- 专利标题: Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination
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申请号: US16879505申请日: 2020-05-20
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公开(公告)号: US11566937B2公开(公告)日: 2023-01-31
- 发明人: Ezra Ip , Yue-Kai Huang , Junqiang Hu , Shuji Murakami
- 申请人: NEC Laboratories America, Inc.
- 申请人地址: US NJ Princeton
- 专利权人: NEC Laboratories America, Inc.
- 当前专利权人: NEC Laboratories America, Inc.
- 当前专利权人地址: US NJ Princeton
- 代理商 Joseph Kolodka
- 主分类号: G01H9/00
- IPC分类号: G01H9/00 ; G01B9/02015 ; G01B9/02 ; G01D5/353 ; G01V1/18
摘要:
Aspects of the present disclosure describe Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination. In illustrative configurations, systems, methods, and structures according to the present disclosure employ a two stage modulation arrangement providing short interrogator pulses resulting in a greater number of sensing data points and reduced effective sectional length. The increased number of data points are used to mitigate Rayleigh fading via a spatial combining process, multi-location-beating combining (MLBC) which uses weighted complex-valued DAS beating results from neighboring locations and aligns phase signals of each of the locations, before combining them to produce a final DAS phase measurement. Since Rayleigh scattering is a random statistic, the MLBC process allows capture of different statics from neighboring locations with correlated vibration/acoustic signal. The combined DAS results minimize a total Rayleigh fade, in both dynamic fading and static fading scenarios.
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