电离层层析成像技术与电离层反演
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摘要
系统介绍了利用电离层层析成像技术进行电离层反演的理论、模型及相应的计算流程。针对电离层层析成像反演算法对初始值比较敏感的特点,提出一种改进算法计算了电离层电子密度剖面,计算结果表明,改进算法可以改善电离层层析成像质量,具有高精度、大空间、实时等优点;最后介绍了电离层层析成像技术应用于电离层预报及地震前兆监测的前景。
Computerized lonospheric tomography theory,models and computation flow are discussed systematically.An improved reconstruction algorithm is proposed.The electronic density profiles are derived using the new algorithm.The results demonstrate that the new algorithm avoids sensitivity of MART to the initial guess,and computerized lonospheric tomography has the ability to acquire more accurate profiles in wider range.Finally,the prospect for using computerized lonospheric tomography to monitor seismic precursor are discussed.
Computerized lonospheric tomography theory,models and computation flow are discussed systematically.An improved reconstruction algorithm is proposed.The electronic density profiles are derived using the new algorithm.The results demonstrate that the new algorithm avoids sensitivity of MART to the initial guess,and computerized lonospheric tomography has the ability to acquire more accurate profiles in wider range.Finally,the prospect for using computerized lonospheric tomography to monitor seismic precursor are discussed.
引文
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[2]Pryse S E.Radio Tomography:A New Experi mental tech-nique.Sury.Geophys.2003(24):1-38.
[3]徐继生,马淑英.电离层无线电层析[A].空间物理前沿进展[C].北京:北京气象出版社,1998.
[4]高欣.新型迭代图像重建算法的理论研究和实现[M].杭州:浙江大学,2004.
[5]徐继生,马淑英,阳其罕,等.东亚赤道异常区电离层CT诊断实验及初步结果[J].地球物理学报,1995,38(5):553-563.
[6]Raymund T D,Austen J R,Franke S J,et al.Application ofComputerized Tomography to the Investigation of Iono-spheric Structures[J].Radio Science,1998,25(5):771-789.
[7]Yizengaw E,Moldwin M B,Dyson P L,et al.First Tomo-graphic I mage of Ionospheric Outflows[EB/OL].http://www.igpp.ucla.edu/.2006,33(20).
[8]Yaevz E,Arikan F,Arikan O.A Hybrid Reconstruction Al-gorithmfor Computerized Ionospheric Tomography[J].Re-cent Advances in Space Technologies,2005,9(11):782-787.
[9]Tsai L C.Tomographic I maging of the Ionosphere Using theGPS/METand NNSS Data[J].Journal of At mospheric andSolar-Terrestrial Physics,2002,64(18):2 003-2 011.
[10]Giulio Ruffini,Alejandro Flores,Antonio Rius.GPS Tomo-graphy of the Ionospheric Electron Content with a Correla-tion Functiona[J].IEEE,1998,36(1):143-153.
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