摘要
针对反射面天线存在的误差问题,建立了包含系统误差和随机误差对电性能影响的数学模型.该模型根据表面误差与口径面相位分布的关系,利用口径法得到功率方向图.通过对模型分析可知,随机误差对方向图各个方位产生影响;系统误差产生栅瓣,且栅瓣的位置和电平取决于变形情况.最后将模型应用到8米口径的抛物面天线中,收到了满意的结果,验证了文中模型和方法的正确性.
To study the effect of the surface errors on reflector antenna performance, a computational model including systematic distortions and random errors was presented.In the model,power pattern was given by the aperture-field method according to the relation between surface errors and the phasedistribution of aperture plane. Then power patterns were simulated and it is shown that random en-ors work in every azimuth angles and systematic distortions generate grating lobes in a few angles, the location and level of grating lobes depend on the systematic distortions. Finally, the model was applied to a practical antenna with the diameter of 8 meters,the results show that the proposed model is valid.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2009年第3期552-556,共5页
Acta Electronica Sinica
基金
国家重点基础研究发展规划(973计划)项目(No.61358)
关键词
反射面天线
表面误差
系统误差
随机误差
电性能
reflector antenna
surface errors
systematic distortions
random errors
performance
