步进频雷达成像技术研究进展

Advances in Stepped-Frequency Radar Imaging Technology

步进频雷达发射窄带脉冲,利用多个脉冲合成宽带成像,对发射、接收分系统和信号处理平台的要求相对较低,是获得目标高分辨距离像的一种有效技术手段。从雷达系统设计和工程应用的角度出发,对目前国内外研究提出的具有代表性的几种步进频成像频域方法和时域方法进行了论述;介绍了不同处理方法在雷达波形和工作方式设计、合成宽带成像的性能、工程实现难度和适用任务场景等方面的优点和不足;探讨了各种方法工程应用的可能性。相对于其他方法,一种基于子脉冲去斜的步进频合成宽带方法在工程上更易于实施。

Stepped-frequency radar transmits narrowband pulsed signals and gets HRRP （High Range Resolution Profile） images through synthesizing multiple pulses.As an effective means to get HRRP of targets,it has relaxed requirements on the performance of transmitters,receivers and signal processing systems.For the sake of design and engineering applications of radar systems,typical frequency-domain methods and time-domain methods for HR RP imaging via stepped-frequency waveforms studied by Chinese and foreign researchers are discussed.The advantages and disadvantages of each method in design of radar signals and operation modes,performance of HRRP image synthesizing,degree of difficulty in implementing and applicable scenes are presented.Finally,feasibility of engineering applications of each method is analyzed.Relatively speaking,a dechirp-based method is favorable in terms of ease of implementation.