地物背景下的运动目标频域带宽合成方法

在频率步进雷达中，利用带宽合成技术进行距离成像，具有距离像不模糊范围大、栅瓣电平低等优点。但对地物杂波下的运动目标成像时，距离像信杂比低，并且栅瓣电平对多普勒频移很敏感。提出一种改进的频域带宽合成方案。首先研究了多普勒域抗杂波的参数设计问题，然后设计了二维杂波滤波器实现了抗杂波，最后利用脉间相参处理后的信号特性提出了一种运动补偿方法,有效抑制了距离像的栅瓣电平。外场试验结果验证了方案的优势。

Frequency domain bandwidth synthesis method for moving targets in ground clutter

In stepped frequency radar, range profiling via bandwidth synthesis has advantages such as constructing range profiles with large unambiguous extent and low grating lobes. However, when profiling a moving target in ground clutter, the signal to clutter ratio of the range profile is low and its grating lobe level is sensitive to Doppler shifts. Therefore, an improved bandwidth synthesis scheme is proposed. Firstly, a parameter design for Doppler domain anti clutter is studied. Then, a 2 D clutter filter is designed to eliminate clutter. Finally, a motion compensation method derived from the signal properties after inter pulse coherent processing is proposed, which suppresses the grating lobe level of the range profile effectively. Results from a field experiment verify the advantages of the proposed scheme.