一种全数字滤波器的共形阵宽带阵列波束合成方法

A Wideband Digital Array Beamforming Method of Conformal Array Antenna Based on Digital Filters

在宽带信号波束形成中,传统的波束形成方法会导致天线波束指向偏移和主瓣展宽,因此需要使用时延补偿单元。针对共形阵宽带波束形成中低运算量、高延迟精度的要求,本文提出把实时延迟划分成整数部分和分数部分,采用低阶FIR滤波器和高阶FIR滤波器级联的数字波束形成装置。仿真结果表明,本文提出的方法有效地解决了宽带信号波束图指向偏移、主瓣展宽的问题。

In wideband signal beamforming, the traditional phase-shift method causes pattern pointing dev-iation and sidelobe widening, so the true time delay should be used to compensate the cannel delay accurately. In connection with low computation and high time delay precision of the wideband digital array beamforming, this paper proposed a digital beamforming system with high-order and low-order filter cascades. The simulation result indicates that the method proposed in this paper can solve effectively the pattern pointing deviation and sidelobe widening problems.