扩频信号的声光谱相关检测

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。

Acousto-optic spectral correlation detection for SS signals

s:Acousto-optic (AO) techniques for detecting traditional Spread Spectrum (SS) signals, assume SS signals to be stationary, while SS signal, a cyclic signal modulated by pseudo noise code, should be modeled as Cyclic Stationary (CS) signal. Based on AO technique and cyclic spectral correlation technique, the method of AO spectral correlation detection is proposed. A detection model for AO spectral correlation based on AO time-integrated is established. The cyclic spectrum of SS signal is analyzed when interference happens to SS receiver, and spectrum apex of cyclic spectrum is presented. Simulation results show that, Compared with traditional AO technique in detecting the power spectrum of SS signals, the detection of cyclic spectrum will gain more about 3dB in photodetector array, and the sidelobe of spectrum apex is almost zero, which shows that the AO spectral correlation detection is of better performances for detection and anti-interference.