天线-罩系统电气性能分析

天线罩在保护雷达天线不受环境影响的同时，又会对天线的电磁辐射产生某些干扰．使天线的电气性能降低．因此，需要对天线-罩系统的电气性能进行精确分析和仿真预测．在天线罩工程中应用较多的是射线跟踪(RT)法和平面波谱-表面积分(PWS-SI)法，通过对比分析发现PWS-SI技术在分析精度和运算速度上具有较突出的优点，同时具有精确处理天线-罩系统近场的灵活性．应用PWS-SI方法对某一类较小的天线-罩系统E-面上的远场和方向图(SP)、瞄准误差(BSE)和瞄准误差率(BSES)进行了数值分析和计算，并将仿真计算结果与实测值进行比较，发现两者具有良好的一致性，证明PWS-SI方法在预测这类天线-罩系统的电气性能上是准确有效的．

Analytical method of electrical performance of antenna-radome system

Radome is designed to protect the radar antennas from the external environment. However, radome is interfering with the electromagnetic radiation of radar antenna, which may result in significant performance degradation to radar antenna systems. Therefore, electrical performance of radome-enclosed antenna has to be precisely analyzed and artificially predicted. In practice, some methods widely used are compared in detail with other methods, such as the ray tracing (RT) method and the plane wave spectrum-surface integration (PWS-SI) method. It can be concluded by comparison that the PWS-SI method has more outstanding advantages in analysis accuracy and computation time than other methods. Meanwhile, it is flexible to handle the effect of radome wall precisely. Then, the PWS-SI method is applied to numerical analysis of far-field sum pattern, boresight error and boresight error slope of a smaller antenna-radome system. The calculation results coincide with the measured results. Therefore, the PWS-SI method is accurate and effective to analyze the electric performances of smaller antenna-radome system.