In order to cope with such illconditioning, a new tomographic algorithm, termed twostep algorithm tsa, is presented. The reconstructed ionospheric maps are compared with the truth ionosphere to calculate the difference between the images and the truth. Imaging the threedimensional ionospheric structure with a. Home books geodetic sciences observations, modeling and applications. D electron density in the ionosphere is presented ionospheric parameters are optimized by using parametric disturbance surfaces obtained results are compliant with b. A constrained ionospheric tomography algorithm with. Although considerable progress has been made in tomographic algorithms over the last few years 1016, the accuracy of 3d ionosphere. These algorithms utilize a singular value decomposition with its. A modelindependent algorithm for ionospheric tomography 2. Ionospheric tomography inverse algorithms are usually an illconditioned problem because the geometric distribution of continuously operating reference gps stations is not ideal for this task. This data set, for which the truth ionosphere is known, is used as input for a tomographic inversion algorithm to estimate the spatial distribution.
This paper presents a modelindependent algorithm for tomography of the. Ionospheric sounding and tomography by gnss intechopen. A modelindependent algorithm for ionospheric tomography. Ad vanced techniques for remote sensing and progressive means for data process ing open the possibility of reconstructing the spatial structure of the medium on the base of.
By vyacheslav kunitsyn, elena andreeva, ivan nesterov and artem padokhin. Numerical simulation scheme is devised to validate the feasibility of the new algorithm. Title, a modelindependent algorithm for ionospheric tomography 2. The test cases chosen make use of experimental electron content observations obtained from a meridional chain of receivers in scandinavia at times when the european incoherent scatter radar facility provided. Constrained simultaneous algebraic reconstruction technique c.
Gridbased tomography, electron density, ionospheric profile, chapman function, gnss. A realistic simulation framework to evaluate ionospheric tomography. A new method for ionospheric tomography and its assessment by. A comparison of reconstruction techniques used in ionospheric. Review of tomographic reconstruction methods of the ionosphere. For the partition of the ionospheric tomography models based on these algorithms, the pixel size in latitude, longitude, and height is constant with 0. The vertical tec vtec and slant tec stec is calculated based on an ionospheric tomography algorithm where the electron density is integrated along the.
This paper compares the performance of three different reconstruction algorithms used for tomographic imaging of the ionosphere. A hybrid reconstruction algorithm for 3d ionospheric tomography article pdf available in ieee transactions on geoscience and remote sensing 466. This data set, for which the truth ionosphere is known, is used as input for a tomographic inversion algorithm to estimate the spatial distribution of electron density. A new twostep algorithm for ionospheric tomography. Abstract an improved ionospheric tomography algorithm is developed for the tomographic reconstruction of the ionospheric electron density. An improved iterative algorithm for ionospheric tomography. Methods of the satellite ionospheric radio tomography are being successfully. Adoption of tomographic methods seems to be an inevitable stage of the evolution of almost all diagnostic systems. Gpsbased ionospheric tomography with a constrained adaptive. A realistic simulation framework to evaluate ionospheric. Prior knowledge consists of the following pieces of information.