步进频率雷达基于二次速度估计的高分辨距离像成像算法

The High Resolution Range Profile Imaging Algorithm of the Steppedfrequency Radar Based On the Second Velocity Estimation

随着雷达成像技术日新月异的发展,高分辨率距离像在其中所占据的地位越来越高。本文首先推导了步进频率雷达高分辨距离像的成像原理,然后在分析影响步进频率雷达高分辨距离像成像质量的两个主要因素后,采用两次速度估计的方法解决了步进频率雷达在成像时的速度补偿问题,即先进行快速傅里叶变化获得估计范围再利用脉组求和准则进行精确速度估计,并与常用的频域互相关估计法进行效果比较。同时根据实际雷达系统的测试结果的特点,使用相位解卷绕方法完成成像前相位误差的校正。最后利用试飞院提供的雷达实测数据和仿真实验论证了该步进频率雷达高分辨距离像成像算法的可行性与正确性。

As for the development trend of radar imaging technique, The high resolution range profile （HRRP） has been one of the key technologies. The high resolution range profile imaging theory of stepped-frequency radar has been derived. Then based on analysis of two factors that affect, the high resolution range profile imaging quality of stepped-frequency radar, a method using second velocity estimation based on fast Fourier transform and pulse summation function to solve problems of velocity compensation during imaging process is presented. According to the characteristics of the actual radar system and the test results, phase-unwrapping is used to correct the phase error before imaging process. Eventually this high resolution range profile imaging algorithm of stepped-frequency radar is verified by simulation and measured data.