摘要
目前,星载SAR的渐进扫描(Terrain Observation by Progressive Scans,TOPS)成像模式承担有宽幅成像的重要任务,本文将偏置相位中心的方位多通道(Displaced Phase Center Multiple Azimuth Beams,DPCMAB)技术与其结合,以实现一种更高分辨率的宽幅成像体制。由于波束在距离向和方位向存在周期性扫描,对该体制进行常规的系统设计外,还应考虑多块区域的综合成像效果与拼接效果。本文还提出一种方位多通道TOPS模式的系统参数设计流程,依据流程考虑了系统性能指标与成像可行性,对脉冲发射频率(Pulse Repetition Frequency,PRF)、子带个数、Burst时间和方位向子通道分布等关键参数进行设计,给出了多组设计参数,为后续的工程实现提供了参考。最后根据设计参数进行系统性能分析,证实了系统能够实现理想的成像效果,说明了设计结果的有效性。
At present,TOPS(Terrain Observation by Progressive Scans)mode of spaceborne SAR bears the important task of wide-swath observation.In this paper,combining with the technology of DPCMAB(Displaced Phase Center Multiple Azimuth Beams),TOPSAR can realize higher resolution and wider swath.Due to the periodic scanning in the range and azimuth directions,parameter design of system should consider the comprehensive effect and the result of multiple areas.A novel system parameter design process of multichannel TOPS mode is proposed in this paper.According to the process,key parameters such as PRF,number of bands,time of Burst and channel distribution are designed.The last part of this paper analyzes the system performance and proves that the system can achieve ideal imaging effect by using the designed results.
作者
陈粤
禹卫东
CHEN Yue;YU Weidong(Department of Space Microwave Remote Sensing System,Aerospace Information Research Institute,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《雷达科学与技术》
北大核心
2022年第2期142-149,156,共9页
Radar Science and Technology
