空间低频射电天文天线材质-观测性能分析

Space low frequency radio astronomy antenna materials-observation performance analysis

15MHz以下的射电天文信号由于受到电离层的阻挡只能通过空间卫星平台进行观测。采用空间展开的电小天线是目前普遍的做法。就电小天线的材质-接收性能方面进行分析,构建了基于材质磁导率、电导率对后端接收机噪声影响模型。通过计算结果比对和就天线材质空间展开难易程度的综合考虑,归纳总结了不同材质对空间低频射电天文观测噪声影响以及展开难度,为新天线的研制提供了数据依据。该项工作将为下一步L1点空间天气监测卫星中的太阳射电观测载荷提供技术支持。

The radio astronomy signal can only be observed in space because of the ionospheres’barrier.Nowadays,it always uses the space deployable electric small antennas for observing.In this paper,we did some analysis for the material of electric small antennas and the corresponding receiving performance,and we constructed the noise influence model based on the material Permeability,electrical conductivity.Through the comparing the computing results based on above model,we conclude that the different influences and deploy difficulties based on different antenna materials,and provide the data reference for new antenna designing.This work can provide the technology supports for the solar radio observation payload located in the next L1 point space monitoring satellite.