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Articles by Longxiang Guo
Total Records ( 2 ) for Longxiang Guo
  Xiao Zhang , Jingwei Yin , Pengyu Du and Longxiang Guo
  The study aims at improving the SNR at receiver during the long distance underwater acoustic communication. Pattern time delay shift coding underwater acoustic communication technique has been combined with single vector signal processing technique using prior code pattern knowledge to estimate communication transmitting node’s position based on the active acoustic intensity average. And then linearly combines the sound pressure and the vibration velocity signals to form a combined directivity according to the estimated transmitting node’s position. Theoretical analysis and the simulation study show the combined directivity can improve the SNR at the receiver. The robustness and practicality of the system are verified.
  Liang Zhang , Yingzi Wu , Longxiang Guo and Ping Cai
  It has been estimated that more than 20% of water supply is being lost due to leakage. In order to promptly find out the leakage from water pipelines, the paper proposes a complete solution of leak acoustic signal correlator for leak detection. When leakage occurs, leak acoustic signals would propagate along the wall of water pipelines which are usually strong correlation. Cross-correlation algorithm is relatively effective for leak detection. And it is often conducted to analyze leak acoustic signals, picked up at both sides of a leak, to determine the position of leak. Based on the principle of leak detection, a set of leak acoustic signal correlator has been designed and implemented, including key parameters selection, circuit design and software development. Key parameters have been determined to ensure the positioning precision and detection distance of leak acoustic signal correlator. Meanwhile in order to satisfy the demands of real-time processing, the architecture of signal processor employs DSP+FPGA as its dual-core. Related tests shows the solution proposed in this paper could be adapted to different occasions of leakage by changing parameters which could also be upgraded as a platform for further study.
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