Ka频段35.5-36 GHz低轨SAR卫星对地面雷达的干扰特性分析

Interference Characterization of Ground Radar by Low-Orbit SAR Satellites at 35.5-36 GHz in Ka Band

针对使用Ka频段的合成孔径雷达(Synthetic Aperture Radar,SAR)的近地轨道(LEO)卫星对我国地面雷达系统的潜在干扰问题开展研究,在梳理国际电信联盟技术建议书和《无线电规则》的基础上,通过理论分析和干扰仿真等手段,对特定搭载SAR载荷的低轨卫星在完整周期内对地面气象雷达的干扰问题进行分析计算。研究结果表明,在SAR卫星与地面气象雷达有重叠部分的频段,考虑雷达部署特性和卫星轨道特性,卫星对地面气象雷达不会产生严重干扰。分析过程和结果对类似场景的星地频率兼容分析提供参考,对Ka频段雷达和SAR的工程预研和应用具有指导意义。

Research has been carried out on the potential interference of low-Earth orbit(LEO)satellites using Ka-band Synthetic Aperture Radar(SAR)with China's terrestrial radar system.On the basis of sorting out the International Telecommunication Union’s recommendations and Radio Regulations,the interference problem of a specific SAR-carrying LEO satellite on the ground-based meteorological radar during a complete cycle is analyzed and calculated by means of theoretical analysis and interference simulation.The results of the study show that in the frequency bands where there is an overlap between SAR satellites and ground-based meteorological radars,the satellites will not cause serious interference to radars,taking into account the deployment characteristics of the radars and the orbit characteristics of the satellites.The analytical process and results provide reference for satellite-terrestrial frequency compatibility analysis of similar scenarios and are of guiding significance for the engineering pre-study and application of Ka-band radar and SAR.