船载C+S频段共面单脉冲天线设计与应用

Design and Application of Ship-borne C/S Monopulse Antenna 

摘要:

航天测量船在执行海上测控任务时,主要跟踪目标为C频段和S频段的航天器。受甲板面积限制,测量船无法在甲板上安装多套不同频段的天线,设计C＋S双频段共用天馈系统就显得尤为必要；在C+S频段天馈系统的硬件选择上,C频段初级辐射器采用单喇叭方式,利用TE01模、TE21模、TM01模3个差模对目标实施跟踪；S频段初级辐射器采用四喇叭方式,利用四喇叭的信号合成对目标实施跟踪；设计C+S双频段天馈系统时采用计算机辅助技术,确定了天线反射面和馈源喇叭的形式及相对关系尺寸;并通过仿真计算出天馈系统的增益、副瓣电平、差波瓣零深、差斜率等方向图关键指标均满足设计要求,达到了双频段天线的小型化和合建的目的,满足航天测量船船载设备的使用要求。

Abstract:

The main tracking targets are C-and S-band spacecrafts when TT&C ships carry out maritime tracking and control task. Due to the limited space on board, several sets of different bands antenna can’t be installed wholly on the ship board. So it is necessary for the C-and S-band antennas sharing the same feed system. For the C-and S-band antenna feed system, the C-band primary radiator adopts a single horn, which products a differential mode consisted of TE01 mode, TE21 mode and TM01 mode; the S-band primary radiator four horns with the differential mode signal consisted of the signals producted by all horns. With computer-aided design, the geometries and sizes of the reflector and horn were determined. Simulation and measurement results show that the radiation patterns and the gain in dual bands can satisfy the specifications. Its compactness and miniaturization facilitate TT&C ships.