CAJ | 학술논문

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(=1/Tc的循环谱,给出了循环谱峰的检测公式.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.
전통검측확빈신호적성광기술,시장확빈신호건모위수궤평은과정,이확빈신호시피위수궤마조제적주기신호,응건모위순배평은수궤과정.기우성광기술여순배보상관기술,제출료확빈신호적성광보상관검측방법.건립료기우성광시간적분적성광보상관검측모형,분석료당간우묘준확빈접수궤시,확빈신호재순배빈솔(=1/Tc적순배보,급출료순배보봉적검측공식.방진실험결과표명,여전통적성광기술검측확빈신호적공솔보상비,재광전검측진렬상검측적순배보봉,보봉방판궤호위령,병가다획득약3dB적증익,표명성광보상관검측방법구유경우이적검측화항간우성능.
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.