基于修正最小二乘的虚拟端射阵列回波算法研究

Research on Echo Algorithm of Virtual End-Fire Antenna Array Based on Modified Least Squares

在端射天线组阵巾,期望获得高增益低副瓣的组阵效果.但由于端射天线单元间的复杂互耦,小间距组阵时副瓣电平抬高得不到预期增益的提高,通过拉大单元间距可以抑制互耦、获得高增益,但又导致出现栅瓣电平.因此针对10振子平板端射天线单元大间距组阵并侧向内插虚拟阵元的情况,提出一种修正最小二乘估计回波算法,以此计算虚拟阵元的回波信号,并与实际阵列回波信号同相叠加米达到抑制栅瓣的目的.对比分析了虚拟端射天线阵列通过传统最小二乘估计和修正最小二乘估计计算所得的方向图,结果证明后者有效抑制了栅瓣并获得了更低的副瓣电平.

Since the complex coupling between end-fire antenna elements,high side lobe level is produced without high gain when the space of the end-fire antenna array is less than 1 .5λ.In order to restrain the coupling,the space of the array should be in-creased but the grating lobe is produced concurrently.For this reason,taking the 10 -monopole plate end-fire antenna as the array element arranged with large spacing and virtual elements interpolated,an echo algorithm of virtual end-fire antenna array based on modified least squares estimation was put forward.Using this algorithm,the echo signals of virtual elements were obtained in order to restrain the grating lobe.And then,the far field patterns of the virtual end-fire antenna array were compared and analysed between results calculated by traditional least squares and modified least squares.With this understanding,it can be proved that the new algo-rithm has superiority over the traditional one and the validity in grating lobe restraining and side lobe reduction can be confirmed.