基于密度锥削阵sin-FDA的波束方向图研究

Research on beam control of density taper array sin⁃FDA based on subarray structure

频率分集阵列(Frequency Diverse Array, FDA)是作为一种全新的电扫描雷达体制,其方向图所具有的时间-距离-角度三维相关特性在电子对抗和安全通信等领域有广阔的应用前景。一维均匀线性FDA阵列(Uniform Linear Array Frequency Diverse Array, ULFDA)的发射方向图存在角度-距离耦合问题,针对这一问题,在对称子阵密度锥削阵结构的基础上,通过正弦频控函数取代原有的均匀线性函数,得到了FDA的点状波束指向控制方法。此外,针对FDA方向图的时变问题,得到了基于子阵结构的密度锥削阵sin-FDA主波束在角度维指向固定、距离维变化时的结论。

Frequency Diverse Array(FDA)is a brandnew electronically scanned radar system.The timerangeangle threedimensional correlation characteristics of its beampattern have broad application prospects in the fields of electronic countermeasures and security communications.Onedimensional uniform linear FDA array(ULFDA)has the problem of anglerange coupling in the transmit beampattern.To solve this problem,this paper adopts sine based on the symmetrical subarray density taper array structure.The frequency offset obtains the dotshaped beampattern pointing control method at the target point position.In addition,we analyze the timevarying problem of the FDA pattern,and get the conclusion that the mainlobe of the density tapered array sinFDA based on the subarray structure has a fixed direction in the angle dimension and changes in the range dimension.