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概述单脉冲卡塞格伦天线一馈线系统影响次级差方向图零点偏移与零值深度的各种因素。提出了将馈源两单元支路的振幅与相位不平衡影响从诸因素中分离出来,确定其不平衡程度的方法;文中所提出的一种关于馈源倾斜影响单脉冲天线性能的计算方法,可以说明影响机理,且结果简化;而关于卡塞格伦天线各部件偏移的等效分析,可用以简化当馈源或付反射器存在横向与纵向偏移时的次级方向图性能计算。全部结果均为适宜于工程估算的简单公式。最后简述卡塞格伦天线各部件偏移影响的比较准确的计算。由所计算的结果可以得出结论:哪一些因素影响是重大的,应予特别注意。由分析得知各因素影响结果之间的关系,因而可以通过整个系统的精心调整来提高总的测角精度。
Summarize the various factors that affect the zero offset and the zero depth of the subplot pattern of a single pulse Cassegrain antenna-feeder system. A method of separating the influence of unbalanced amplitude and phase of two branches of feeder from each factor and determining the degree of unbalance is proposed. A calculation method of the effect of feed tilt on single-pulse antenna is proposed in this paper. The mechanism of influence can be explained and the result simplified. The equivalent analysis of the components’ displacement of the Cassegrain antenna can be used to simplify the calculation of the secondary pattern performance when the feed or the reflector has lateral and longitudinal deviations. All results are simple formulas suitable for engineering estimation. Finally, a brief account of the Cassettean antenna offset the impact of more accurate calculation. From the calculated results, it can be concluded that which factors are significant and should be given special attention. From the analysis that the various factors affect the relationship between the results, and thus can be adjusted through the entire system to improve the overall angle accuracy.