基于全通型分数时延滤波器的数字阵列宽带波束形成  

Digital Array Wideband Beam Forming Based on Fractional Time Delay All-pass Filter

作　　者：陈舒敏[1] 栾铸征[1] 林晨[1] 

机构地区：[1]船舶重工集团公司723所,扬州225001

出　　处：《舰船电子对抗》2013年第2期39-43,共5页Shipboard Electronic Countermeasure

摘　　要：对于宽带数字阵列雷达,由于孔径效应和孔径渡越时间影响,传统的窄带波束形成方法会导致天线波束指向不准和主瓣展宽,为此需要使用时延补偿单元取代传统窄带相控阵中的移相单元。为实现宽带数字阵列各阵元传输时延的精确补偿,可以引入分数时延滤波器。采用最小二乘法设计全通型分数时延滤波器,与群延迟最大平坦法相比较,该法灵活性更高,通过MATLAB仿真进一步验证了所设计滤波器的有效性和正确性。For wideband digital array radar, the traditional narrowband beam forming method may cause pattern pointing deviation of antenna beam and mainlobe widening because of aperture effect and aperture transit time influence, so the time delay compensation unit should be used to replace the phase shift unit of traditional narrowband phased array. In order to realize the accurate compen- sation of transmission time delay of each array element in wideband digital array, the fractional time delay filter is introduced. This paper adopts least squares approximation method to design fractional time delay all-pass filter, compared with the maximally flat group delay method, the method adopt- ed in this paper has better flexibility, the validity and correctness of the designed filter are validated further through MATLAB simulation.

关 键 词：分数时延滤波器 宽带数字波束形成 全通型滤波器 

分 类 号：TN958.92[电子电信—信号与信息处理]