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多频段多路信号同步调制时,星间微波光子链路性能与单路信号调制时相比有很大不同。基于Ku和Ka频段4路信号同步调制的星间微波光子链路模型,实现了卫星接收射频信号在光域上的放大、传输和分束等处理,利用贝塞尔函数展开分析了输出端非线性失真分量,推导了单边带、双边带和推挽调制方式下输出信号失真比(SDR)和信号噪声失真比(SNDR)。结果表明,非线性失真对单边带调制的影响小于双边带调制;单边带和双边带调制时最优输出SNDR值相同,对应的双边带调制时调制系数小于单边带调制;推挽调制方式时低偏置相位不能优化输出SNDR值。综合考虑输出信号质量和功耗因素,多频段信号同步调制时星间微波光子链路应选取双边带调制方式。
Multi-band multi-channel signal synchronization modulation, inter-satellite microwave photonic link performance and single-channel signal modulation is very different. Based on the inter-microwave microwave photonic chain model of 4-channel Ku- and Ka-band synchronous modulation, the amplification, transmission and splitting of the satellite receiving RF signal in the optical domain are realized. The output of the output is analyzed by Bessel function Linear distortion components, the output signal distortion ratio (SDR) and signal noise distortion ratio (SNDR) for single-sideband, double-sideband and push-pull modulation are derived. The results show that the nonlinear distortion has less influence on single sideband modulation than double sideband modulation. The optimal output SNR is the same for single sideband and double sideband modulation, and the corresponding double sideband modulation is less modulation than single sideband modulation. Push-pull modulation Mode Low Bias phase can not optimize output SNDR value. Considering the output signal quality and power consumption factors, the multi-band signal synchronization modulation should be selected between the two-band microwave modulation mode.