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文中在分析延时相乘检测法检测JTIDS信号的基础上,得出该方法可以在检测到信号的两倍载频后,利用MSK的调制特性,可以检测到JTIDS信号的扩频码元带宽,但在信噪比较低时,检测性能明显下降。因此提出延时相乘-相关检测法,利用信号参数的固定性和信号与噪声、噪声与噪声之间不相关的特性,在计算功率谱之前将信号分段,作相关处理后在相关域累加,加强表示信号参数的峰线,相对降低噪声功率谱,从而在低信噪比下得到信号的载频信息。仿真实验表明:此时改进的延时相乘检测法的检测性能至少提高了5dB。因而延时相乘-分段相关检测法能够在更低的信噪比下实现对JTIDS信号的有效检测。
Based on the analysis of JTIDS signal detected by delay multiplication detection, it is found that this method can detect the spread spectrum symbol bandwidth of JTIDS signal by using the modulation characteristics of MSK after twice carrier frequency is detected. However, when the signal-to-noise ratio is low, the detection performance obviously drops. Therefore, the delay multiplication-correlation detection method is proposed. By using the fixedness of signal parameters and the irrelevant characteristics between signal and noise, noise and noise, the signal is segmented before the power spectrum is calculated and correlated in the related fields , To strengthen the signal line peak, relative to reduce the noise power spectrum, which can be obtained under low signal to noise ratio signal carrier information. Simulation results show that the detection performance of the improved delay multiplication detection method is improved by at least 5dB at this time. Therefore, delay multiplication - segment correlation detection method can achieve effective detection of JTIDS signals at lower signal-to-noise ratio.