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基于光纤马赫-曾德尔(M-Z)干涉技术对周界防范系统进行了研究设计。采用改进的双光纤M-Z干涉相位检测技术与互相关算法相结合的方案进行信号提取。详细介绍了互相关算法在系统定位方面的应用,并通过实验证实其可行性。对两路经过不同延时的相同信号进行互相关运算,通过峰值位置可准确得到延时时间差。系统的定位精度与采样频率有直接关系,在采样率为20MHz时,理论上的定位精度可达10.22m。提出了一种分段数据处理方法,该方法可以在保证高采样率带来的高定位精度的基础上降低算法的运算量。实验结果表明,运算速度比传统方法提高约8倍。
Based on the optical fiber Mach-Zehnder (M-Z) interference technique, the perimeter defense system is studied and designed. Signal extraction is achieved by a combination of improved dual-fiber M-Z interferometric phase detection and cross-correlation algorithm. The application of cross-correlation algorithm in system positioning is introduced in detail, and its feasibility is verified through experiments. Cross-correlation operation is performed on the same signal with two different delays, and the delay time difference can be accurately obtained through the peak position. System positioning accuracy and sampling frequency is directly related to the sampling rate of 20MHz, the theoretical positioning accuracy of up to 10.22m. A segmentation data processing method is proposed, which can reduce the computational complexity of the algorithm based on the high positioning accuracy of high sampling rate. Experimental results show that the computing speed is about 8 times higher than the traditional method.