宽带阵列雷达发射波束形成方法

Transmitting Beam Forming Method for Wideband Array Radar

针对目前宽带阵列雷达普遍面临的由孔径渡越带来的波束指向漂移和主瓣宽度抖动的问题,以线性调频信号作为发射信号,从信号基础理论和阵列处理技术出发推导了波束指向漂移和波束宽度抖动的成因,并分析了它们在不同相对带宽下对雷达波束指向和波束宽度的影响程度。根据理论分析,提出了阵元载频微调和时域重采样法相结合的宽带波束形成方法。理论分析与仿真结果表明,宽带阵列雷达波束可以在一个脉冲持续时间内保持波束指向和主瓣宽度的稳定;同时,该方法具有结构简单、运算量小、速度快的特点,可应用于实时雷达系统并便于工程实现。

Aiming at the general problems of wideband array radar,i.e.,beam pointing drift and main lobe width jitter caused by aperture fill,we deduced the causes through basic signal theory and array processing technology by using chirp signal as the transmitted signal,and analyzed their influence on beam-pointing and beam-width of the radars under different relative bandwidth.According to the theoretical analysis,a stable method for wideband beam forming was proposed,combining fine adjusting technique of array element carrier frequency with time-domain resambling.Theoretical analysis and simulation results demonstrate that with this method,the beam pointing and the main lobe width of the beam of wideband array radars can keep stable within a pulse duration.Meanwhile,with characteristics of simple structure,small calculating amount and fast speed,the method is applicable to real-time systems and convenient for engineering implementation.