基于分形結(jié)構(gòu)的植被高階相干散射模型研究

饒麗婷; 張曉娟; 王友成; 方廣有

doi:10.11999/JEIT160095

基于分形結(jié)構(gòu)的植被高階相干散射模型研究

doi: 10.11999/JEIT160095

2.
(中國(guó)科學(xué)院電磁輻射與探測(cè)技術(shù)重點(diǎn)實(shí)驗(yàn)室北京 100190) ②(中國(guó)科學(xué)院大學(xué) 北京 100049)

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61172017)

計(jì)量
- 文章訪問數(shù): 1299
- HTML全文瀏覽量: 131
- PDF下載量: 331
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-01-21
- 修回日期: 2016-07-01
- 刊出日期: 2016-10-19

High-order Coherent Scattering Model for Vegetation with Fractal Structures

2.
(Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China)

Funds:

The National Natural Science Foundation of China (61172017)

摘要

摘要: 電磁波低頻入射情況下，植被中散射體獨(dú)立不相關(guān)的假設(shè)無效，此時(shí)應(yīng)考慮散射體之間的相干效應(yīng)以及近場(chǎng)互作用。該文提出一種基于分形結(jié)構(gòu)的植被高階相干散射模型，該模型利用分形理論生成近乎真實(shí)植被的3維幾何結(jié)構(gòu)，根據(jù)每個(gè)散射體的空間位置信息考慮了相干效應(yīng)，應(yīng)用互易定理計(jì)算了相鄰散射體間高階互作用，結(jié)合非相干的分層模型中后向散射機(jī)制劃分方式，給出了各項(xiàng)散射機(jī)制的表達(dá)式。與機(jī)載合成孔徑雷達(dá)實(shí)驗(yàn)數(shù)據(jù)對(duì)比，驗(yàn)證了模型的準(zhǔn)確性。在針葉林仿真參數(shù)下，分析了各項(xiàng)散射機(jī)制對(duì)總散射效應(yīng)的貢獻(xiàn)與入射頻率、角度、植被結(jié)構(gòu)的關(guān)系，結(jié)果表明，低頻入射條件下，稀疏植被散射模型可進(jìn)一步簡(jiǎn)化從而應(yīng)用于參數(shù)反演中。
- 植被 /
- 分形結(jié)構(gòu) /
- 相干效應(yīng) /
- 近場(chǎng)互作用 /
- 后向散射
Abstract: At low frequency, the assumption of independent scattering of the scatterers in vegetation medium is no longer valid. The coherent effect and near field interactions should be considered. In this paper, a high-order coherent scattering model for vegetation with fractal structure is presented. The fractal theory is employed to generate a realistic 3-D spatial structure of vegetation. The near field interaction between scatterers is formulated using an efficient algorithm based on the reciprocity theorem. For the coherent effect, every scatterer with a deterministic location is taken into account. The main scattering mechanisms are defined in the way of layered vegetation model, allowing better understanding of microwave interaction with trunk-crown structure. Good agreements are obtained from the comparisons of the theoretical predictions with the multifrequency and multipolarization measurement results of boreal forest. Through an extensive ground truth, theoretical analysis of the contribution of the scattering mechanisms for various frequencies, incident angles and vegetation structures is carried out. It is found that under specified conditions the vegetation scattering model can be simplified according to the main contribution scattering mechanism which can be applied to the inversion issue.
- Vegetation /
- Fractal structures /
- Coherent effect /
- Near field interaction /
- Backscattering.

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