一种复合微动空间目标窄带成像方法  

Narrow-band imaging method for compound micro-motion space target

作　　者：侯艳斐[1] Hou Yanfei(Luliang University,Lvliang 033000,China)

机构地区：[1]吕梁学院,吕梁033000

出　　处：《电子测量与仪器学报》2021年第3期225-231,共7页Journal of Electronic Measurement and Instrumentation

基　　金：山西省高等学校科技创新项目(2019L0981)资助。

摘　　要：提出一种复合微动空间目标窄带成像方法。由于窄带雷达在目标检测和跟踪等方面的优势,窄带雷达被广泛用于空间目标探测中。对空间微动目标,微动产生时变多普勒调制,蕴含了目标的重要结构信息,通过对时频图像应用逆约旦变换方法可获取目标各散射点的位置,实现窄带成像。窄带成像降低了对雷达带宽的要求,在空间目标探测上具有优势。然而,在实际探测场景中,目标运动表现为微动和平动的复合叠加,使窄带成像方法失效。在建立复合微动空间目标雷达回波模型的基础上,分析目标的时变多普勒调制特性,提出一种复合微动窄带成像方法,该方法首先基于时频相关系数估计微动周期,利用多普勒相消方法去除平动影响,估计目标平动参数,进而实现平动补偿,最后基于逆约旦变换方法实现窄带成像。所提方法不受目标平动影响,能有效实现复合微动空间目标的窄带成像。A narrow-band imaging method for space target with compound micro-motion is proposed. Due to the advantages of narrow-band radar in target detection and tracking, narrow-band radar is widely used in space target detection. For space target with micro-motion, there is time-varying Doppler modulation induced by micro-motion, which contains the important structural information of the target. By applying the inverse Radon transform(IRT) method on the time-frequency image, the position of scattering centers of the target can be obtained and the narrow-band imaging can be achieved. Narrow-band imaging reduces the requirement of radar bandwidth and has advantages in space target detection. However, in the real detection scene, the target motion is composed of micro-motion and translation, which makes the narrow-band imaging method invalid. In this paper, based on the radar echo model of space target with compound micro-motion, the time-varying Doppler modulation characteristics of the target are analyzed, and a narrow-band imaging method for compound micro-motion is proposed. Firstly, the micro-motion period is estimated based on the time-frequency correlation coefficient. Then the translational influence is removed by the Doppler cancellation method, the target translational parameters are estimated, and then the translational compensation is achieved. Finally, the narrow-band imaging is achieved based on the IRT. The proposed method is not affected by the target translation, and can effectively achieve the narrow-band imaging for space target with compound micro-motion.

关 键 词：复合微动 空间目标 窄带成像 

分 类 号：TN95[电子电信—信号与信息处理]