文中探讨了在导弹下降飞行过程中多普勒波束锐化(DBS)的回波信号特性和成像特点。根据建立的DBS工作几何模型,推导了目标距离表达式,讨论了目标距离的时间变化特性和工作过程多普勒参数的变化,以及各重要参数的选取问题,采用重频不变FFT法对点目标阵进行成像。由于在整个成像过程中,弹体高度不断下降,成像存在几何失真。

The characteristics of echo and imaging of Doppler beaming sharpening during the missile's descending flight were discussed. According to the built geometric model, target range expressions were deducted, and the features of range variation with time and Doppler parameter variation with operation time were analyzed, and then the key parameters were also described. In the paper, an algorithm FFT with a constant pulse repeat frequency was adopted and the imaging was simulated. Due to the attitude of missile decreasing during the whole time, geometry distortion existed in the imaging.