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Step-adaptive accelerated demodulation algorithm for LFM pulse-based distributed acoustic sensing

Applied Optics
  • Zhongquan Chen, Junfeng Jiang, Kun Liu, Mingjiang Zhang, Shuang Wang, Zhenyang Ding, and T. Liu
  • received 02/25/2024; accepted 04/12/2024; posted 04/16/2024; Doc. ID 522323
  • Abstract: We propose a novel step-adaptive cross-correlation algorithm tailored for distributed acoustic sensing systems based on linear frequency modulation pulses, aiming for rapiddemodulation. This algorithm adjusts its step length through an adaptive "successive refinement"search strategy, which greatly improves computational efficiency by reducing the number ofcross-correlation computations. Experimental results have shown that the demodulation time canbe reduced by approximately 15 times compared to the conventional method, while maintainingthe same demodulation result.