大斜视滑动聚束方位向波束指向控制策略  

Azimuth Beam-pointing Control Strategy for Large Squint Sliding Spotlight Mode

作　　者：陈郅航 王辉 郑世超 吴思利 汤叶科 王咏祺 张金翼 CHEN Zhihang;WANG Hui;ZHENG Shichao;WU Sii;TANG Yeke;WANG Yongqi;ZHANG Jinyi(Shanghai Institute of Satellite Engineering,Shanghai 201109,China)

机构地区：[1]上海卫星工程研究所,上海201109

出　　处：《上海航天（中英文）》2023年第6期83-89,共7页Aerospace Shanghai（Chinese&English）

基　　金：国家自然科学基金(U22B2015)。

摘　　要：对星载电扫合成孔径雷达斜视滑动聚束模式,采用传统波束扫描策略中出现的方位向分辨率沿方位向空变大及方位扫描角度过大的问题展开研究。首先,分析采用传统斜视滑动聚束扫描策略情况下,方位向分辨率沿方位向出现空变的原因,探究方位向分辨率与扫描策略、扫描角度的关系。然后,提出基于全局搜索增强鲸鱼优化算法的斜视滑动聚束波束扫描策略,控制不同时刻下的方位向扫描角速度,降低方位向分辨率沿方位向的空变程度,减小天线最大方位向扫描角度,缩短数据录取时间,有效降低系统代价,提升系统性能。最后,通过仿真验证所提策略的有效性,方位向分辨率空变降低至1%以下,数据录取时间与总扫描角度相较于原有方法降低10%以上。When the traditional beam scanning strategy is applied to the squint sliding spotlight mode of spaceborne electronically scanned synthetic aperture radar(SAR),there are usually two problems.One is that the azimuth resolution becomes larger along the azimuth,and the other is that the azimuth scan angle is too large.This paper aims to solve such problems.First,the cause of spatial variation of the azimuth resolution along the azimuth with the traditional squint sliding spotlight scanning strategy is analyzed,and the relationship between the azimuth resolution and the scanning strategy/scanning angle is explored.Then,a squint sliding spotlight beam scanning strategy based on the global search enhanced Whale optimization algorithm is proposed.By controlling the azimuth scanning angular velocity at different moments,the spatial variability of azimuth resolution along the azimuth,the maximum azimuth scan angle of the antenna,and the data acquisition time are reduced,the system cost is effectively reduced,and the system performance is improved.Finally,the effectiveness of the proposed method is verified by simulation.Compared the results obtained by the traditional strategy,the spatial variation of azimuth resolution obtained by the proposed strategy is reduced to less than 1%,and the data acquisition time is reduced by more than 10%.

关 键 词：滑动聚束 波束扫描 分辨率空变 系统代价 全局优化 

分 类 号：TN911.73[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]