对于精密跟踪测量雷达,系统的威力和跟踪精度是天线设计时考虑的两个重点。在天线设计中,威力主要由天线的 和增益保证,而精度主要是由雷达天线的归一化差斜率保证,即天线归一化差斜率是影响精密跟踪测量雷达测角精度的 重要因素。文中着重阐述了差斜率的定义以及差斜率对系统精度的影响进行了分析;然后结合实际情况,分析了五喇叭 馈源差斜率对系统精度的影响情况,最后提出了馈源优化的措施,并且检验了馈源优化后的系统角度随机误差,满足雷达 设计要求。

For precision tracking radar ,system power and precision are two key parameters for the antenna design. In the antenna design, system power is mainly supported by the antenna sum gain, and measurement precision of radar antenna is supported by normalized difference slope, whereby the antenna normalized difference slope is the important factor affecting accuracy of angular measurement of radar. The difference slope definition and difference slope influence on system accuracy is elaborated emphatically in this article. Then, combining with the actual situation of radar, influence of five horn feed difference slope on system accuracy is analysed. Last, measures to optimize the feed are proposed, and system random error of radar angle which is optimized is tested and it can meet the design requirements.