星载宽带跨频段微波光子射频通道实现技术研究

Research on Realization Technology of Satellite Broadband Cross-Band Microwave Photonic Radio Frequency Channel

目前基于微波技术的射频通道带宽与频率受限、多频率变频能力受限、通用性差,严重制约了高通量卫星的频谱覆盖范围和大带宽多路变频能力.针对这一问题,本文在对微波光子射频通道研究现状对比分析的基础上,提出基于并联型架构的宽带跨频段微波光子射频通道实现方法,开展了相应的仿真分析及实验验证.测试结果表明:该射频通道下变频输入频率可覆盖27 GHz~52 GHz,输出频率可覆盖17 GHz~24 GHz;上变频输入频率可覆盖25 GHz~27 GHz,输出频率可覆盖37 GHz~43 GHz,且该射频通道工作带宽优于2 GHz,带内平坦度优于3 d B,变频增益优于-10 d B,无杂散动态范围优于100 d B·Hz.

At present,the RF(Radio Frequency)channel based on microwave technology features limited bandwidth,limited working frequency,limited multi-frequency conversion capability and poor versatility,which seriously prevent the high-throughput satellites from the large spectrum coverage and the multi-channel conversion capability of large bandwidth.To solve this problem,based on the comparative analysis of the research status of microwave photonic RF channel,this paper proposes a broadband cross-band microwave photonic RF channel implementation method based on parallel architecture,and the corresponding simulation analysis and experimental verification are carried out.The test results show that the down conversion input frequency of the RF channel can cover27GHz~52GHz,and the output frequency can cover17GHz~24GHz;the up conversion input frequency can cover25GHz~27GHz,and the output frequency can cover37GHz~43GHz.The bandwidth is larger than2GHz,the in-band flatness is lower than3d B,the conversion gain is lower than-10d B,and the spurious free dynamic range(SFDR)is higher than100d B?Hz.