基于子阵结构的大孔径相控阵天线设计

在卫星通信和飞行器测控中,大孔径相控阵天线结构上采用前端模拟子阵和阵间数字波束形成相结合的方式,可以克服天线面临的时间色散问题。子阵规模通过成本和子阵色散确定,阵间波束形成采用空时二维延时滤波器结构,滤波器系数采用查找表方式获得,便于工程实现。计算机仿真验证了系统结构、子阵划分、延时滤波器设计的正确性。

Large Aperture Phased Array Antenna Design Based on Sub-array Structure

In the satellite communication and space vehicle TT&C, a new methodology for large aperture phased array antenna design is proposed to solve the problem of time dispersive, where the analog sub-array is integrated with digital beamforming. The size of sub-array is decided by array cost and time dispersive of sub-array. And the beamforming is realized through time delay filter in digital domain. Furthermore, the filter coefficients could be obtained by looking up table so that it is implemented easily. Finally, some computer simulations prove that these proposed design methodologies for system structure, sub-array schedule and time delay filter are correct.