频域宽带波束形成器优化设计

将常规频域宽带波束形成运用到电子战侦察系统存在一个问题：分块DFT处理会造成时域输出波形在块衔接处产生周期性失真,影响系统对信号时域参数的检测。为解决上述问题,在分析失真产生原因的基础上提出采用交叠DFT处理对传统方案予以改进,该方法首先对预处理数据进行交叠分段,再完成DFT运算及后续窄带处理。最后的仿真通过对比改进前后方案时域输出波形的保真度,验证改进后方法能有效缓解时域输出波形失真对系统的影响,并为工程实现提供了依据。

Design of frequency-domain broadband beamformer optimization

There exists a problem in the application of the conventional frequency-domain broadband beamforming in electronic warfare reconnaissance systems: the periodic distortion of time-domain output waveform occurs in block cohesion due to block DFT processing,which has an impact on signal time-domain parameters detection.To solve the above-mentioned problem,the overlapped DFT method is adopted for the improvement of the conventional scheme based on the analysis of the causes of the distortion in this paper.The proposed method is to carry out overlapped subsection for the pretreatment data,and then perform DFT operation and narrow-band processing.Finally,the simulation results are given to compare fidelity of time-domain output waveform produced by two methods.The results indicate that the improved scheme minimizes time-domain output waveform distortion effectively and provides the basis for the engineering application.