摘要
研究了一种利用近场测量技术全息成像相控阵天线口径幅相的方法。该方法是把近场测量获得的方向图函数与由单元形式及幅相分布表示的方向图函数进行比较 ,采用 FFT算法和空间域的 Fourier重构法 ,可以快速、精确地成像出相控阵天线口径的“全息图”,进而诊断出阵中单元幅相的奇异程度。通过仿真实验 ,检验了该方法的成像分辨率和精度 ,并考察了不同口径区域的成像误差对辐射方向图的影响程度 。
A holographic technique is investigated for amplitude and phase distributions in the aperture of a phased array antenna by using near field measurements. The pattern functions obtained by near field measurements are compared with ones expressed in terms of elements and their amplitude and phase distributions. Then, both FFT and Fourier reconstruction are utilized to take the hologram of the phased array quickly and accurately, and consequently to diagnose the element to the extent of significant variation in amplitude and phase. By simulation, a demonstration of holographic resolution and precision is given and the effect of holographic errors in the different aperture areas on radiation patterns examined, which also shows its good prospects for practice.
出处
《电波科学学报》
EI
CSCD
2001年第4期421-432,共12页
Chinese Journal of Radio Science
基金
国家重点实验室基金课题资助项目 (99JS0 7.3.1)
