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中文摘要：
对地下管道电缆等目标的几何特征估计在城市建设和市政基础设施维护中尤为重要,针对此类埋地细长良导体目标,该文提出一种基于瞬态电磁响应的管道目标长度与方位角估计方法。建立了介电媒质中水平极化电磁波在布鲁斯特角入射下细长良导体目标后向散射回波时延差模型,通过分析瞬态响应时频分布,建立了其谐振态与目标长度的关系,并由此估计目标的长度。利用瞬态响应早时部分首达回波与晚时部分谐振回波的能量变化趋势,判断电磁波到达目标两端点的时间顺序,再根据首达时间延迟差估计目标的方位角。数值仿真结果表明在电场方向与目标轴线方向偏离不大的情况下,提出方法有效并且对噪声具有鲁棒性,适用于信噪比SNR≥5 dB的长度估计以及SNR〉10 dB的方位角估计。
英文摘要：
It is particularly important to estimate the geometric features of buried pipe cables in urban construction and municipal infrastructure maintenance. For this kind of subsurface thin-wire structure targets, a method for estimation of the length and orientation of a target based on transient electromagnetic responses is proposed. In this method, a time delay difference model of the backscattering responses from such thin-wire structures illuminated by electromagnetic wave at Brewster＇s angle with horizontal polarization is established. By analyzing the time-frequency distribution of the transient responses, the relationship between the resonant state and the target length is established and the length of the target is estimated. The energy change between the early time responses and late time resonances is applied to determining the time sequence of the arrival of the electromagnetic wave to the target. Then the target orientation is estimated by the time delay difference of early time responses. Numerical simulation results show that the proposed method is effective in the case of the direction of electric field close to the target axial direction. Meanwhile, the proposed method is robust to noise, and can be applied to length estimation for SNR ≥ 5 dB and orientation estimation for SNR〉10 dB.
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