基于PolInSAR相干區(qū)域的最優(yōu)正規(guī)矩陣近似解的地形與樹(shù)高估計(jì)
doi: 10.11999/JEIT160774 cstr: 32379.14.JEIT160774
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1.
(北京理工大學(xué)光電學(xué)院 北京 100081) ②(北京理工大學(xué)信息與電子學(xué)院 北京 100181)
Topography and Tree Height Estimation Based on the Best Normal Matrix Approximation for PolInSAR Coherence Region
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1.
(School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China)
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2.
(School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China)
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摘要: 森林區(qū)域林下地形及樹(shù)高的反演是極化干涉雷達(dá)的一個(gè)重要應(yīng)用。該文首先對(duì)極化干涉SAR數(shù)據(jù)的相干區(qū)域進(jìn)行建模及運(yùn)用最優(yōu)正規(guī)矩陣近似干涉互相關(guān)矩陣，得到白化正規(guī)干涉互相關(guān)矩陣。白化正規(guī)干涉互相關(guān)矩陣的相干區(qū)域?yàn)橐粭l直線，任意求得兩個(gè)不同極化狀態(tài)下的相干系數(shù)進(jìn)行直線擬合，完成地表的估計(jì)，再結(jié)合體散射去相干與樹(shù)高之間的關(guān)系，運(yùn)用查表方法完成樹(shù)高的估計(jì)。該方法回避了傳統(tǒng)方法中求解所有極化狀態(tài)下的相干系數(shù)估計(jì)及相干區(qū)域邊緣提取的步驟，在簡(jiǎn)化參數(shù)反演提升估計(jì)效率的同時(shí)獲得正確地表與樹(shù)高估計(jì)，最后運(yùn)用仿真數(shù)據(jù)完成算法有效性與可靠性的驗(yàn)證。
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關(guān)鍵詞:
- 極化干涉合成孔徑雷達(dá) /
- 相干區(qū)域 /
- 最優(yōu)正規(guī)矩陣近似 /
- 地形與樹(shù)高反演
Abstract: The inversion of topography and tree height in forest area is one of the most important applications in the Polarimetric SAR Interferometry (PolInSAR). In this paper, the coherent region of the PolInSAR data is modeled and the best normal matrix is used to approximate the cross correlation matrix, further, the whitened interferometric cross-correlation matrix is obtained. The coherence region of the whitened interferometric cross-correlation matrix is a straight line. Two arbitrary coherences obtained under two different polarization states can be applied to fitting a straight line. Based on the fitting line, the topographical phase can be estimated successfully. Referring to the relationship between the volume scattering and the tree height, look-up table method is used to search the correct tree height. The proposed method can avoid the complex steps of the traditional method, which needs to solve all the coherences under different polarization states to obtain the edge of the coherent region. The proposed method simplifies the inversion procedure and improves the efficiency of inversion, meanwhile, achieves the correct topography as well as the tree height. Finally, the simulation data are applied to validating the validity and reliability of the proposed method. -
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