主星帶小衛(wèi)星分布式SAR干涉的相對(duì)測(cè)高精度分析
Analysis of Relative Height Accuracy for Master Satellite and Distributed Small Satellite SAR Interferometry
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摘要: 相對(duì)測(cè)高精度是干涉SAR測(cè)高性能的重要指標(biāo)之一。該文根據(jù)主星帶小衛(wèi)星分布式SAR系統(tǒng)的實(shí)際空間幾何條件下建立了干涉測(cè)高原理；基于相對(duì)測(cè)高幾何，推導(dǎo)了相對(duì)測(cè)高精度與干涉相位誤差的關(guān)系式；理論分析了基線去相關(guān)、圖像配準(zhǔn)誤差去相關(guān)、熱噪聲去相關(guān)等，并推導(dǎo)了圖像相關(guān)系數(shù)；最后，仿真分析了圖像去相關(guān)因素對(duì)于主星帶小衛(wèi)星分布式SAR干涉的相對(duì)測(cè)高精度影響。結(jié)果發(fā)現(xiàn)：對(duì)于平坦地形來(lái)說(shuō)，熱噪聲與配準(zhǔn)誤差是影響相對(duì)測(cè)高精度的主要因素，而基線去相關(guān)影響相對(duì)較小。Abstract: Relative height accuracy is one of key indexes for SAR interferometry. In this paper, based on actual geometrical condition for master satellite and distributed small satellite SAR system, height measure principle is established. Based on geometrical condition of relative height measure, the relations between relative height accuracy and interferometric phase error are deduced. Then, noise decorrelation, baseline decorrelation and pixel misregistration decorrelation and so on, are analyzed, and the image correlation coefficient is deduced. Finally, the effect of image decorrelations to relative height accuracy is analyzed, the results indicate, for flat surface, noise decorrelation and pixel misregistration decorrelation are the main factors, and baseline decorrelation is the minor factor.
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