基于匹配度的闪烁HRRP谱特征分析

Analyses of the Spectra Features of Speckled HRRP Based on the Matching Score

在未发生散射点越距离单元走动(Moving Through Range Cell,MTRC)的角域内,闪烁现象是导致高分辨距离像(High Resolution Range Profile,HRRP)波动的主要原因。该文基于匹配度准则定量分析闪烁时HRRP常用谱特征(幅度谱、功率谱及高阶谱)的变化规律,比较各种谱特征受闪烁影响的强弱及原因,以获得定量的结论指导谱特征的选择。蒙特卡罗实验和暗室实测数据均表明:闪烁对HRRP谱特征的影响与闪烁散射点在目标能量中所占比重、闪烁区间的远近有关;除此之外,闪烁对高阶谱的影响还与高阶谱的阶数有关;常用谱特征中,功率谱受闪烁的影响最弱。

Speckle makes High Resolution Range Profile（HRRP） fluctuate largely within the frame without scatterer Moving Through Range Cell（MTRC）.This paper makes use of the matching score to measure the speckle＇s influence on the spectra features of HRRP,such as the amplitude spectra,power spectra and higher order spectra.Then,the results are analyzed to obtain some conclusions for the selection of spectra features.The Monte Carlo experiments and measured data from an anechoic chamber indicate that the speckle makes spectra features of HRRP fluctuate according to the energy ratio of the speckled scatterers and the speckled segment.Meanwhile, the fluctuation of higher order spectra caused by the speckle also depends on the order.In the common spectra features of HRRP,power spectra are the most insensitive to the speckle.