面向钻孔救援的UWB雷达回波信息处理关键问题研究进展

    Research progress on key issues of UWB radar echo information processing for borehole rescue

    • 摘要: 钻孔救援技术作为一种生命通道快速构建的新型救援技术已得到广泛应用。UWB雷达可基于钻孔实现非视条件下的人员生命信息探测,但UWB雷达回波易受井下环境噪声、背景杂波和探测目标运动状态影响,难以从中获得有效的被困人员生命信息。对基于钻孔救援的UWB雷达回波信息处理研究现状进行归纳总结:从杂波滤除方法、算法和模型3个方面对杂波的滤除现状进行梳理总结;从时域/频域分析方法、时频分析方法、数字处理技术和其他处理方式4个方面对有效特征提取的研究现状进行归纳;得出当前在钻孔救援中UWB雷达回波信息处理存在的主要问题:杂波滤除技术和滤除种类比较单一且缺乏滤波后信息验证、缺乏多类型的微多普勒特征提取、矿井灾害环境下UWB雷达回波信息处理研究较少、现有信息处理设备不能满足矿山钻孔救援需求。提出UWB雷达回波信息处理在钻孔救援中的发展趋势:①结合时频分析方法和多域处理进行杂波滤除研究;②利用神经网络模型研究基于钻孔救援的UWB雷达回波成分,并与地面环境对比;③运用ICA算法提取多种微多普勒特征,利用同步挤压短时傅里叶变换提取运动特征,基于互相关的联合多距离门信号的体征提取算法加强心跳信号提取;④研发融合多领域技术设备满足钻孔救援需求,扩充井下回波数据训练集,建立深度自学习的有效特征数据库。

       

      Abstract: Borehole rescue technology has been widely used as a new rescue technique for the rapid construction of life way. UWB radar can be used to detect life information under non-visual conditions, but the UWB radar echoes are easily affected by the noise environment, background clutter and detecting the movement of a target in the underground, which makes it difficult to obtain effective information about the lives of trapped people. This paper summarizes the current status of UWB radar echo information processing for borehole rescue: the current status of clutter filtering is summarized from three aspects including clutter filtering methods, algorithms and models; the current status of effective feature extraction is summarized from four aspects including time/frequency domain analysis methods, time-frequency analysis methods, digital processing techniques and other processing methods. The main problems with current UWB radar echo information processing in borehole rescue were derived: the filtering technology and filtering type are relatively single and lack of post-filtering information verification, the lack of multiple types of micro-Doppler feature extraction, fewer studies on UWB radar echo information processing in mine disaster environments, and the existing information processing equipment cannot meet the demand of mine borehole rescue. The development trend of UWB radar echo information processing in borehole rescue is proposed: combining time-frequency analysis methods and multi-domain processing for clutter filtering research; using neural network models to study the UWB radar echo components based on borehole rescue and comparing with the surface environment; using ICA algorithm to extract multiple micro-Doppler features, using synchronous squeezed short-time Fourier transform to extract motion features, inter-correlation-based joint multi-distance gate signal for sign extraction algorithm to enhance heartbeat signal extraction; development of multi-disciplinary technical equipment to meet drilling and rescue needs, expand downhole echo data training set, and establish a deep self-learning effective feature database.

       

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