弹道中段目标多普勒成像算法研究

The Research on Doppler-only Imaging Algorithm of the Mid-course Missile Object

弹道中段目标成像技术是弹道导弹防御系统的核心技术。利用传统的宽带ISAR雷达对弹道中段目标成像无法利用统一的相位补偿函数进行相位补偿,导致成像结果的模糊。该文提出一种提取时频骨架线的信号处理算法,算法通过对提取的弹道中段目标窄带回波的时频多普勒骨架线进行幅度增强,提高目标多普勒成像分辨率,仿真数据和暗室测量数据试验表明,该算法能够实现基于窄带雷达回波多普勒信息的弹道中段目标二维成像。

The midcourse missile imaging method is the key technology for the missile-defense system. Conventional ISAR imaging methods require a uniform function to compensate the phase of the echo. The function is difficult to acquire in the wideband case, so the ISAR imaging result is always smeared. This paper provides a new signal processing algorithm called time-frequency trunk line extraction method. By enhancing the amplitude of the time-frequency doppler which extracted from the narrowband radar return signal, the method improves the doppler imaging resolution effectively. The simulation results and anechoic chamber data of the representative cone-shaped object show that the imaging of the missile target can be obtained from the narrowband radar doppler information using this method.