發(fā)布時(shí)間：2018-12-15 13:58

【摘要】：為進(jìn)一步提高InSAR系統(tǒng)的DEM精度,分析非線性ECS自配準(zhǔn)成像算法中4個(gè)影響相位保持精度的因素。研究結(jié)果如下:雷達(dá)和散射體之間的相對(duì)速度等效誤差非常小,可以忽略;當(dāng)系統(tǒng)分辨率優(yōu)于0.1 m時(shí),非線性自配準(zhǔn)中的二次近似誤差會(huì)引起超過0.1個(gè)像素的誤差,要考慮其影響;非線性變標(biāo)中的二階泰勒近似誤差非常小,可以忽略;成像時(shí)采用的平地假設(shè)誤差,主要會(huì)引起干涉運(yùn)動(dòng)補(bǔ)償?shù)能壽E誤差和相位補(bǔ)償誤差,對(duì)于高精度InSAR系統(tǒng)(高程精度優(yōu)于0.5 m時(shí)),會(huì)造成一定的影響,要予以考慮。這些誤差因素的分析,將為進(jìn)一步優(yōu)化提高InSAR成像處理中的相位保持精度及DEM精度提供一定的指導(dǎo)作用。
[Abstract]:In order to further improve the DEM accuracy of InSAR system, four factors affecting the phase retention accuracy in nonlinear ECS self-registration imaging algorithm are analyzed. The results are as follows: the relative velocity equivalent error between radar and scatterer is very small and can be neglected; When the resolution of the system is better than 0.1 m, the quadratic approximation error in nonlinear self-registration will cause errors of more than 0.1 pixels, which should be considered, and the second-order Taylor approximation error in nonlinear scaling is very small and can be neglected. The error of flatness assumption used in imaging will mainly cause the trajectory error and phase compensation error of interference motion compensation, which will have some influence on the high precision InSAR system (when the height accuracy is better than 0. 5 m), which should be considered. The analysis of these error factors will provide some guidance for further optimization and improvement of phase retention accuracy and DEM accuracy in InSAR imaging processing.
【作者單位】： 長(zhǎng)沙理工大學(xué)電氣與信息工程學(xué)院;西安科技大學(xué)通信與信息工程學(xué)院;長(zhǎng)沙理工大學(xué)交通運(yùn)輸工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(41201468,61302133,61302165) 湖南省重點(diǎn)實(shí)驗(yàn)室基金 湖南省教育廳項(xiàng)目(16B003,16C0043) 長(zhǎng)沙理工大學(xué)公路養(yǎng)護(hù)技術(shù)國(guó)家工程實(shí)驗(yàn)室開放基金重點(diǎn)項(xiàng)目(kfj150105)資助
【分類號(hào)】：TN958

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本文編號(hào)：2380777