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提出了用声光相关器实现宽带微弱扩频信号解调解扩的方法 ,建立了把声光布拉格相关器和光电检测器视为一体的数学模型 ,推出了两种衍射光检测法动态范围的表达式 .用计算机仿真和实验研究激光高斯分布、窗口函数和超声吸收等因素对相关峰峰值和主旁瓣比的影响 .最后进行了扩频信号声光相关解调解扩的原理实验 ,实验结果与理论分析基本吻合 ,验证了声光解调解扩的方法 .
A method to demodulate and de-spread wide-band weakly spread spectrum signals by using the acousto-optic correlator is proposed. The mathematical model of integrating the acousto-optic Bragg correlator and the photodetector is established, and the expressions of the dynamic range of the two diffracted light detection methods are introduced The effects of laser Gaussian distribution, window function and ultrasonic absorption on the peak-to-peak ratio and main sidelobe ratio of laser are studied by computer simulation and experiment.Finally, the principle experiment of the demodulation and expansion of the spread spectrum signal is carried out. The experimental results and The theoretical analysis is basically consistent, verifying the method of demodulating and expanding the sound and light.