基于瞬態(tài)電磁響應(yīng)的埋地細(xì)長(zhǎng)良導(dǎo)體目標(biāo)長(zhǎng)度和方位估計(jì)
doi: 10.11999/JEIT160718
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1.
(西安電子科技大學(xué)電子工程學(xué)院 西安 710071) ②(桂林電子科技大學(xué)廣西無(wú)線寬帶通信與信號(hào)處理重點(diǎn)實(shí)驗(yàn)室 桂林 541004)
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61371186, 61162007)，廣西自然科學(xué)基金(2013GXNSFFA019004)
Estimation of Length and Orientation of Subsurface Thin-wire Structures Based on Transient Electromagnetic Responses
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1.
(School of Electronic Engineering, Xidian University, Xi&rsquo
Funds:
The National Natural Science Foundation of China (61371186, 61162007), Guangxi Natural Science Foundation (2013GXNSFFA019004)
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摘要: 對(duì)地下管道電纜等目標(biāo)的幾何特征估計(jì)在城市建設(shè)和市政基礎(chǔ)設(shè)施維護(hù)中尤為重要，針對(duì)此類埋地細(xì)長(zhǎng)良導(dǎo)體目標(biāo)，該文提出一種基于瞬態(tài)電磁響應(yīng)的管道目標(biāo)長(zhǎng)度與方位角估計(jì)方法。建立了介電媒質(zhì)中水平極化電磁波在布魯斯特角入射下細(xì)長(zhǎng)良導(dǎo)體目標(biāo)后向散射回波時(shí)延差模型，通過(guò)分析瞬態(tài)響應(yīng)時(shí)頻分布，建立了其諧振態(tài)與目標(biāo)長(zhǎng)度的關(guān)系，并由此估計(jì)目標(biāo)的長(zhǎng)度。利用瞬態(tài)響應(yīng)早時(shí)部分首達(dá)回波與晚時(shí)部分諧振回波的能量變化趨勢(shì)，判斷電磁波到達(dá)目標(biāo)兩端點(diǎn)的時(shí)間順序，再根據(jù)首達(dá)時(shí)間延遲差估計(jì)目標(biāo)的方位角。數(shù)值仿真結(jié)果表明在電場(chǎng)方向與目標(biāo)軸線方向偏離不大的情況下，提出方法有效并且對(duì)噪聲具有魯棒性，適用于信噪比SNR5 dB的長(zhǎng)度估計(jì)以及SNR10 dB的方位角估計(jì)。
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關(guān)鍵詞:
- 瞬態(tài)響應(yīng) /
- 諧振 /
- 長(zhǎng)度估計(jì) /
- 方位估計(jì)
Abstract: 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 Brewsters 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 forSNR5 dB and orientation estimation for SNR10 dB.-
Key words:
- Transient responses /
- Resonances /
- Length estimation /
- Orientation estimation
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