光纤分布式声传感用扩频码的对比分析
Comparative Analysis of Spread-Spectrum Codes for Fibre-Optic Distributed Acoustic Sensing
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中文总结 AI 辅助
本文通过数值模拟对比多种编码序列的性能，发现高多样性序列在光纤分布式声传感系统中相位噪声鲁棒性更优，明确了相关质量、相位噪声鲁棒性与实现约束间的性能权衡。
中文摘要 AI 辅助
本文通过数值模拟对分布式声传感系统的多种编码序列进行了全面的性能对比。相关分析表明，完美自相关序列可提供准确的信道估计。相位噪声灵敏度随频率多样性变化显著，高多样性序列在激光线宽增大时仍能保持较低的相位和强度估计误差。对于激光线宽为10 Hz的编码分布式声传感系统，在1.5 km光纤长度下，高多样性序列的相位误差为2.7×10⁻³ rad，而低多样性码的相位误差为5.3×10⁻³ rad。该研究结果明确了下一代光纤分布式声传感系统在相关质量、相位噪声鲁棒性与实际实现约束之间的性能权衡关系。
英文摘要
This paper presents a comprehensive performance comparison of several coded sequences for distributed acoustic sensing systems through numerical simulations. Correlation analysis reveals that perfect autocorrelation sequences provide accurate channel estimation. Phase noise sensitivity varies significantly with frequency diversity, with high-diversity sequences maintaining lower estimation errors for phase and intensity despite increased laser linewidths. For a coded distributed acoustic sensing system with \qty{10}{\hertz} laser linewidth, high-diversity sequences achieve $2.7\times10^{-3}$ rad phase error compared to $5.3\times10^{-3}$ rad for low-diversity codes for a \qty{1.5}{\kilo\meter} fibre length. The findings establish performance trade-offs between correlation quality, phase noise resilience, and practical implementation constraints for next-generation fibre-optic distributed acoustic sensing systems.
