分数延时滤波器设计与研究

Design and Study of Fractional Delay Filter

面对日益复杂的战争环境和电磁环境,干扰机需要在同一时刻干扰多个目标,数字同时多波束技术能够有效地解决这一问题。分数延时滤波器是实现数字多波束网络的核心技术,用数字延时的方法代替传统移相方法,能够有效地解决方向图扫描不准和主瓣展宽等问题。推导了数字波束形成结构,而且通过窗函数法、复频响应法和可变参数的Farrow结构法去设计分数延时滤波器,并对它们的性能进行了分析比较。

Facing increasingly complex war environment and electromagnetic environment,the jammer needs to jam multi-target at the same time,and the digital simultaneous multi-beam technology can effectively solve the problem.The fractional delay filter plays an important role in digital multi-beam net,which uses digital delay method to replace traditional phase shifting method,and can solve the problems such as inaccurate pattern scanning,main lobe expansion effectively,etc..This paper educes the structure of digital beamforming,and designs fractional delay filters by window function method,complex frequency response method and Farrow structure method with changeable parameters,analyzes and compares their performance.