性目标电磁散射测量与处理的技术水平提供理论模型、测量方法和信号处理算法支持。

With the development and applications of stealth technology， more and more requirements for electromagnetic (EM) scattering measurement and performance evaluation of full-sized low observable targets appear. It is recognized that there exist two cases which severely limit the technique development of EM scattering measurement and processing for low observable targets. The first is that up to this point, the investigation of several fundamental issues for outdoor range test were still not systematically conducted. The second is that radar cross section (RCS) techniques were strictly forbidden to be output to China by the western countries. To meet with the ever increasing technical needs, the current research proposal suggests that the several fundamental issues for outdoor ground plane range tests of low observable targets are to be investigated. Based on the amplitude and phase measurement for target wideband EM scattering,exact mathematical models for outdoor scattering measurement, background vector subtraction and RCS calibration are to be formulated. Through theoretical analysis, numerical simulation as well as outdoor range test and validation, critical factors and formulation for outdoor measurement uncertainty analysis are to be obtained. Methods，techniques and algorithms for outdoor EM scattering measurement accuracy enhancement are to be developed. It is expected that the completion of the proposed research will lead to the breaking of both technique forbidden from the western countries and several technique bottlenecks. The application of research results will also meet with the urgent needs for outdoor EM scattering test and evaluation of low observable targets, as well as provide with technique support in theoretical models, measurement methodology and signal processing algorithms.