外场RCS测量中背景杂波抑制技术研究

Research on Technology of Background Clutter Suppression in Outdoor RCS Measurement

针对实际外场环境下军事目标RCS测量中背景杂波抑制需要,在背景矢量相减、软硬件距离门控制等背景杂波抑制技术基础上,将背景矢量相减后的目标回波频域数据作IFFT变换,得到一维高分辨率距离像,再根据目标区位置、尺寸等参数,选择合适的时域加窗信号,将加窗后的距离像再作FFT变换到频域,最后将一维距离像反演得出目标RCS值。实际外场测试结果表明,综合应用背景杂波抑制技术能够提高RCS测量的信噪比和精度。

For the need of background clutter suppression in outdoor RCS measurement of military target,on the base of the background clutter suppression technologies including background vector subtraction and software and hardware distance door control,the frequency domain data of target echo after background vector subtraction was transformed by IFFT to obtain one-dimensional high-resolution range profile,and then the appropriate time-domain windowed signal was selected according to the location,size and other parameters of target area.The windowed range profile was transformed into frequency domain by FFT,and the RCS of the target was obtained by one-dimensional range profile inversion.The results of outdoor tests indicate that the background clutter suppression technologies in this paper can enhance the SNR and the accuracy of RCS measurement.