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为了实现对基于 FSK(频移键控 )调制方式的远动信道的监控 ,必须首先准确检测 FSK信号的载波频率。 FSK信号的频谱成分比较复杂 ,包含基带信号引入的连续谱和载波信号引入的离散谱两部分 ,传统的信号处理方法难以准确测量。针对以上特点 ,提出了一种新的非线性变换——时域拼接变换 ,通过对 FSK信号的分割和重新组合 ,消除了两个载波信号之间的相关性 ,抑制了基带信号对功率谱的影响 ,将离散谱从功率谱中分离 ,并结合现代功率谱估计方法 ,实现了对信号载波频率的高精度测量。计算机仿真与实验证明 ,该方法是一种有效的 FSK载波频率测量方法
In order to monitor the remote channel based on the FSK (Frequency Shift Keying) modulation method, the carrier frequency of the FSK signal must be accurately detected. The spectral components of the FSK signal are complex, including the continuous spectrum introduced by the baseband signal and the discrete spectrum introduced by the carrier signal. The traditional signal processing methods are difficult to accurately measure. In view of the above characteristics, a new non-linear transform-time-domain splicing transform is proposed. By splitting and recombining the FSK signals, the correlation between the two carrier signals is eliminated and the influence of the baseband signal on the power spectrum Influence, separate the discrete spectrum from the power spectrum, and combine the modern power spectrum estimation method to realize the high-precision measurement of the signal carrier frequency. Computer simulation and experiment show that this method is an effective FSK carrier frequency measurement method