相控阵子阵级和差多波束测角方法

针对大型相控阵多目标单脉冲测角问题,提出了一种利用和差多波束在子阵级实现多目标测向的方法.首先,通过合并阵元输出降低系统复杂度;其次,通过多套子阵级仅相位导向矢量和对称取反方式实现和差多波束;最后,只需获得方位及俯仰维法线斜率,就可估计任意指向波束内的目标二维偏角.与子阵级四指向和差测角方法相比,所提方法具有测角精度高和实现简单的优点.实测和仿真数据处理结果显示了方法的有效性和优越性.

Monopulse angle estimation using sum-difference multi-beamforming based on the phased array at the sub-array level

For the problem of monopulse angle estimations of multiple targets based on the large phased array, a method for estimating bias angles using sum-difference multi-beamforming at the sub-array level is proposed. Firstly, system complexity is reduced by combining the outputs of sensors; secondly, sum-difference multiple beamformings are achieved by phased-alone sub-array steering vectors with the anti-symmetric mode; finally, the 2-dimensional bias angles of targets in arbitrary steering beams are estimated based on the two slopes along azimuth and elevation axes pointing to the normal. Compared with the method of four steering sum-difference beamforming, the proposed method has the advantages of higher accuracy and lower complexity. The measured and simulated data show the effectiveness and superiority of the proposed method.