为适应复杂时变、低信噪比的非协作卫星通信环境,提出了基于能量谱和双谱切片的双通道卫星通信信号快速盲检测方法.首先,计算信号的能量谱进行能量检测;然后,利用能量谱快速计算双谱切片实行双谱检测;最后,综合两类方法的检测结果.该方法同时利用了信号的二阶和三阶统计信息,增加了检测可利用的信息量,有利于检测性能的提高.仿真实验表明,在相同的低信噪比条件下,该方法的检测概率比单独用其中一种检测方法提高了约10%,而计算量相对于能量检测则基本没有增加,基本满足了非协作卫星通信的快速实时、低信噪比等要求.%Aiming at complex time-varying non-cooperative satellite communication environments with a lower Signal-to-noise Ratio(SNR),a double-channel blind detection algorithm of satellite communication signals based on an energy spectrum and a bispectrum slice is presented.Firstly,the power spectrum is calculated to detect the energy; then,the bispectrum slice is fastly computed by the power spectrum to implement bispectrum detection; finally,the two results are combined.By making use of the second and the third order statistics synchronously,the method increases available information and is favorable to improving the detection performance.Simulation results indicate that detection probability of the method is 10% higher than that of any of the above two in the same lower SNR conditions without adding computational complexity relative to that of energy detection.The presented algorithm can satisfy non-cooperative satellite communication requirements of high speeds,real-time and lower SNRs.
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