摘要
对基于快速傅里叶变换(fast Fourier transform,FFT)的宽带多波束快速运算结构的基本原理进行了详细推导:首先分析指出了该结构存在子带间波束指向偏差以及子带波束"溢出"问题,进而导致其有效带宽受限;然后通过数学推导将问题聚焦于阵元个数与FFT点数的绑定关系上;最后通过采取"补零"手段解除该绑定关系,从而在消除子带波束指向偏差的同时克服了"溢出"现象对有效带宽的限制。该方法及相关结论对FFT宽带多波束形成算法在工程中的进一步应用起到了积极的推动作用。
This paper firstly analyzes the fundamental structure of the FFT broad-band multi- beam forming, and points out the subband beam direction difference and beam ＂overload＂ problem of this structure, which causes the limitation of the valid bandwidth. By mathematic deriving, the fun- damental cause of the problem is found to be the binding of element number and FFT length, and the additional zeros are used to release this binding, as the results of which, the subband beam direction difference eliminated and bandwidth limitation caused by the ＂overload＂ problem is broke through. The proposed method and research results are very helpful for the engineering application of the FFT broad-band mihi-beam forming.
出处
《装备学院学报》
2014年第6期84-89,共6页
Journal of Equipment Academy
关键词
数字阵列雷达
宽带多波束形成
频率响应
波束响应
digital array radar
broad-band multi-beam forming
frequency response
beamresponse
