COMPENSATION OF THE IONOSPHERIC EFFECTS ON SAR INTERFEROGRAM BASED ON RANGE SPLIT-SPECTRUM AND AZIMUTH OFFSET METHODS – A CASE STUDY OF YUSHU EARTHQUAKE

التفاصيل البيبلوغرافية
العنوان: COMPENSATION OF THE IONOSPHERIC EFFECTS ON SAR INTERFEROGRAM BASED ON RANGE SPLIT-SPECTRUM AND AZIMUTH OFFSET METHODS – A CASE STUDY OF YUSHU EARTHQUAKE
المؤلفون: Wu Zhu, Y. F. He, Wen-Ting Zhang, Qiying Zhang
المصدر: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3, Pp 505-509 (2018)
سنة النشر: 2018
مصطلحات موضوعية: lcsh:Applied optics. Photonics, Offset (computer science), lcsh:T, 0211 other engineering and technologies, lcsh:TA1501-1820, 02 engineering and technology, Geodesy, lcsh:Technology, Compensation (engineering), Physics::Geophysics, Azimuth, Deformation monitoring, lcsh:TA1-2040, Interferometric synthetic aperture radar, Range (statistics), Ionosphere, lcsh:Engineering (General). Civil engineering (General), Geology, Noise (radio), 021101 geological & geomatics engineering
الوصف: InSAR technique can measure the surface deformation with the accuracy of centimeter-level or even millimeter and therefore has been widely used in the deformation monitoring associated with earthquakes, volcanoes, and other geologic process. However, ionospheric irregularities can lead to the wavy fringes in the low frequency SAR interferograms, which disturb the actual information of geophysical processes and thus put severe limitations on ground deformations measurements. In this paper, an application of two common methods, the range split-spectrum and azimuth offset methods are exploited to estimate the contributions of the ionosphere, with the aim to correct ionospheric effects in interferograms. Based on the theoretical analysis and experiment, a performance analysis is conducted to evaluate the efficiency of these two methods. The result indicates that both methods can mitigate the ionospheric effect in SAR interferograms and the range split-spectrum method is more precise than the other one. However, it is also found that the range split-spectrum is easily contaminated by the noise, and the achievable accuracy of the azimuth offset method is limited by the ambiguous integral constant, especially with the strong azimuth variations induced by the ionosphere disturbance.
وصف الملف: application/pdf
اللغة: English
تدمد: 2194-9034
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21d305bb356640584a5e4421ac8c071e
https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-3/505/2018/
Rights: OPEN
رقم الانضمام: edsair.doi.dedup.....21d305bb356640584a5e4421ac8c071e
قاعدة البيانات: OpenAIRE