星载抛物面天线视在相位中心确定方法及应用

星载抛物面天线成像过程中对波束的指向精度有较高要求,而波束指向精度在很大程度上取决于天线相位中心的位置精度。基于抛物面天线工作原理及视在相位中心的定义,提出一种抛物面天线视在相位中心的确定方法。在此基础上,通过卫星在轨多体系统仿真分析,给出了卫星机动过程中的视在相位中心坐标范围,并利用最小二乘法分析了视在相位中心坐标偏移量。进一步对比分析了有阻尼器和无阻尼器连接方式对天线视在相位中心偏移量的影响关系,为后续抛物面天线指向精度研究提供了理论基础。

A Method of Determining Phase Centers and Its Application to Parabolic Antenna

The accuracy requirement of beam pointing is high in imaging process of spaceborne parabolic antenna, and the accuracy of beam pointing depends largely on the positional accuracy of antenna phase center. Based on the working principle of parabolic antenna and the definition of apparent phase center, this paper proposes a method for determining the apparent phase center of a parabolic antenna. On this basis, through the satellite on-orbit multi-body system simulation analysis, the apparent phase center coordinate range of the satellite maneuvering process is given, and the apparent phase center coordinate offset is analyzed by the least squares method. Furthermore, the influence of the connection modes with and without dampers on the phase offset of the antenna is compared and analyzed, which provides a theoretical basis for the subsequent study of the pointing accuracy of the parabolic antenna.