空间进动目标动态散射特性的实验研究

研制了进动目标模型,构建了紧凑场微波暗室动态测量系统,通过暗室实验的方法研究了空间进动目标的动态散射特性,给出了若干典型条件下的全极化宽带测量结果。通过实验可以观察到目标进动引起的多普勒频移,证明了微波雷达对进动目标微多普勒的可观测性,同时观察到弹头常见结构引起的非理想点散射现象。实验结果的分析表明,该实验系统能够有效地揭示进动目标的目标特性和回波调制特性,从而为弹道中段目标的动态电磁散射特性、目标结构反演、运动参数提取和逆合成孔径雷达(ISAR)成像的研究奠定了基础,对于弹道中段目标识别的研究具有重要的意义。

Experimental Study on Dynamic Scattering Properties of Space Precession Target

The dynamic scattering properties of a space precession target are studied through measurement experiments in a microwave anechoic chamber. A precession target model is designed based on the structure and the motion characteristics of a warhead in the ballistic midcourse. A dynamic measurement system is constructed in the microwave anechoic chamber, and then a full-polarization wide-band dynamic measurement experiment is conducted via the system. The results of typical conditions are given. That the Doppler shift induced by the precession is observed from the experimental results demonstrates the observability of the micro-Doppler of the precession target by microwave radar. The non-ideal scattering centers caused by the normal structure of the warhead are also observed. The results show that the experiment system can effectively reveal the target properties and the modulation of the echo of the precession target, which are the foundations of the research on the dynamic electromagnetic scattering properties, the geometrical structure retrieval, the extraction of motion parameters and the inverse synthetic aperture radar (ISAR) imaging of the target in ballistic midcourse. The experiment is of significant value to the research of target recognition in ballistic midcourse.