多项式拟合技术在天线增益测量中的应用研究

Applications of polynomial fitting technique in antenna gain measurement

文中简述了多项式拟合的基本原理公式,提出利用多项式拟合技术确定天线增益频段特性和大型口径天线不同仰角增益的方法。在比较法增益测量中,标准喇叭的增益常为已知的离散校准值,利用高频、低频和两个中间频点的增益值拟合了标准喇叭增益的解析式,非拟合点的增益计算结果同已知的标准喇叭增益校准值吻合很好,证明了该方法的有效性。最后,简述了多项式拟合技术在S波段8.54 m气象雷达天线增益测量及大型射电望远镜天线不同仰角增益测量中的应用。

In this paper,basic principle formula of polynomial fitting is described briefly.The polynomial fitting technique is used to determine the frequency band characteristics of antenna gain and the gain at different elevation angles of large aperture antenna.In the comparative method of antenna gain measurement,the gain of the standard horn is usually known for discrete calibration values,and the analytical formula of standard horn gain are fitted with gains of high frequency,low frequency and two middle frequency points.The gain calculation results of non-fitting frequency points are agree well with known calibration values of standard horn gain,which verifies the validity of the proposed method.At last,the application of polynomial fitting technique in antenna gain measurement of S-band 8.54-meter weather radar and antenna gain measurement of large radio telescope at different elevation angles is described briefly.