摘要
双基星载高分辨率宽测绘带SAR系统(HRWS-SAR)利用数字波束形成技术(DBF)将俯仰向多通道的回波信号进行快时间域的相干合成,DBF处理性能必然受到双基构型的影响。该文针对一般双基构型的星载HRWSSAR系统,推导了点目标接收方向角与收发距离和之间的线性近似表达式,建立了俯仰向通道的回波信号模型,进而构建了一种时变加权与FIR滤波相结合的DBF处理方法,并给出了系统实现框图。该文对几种典型双基构型的星载HRWS-SAR系统DBF处理进行了仿真,结果表明合理的双基构型能有效提升星载HRWS-SAR系统的DBF处理性能。
In bistatic spaceborne High Resolution Wide Swath SAR （HRWS-SAR） system, the Digital Beam Forming （DBF） technique is employed to achieve the coherent combination of multi-channel signals in the fast time domain, and its performance is affected by the bistatic configuration. For a point target, the relationship between receiver aspect angle and the sum of transmitter distance and receiver distance is approximated by a linear function and the echo signal model in elevation channel is built. Further, a DBF processing scheme is proposed, which combines the time-variant weighting and Finite Impulse Response （FIR） filtering, and the implementation block diagram is presented. The DBF processing is simulated in several typical bistatic configuration spaceborne HRWS-SAR systems. Simulation results show that the higher DBF performance can be achieved in the spaceborne HRWS-SAR system with rational bistatic configuration.
出处
《电子与信息学报》
EI
CSCD
北大核心
2017年第10期2317-2324,共8页
Journal of Electronics & Information Technology
基金
安徽省自然科学基金(1508085MF119)~~
关键词
双基SAR
高分辨宽测绘带
数字波束形成
双基构型
Bistatic SAR
High Resolution Wide Swath （HRWS）
Digital Beam Forming （DBF）
Bistaticconfiguration
