从合成孔径雷达(SAR)系统的工作原理出发,分析了SAR天线相位中心的实际含义和定位需求,总结出相位中心在天线口径面上最佳二维坐标和相对插入相移2项指标.利用几何光学原理和最小二乘估计,给出了2项指标的测量方法,并给出了一部双子孔径SAR相控阵天线的相位中心测量实例.
On the basis of the principle of SAR(synthetic aperture radar) system, significance of SAR antenna's phase center is analyzed and two parameters are summed up: LMS location of aperture-plane phase center and relative inserted phase shift. By using the GO(geometrical optics) principle and least square estimation, the measurement method for the two parameters is presented and verified by a two-aperture phased array antenna.
[1] IEEE Std 145-1993. IEEE standard definitions of terms for antennas[S]. March 18, 1993.
[2] Eugen I, Muehldorf. The phase center of horn antennas[J]. IEEE Transaction on Antenna Propagation, 1970, 18(6):753-760.
[3] Li R, Li J X. Study on phase center of narrow beam antenna[J]. Journal of Microwaves, 2010(8):103-105(in Chinese). 李锐,李建新. 窄波束天线的相位中心定位技术研究[J]. 微波学报, 2010(8):103-105.
[4] Chen X, Fu G, Gong S X, et al. Calculation and analysis of phase center on array antennas[J]. Chinese Journal of Radio Science, 2010, 25(2): 330-335(in Chinese). 陈曦,傅光,龚书喜,等. 阵列天线相位中心的计算与分析[J]. 电波科学学报, 2010, 25(2):330-335.
[5] Tang P, Li X, Wang J,et al. Calculation of phase center for the antenna with the method of moving reference point[J]. Chinese Journal of Radio Science, 2005, 20(6):725-728(in Chinese). 唐璞, 李欣, 王建, 等. 计算天线相位中心的移动参考点法[J]. 电波科学学报, 2005, 20(6):725-728.
[6] Wu C B, Yang W L, Liu B. The measurement of antenna phase center and time delay[J]. Space Electronic Technology, 2009,1:92-96(in Chinese). 吴春邦,杨文丽,刘波. 导航卫星天线相位中心及时延测试[J]. 空间电子技术, 2009,1:92-96.
[7] Skolnik M I. Introduction to radar systems[M]. 3ed. New York: McGraw-Hill, 2001.
[8] Shang J P, Fu D M, Deng Y B. Research on the accurate measurement method for the antenna phase center[J].Journal of Xidian University: Natural Sciene, 2008, 35(4):673-677(in Chinese). 尚军平,傅德民,邓颖波. 天线相位中心的精确测量方法研究[J]. 西安电子科技大学学报:自然科学版, 2008, 35(4):673-677.
[9] 毛乃宏,俱新德.天线测量手册[M].北京:国防工业出版社, 1987.
