双基星载HRWS-SAR系统俯仰向DBF处理技术

发布时间：2018-04-14 23:08

  本文选题：双基SAR + 高分辨宽测绘带　； 参考：《电子与信息学报》2017年10期

【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。
[Abstract]:The performance of coherent synthesis of pitching multi-channel echo signals in fast time domain is bound to be affected by bistatic configuration by using digital beamforming (DBF) in a bistatic high resolution wide mapping band SAR system (HRWS-SAR).In this paper, the linear approximate expression between the receiving direction angle and the sum of the receiving distance of the point target is derived for the spaceborne HRWSSAR system with a general bistatic configuration, and the echo signal model of the pitching channel is established.Furthermore, a DBF processing method combining time-varying weighting with FIR filter is constructed, and the block diagram of the system is given.In this paper, several typical bistatic configurations of spaceborne HRWS-SAR system DBF processing are simulated. The results show that the reasonable bistatic configuration can effectively improve the DBF processing performance of spaceborne HRWS-SAR system.
【作者单位】： 合肥电子工程学院;
【基金】：安徽省自然科学基金(1508085MF119)~~
【分类号】：TN957.51
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本文编号：1751421