| 宽带微弱扩频信号声光相关解调解扩方法 |
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| 引用本文： | 斯德谊,刘荣科,李暑坚,邵定蓉. 宽带微弱扩频信号声光相关解调解扩方法[J]. 电子学报, 2000, 28(4): 46-48 |
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| 作者姓名： | 斯德谊 刘荣科 李暑坚 邵定蓉 |
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| 作者单位： | 北京航空航天大学电子工程系,北京,100083 |
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| 基金项目： | 航空科学基金!(No .96F51 0 71 ) |
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| 摘 要： | 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.
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| 关 键 词： | 声光相关器 扩频通信 解调解扩 衍射 |
A Method of a Wide-band and Weak Spread Spectrum Signal Demodulation Using Acousto-optic Correlators |
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| SI De-yi,LIU Rong-ke,LI Shu-jian,SHAO Ding-rong. A Method of a Wide-band and Weak Spread Spectrum Signal Demodulation Using Acousto-optic Correlators[J]. Acta Electronica Sinica, 2000, 28(4): 46-48 |
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| Authors: | SI De-yi LIU Rong-ke LI Shu-jian SHAO Ding-rong |
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| Affiliation: | Dept.of Electronic Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China |
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| Abstract: | A method of correlative demodulation of a wide band and weak spread spectrum signal is proposed using an acousto optic correlator.A mathematical model of the acousto optic correlator and photodetector is given,then the dynamic range of two kinds of diffraction light detection methods are derived.The effect of the Gaussian distribution of laser amplitude,laser window's function and the acoustic attenuation of medium on correlative peak and the main peak to side lobe is obtained by computer simulation and experiments.The principle experiment of acousto optic correlative demodulation of the spread spectrum signal is done.The results of experiments are basically consistent with the theoretical analysis.The capabilities of the method are demonstrated. |
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| Keywords: | acousto optic correlators spread spectrum communication demodulation diffraction |
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