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传统检测扩频信号的声光技术,是将扩频信号建模为随机平稳过程,而扩频信号是被伪随机码调制的周期信号,应建模为循环平稳随机过程。基于声光技术与循环谱相关技术,提出了扩频信号的声光谱相关检测方法。建立了基于声光时间积分的声光谱相关检测模型,分析了当干扰瞄准扩频接收机时,扩频信号在循环频率α=1/Tc的循环谱,给出了循环谱峰的检测公式TcRs1/。仿真实验结果表明,与传统的声光技术检测扩频信号的功率谱相比,在光电检测阵列上检测的循环谱峰,谱峰旁瓣几乎为零,并可多获得约3dB的增益,表明声光谱相关检测方法具有更优异的检测和抗干扰性能。
The traditional acousto-optic technology for detecting spread spectrum signals is to model the spread spectrum signal as a stochastic stationary process, while the spread spectrum signal is a periodic signal modulated by a pseudo-random code and should be modeled as a cyclostationary stochastic process. Based on the related technologies of acousto-optic technology and cyclic spectrum, the detection method of the correlation of the spectrum of the spread-spectrum signal is proposed. The acoustic spectrum correlation detection model based on the acousto-optic time integral is established. The cyclic spectrum of the spread spectrum signal at the cyclic frequency α = 1 / Tc is analyzed when the interference is aimed at the spread spectrum receiver. The detection formula TcRs1 /. The simulation results show that compared with the traditional acousto-optic technique to detect the power spectrum of the spread spectrum signal, the cyclic peaks detected on the photodetection array have almost zero sidelobes and can gain about 3dB gain, indicating that Acoustic and spectral correlation detection method has more excellent detection and anti-jamming performance.