A new method called multi-frequency holography (MFH) for two-dimensional radar cross-section imaging of rotating objects is introduced, in which a constant coherent reference signal from transmitted signal is added in...A new method called multi-frequency holography (MFH) for two-dimensional radar cross-section imaging of rotating objects is introduced, in which a constant coherent reference signal from transmitted signal is added into received signal over certain frequency-width. With the MFH only the intensity of received composite signals needs to be measured. Both imaging situations of far field and near field are considered in details. Special restrictions about the MFH are also discussed and simulated by numerical computation. Examples of numerical simulation show that the method is effective, applicable and perspective.展开更多
高精度雷达散射截面(RCS)测量对背景环境具有较高要求,当背景环境存在较强干扰时,通过背景矢量对消难以消除杂波影响。提出基于成像提取的高精度RCS测量方法,从背景杂波中分离和提取出目标的散射信号,从而提高了测量的精度。首先推导了...高精度雷达散射截面(RCS)测量对背景环境具有较高要求,当背景环境存在较强干扰时,通过背景矢量对消难以消除杂波影响。提出基于成像提取的高精度RCS测量方法,从背景杂波中分离和提取出目标的散射信号,从而提高了测量的精度。首先推导了像与RCS的数学关系,然后利用转台模式下的测量回波进行成像处理,得到目标区域的二维像;从成像区域中提取目标的二维像,通过波谱变换和定标获得目标的RCS。仿真结果表明,该方法对于具有干扰情况下的RCS测量,可以改善3~5 d B的测试精度,并且能够对弱散射目标进行测量。实验结果表明了成像提取方法的有效性和准确性。展开更多
文摘A new method called multi-frequency holography (MFH) for two-dimensional radar cross-section imaging of rotating objects is introduced, in which a constant coherent reference signal from transmitted signal is added into received signal over certain frequency-width. With the MFH only the intensity of received composite signals needs to be measured. Both imaging situations of far field and near field are considered in details. Special restrictions about the MFH are also discussed and simulated by numerical computation. Examples of numerical simulation show that the method is effective, applicable and perspective.
文摘高精度雷达散射截面(RCS)测量对背景环境具有较高要求,当背景环境存在较强干扰时,通过背景矢量对消难以消除杂波影响。提出基于成像提取的高精度RCS测量方法,从背景杂波中分离和提取出目标的散射信号,从而提高了测量的精度。首先推导了像与RCS的数学关系,然后利用转台模式下的测量回波进行成像处理,得到目标区域的二维像;从成像区域中提取目标的二维像,通过波谱变换和定标获得目标的RCS。仿真结果表明,该方法对于具有干扰情况下的RCS测量,可以改善3~5 d B的测试精度,并且能够对弱散射目标进行测量。实验结果表明了成像提取方法的有效性和准确性。
