Stochastic inversion in ionospheric radiotomography

摘要: The stochastic inversion method in ionospheric radiotomography is reviewed with a special emphasis on regularization used the process. Regularization both for preventing vigorous point-to-point oscillations and controlling peak altitude thickness of result. latter usually means importing priori information layer height to solver. In this paper it pointed out that due curvature Earth ionosphere, measurements contain some profile shape even case purely horizontally stratified layer. If could be choosing an appropriate regularization, no additional would needed. Simulation tests are presented which indicate can determined reasonable accuracy without any information. An attempt also made use data determining proper profile. Although success achieved effort, concluded available information, example, ionosonde or incoherent scatter measurements, should ideas tested true obtained from difference Doppler carried Scandinavia, results compared simultaneous observations by European radar. comparison shows agreement, although clear discrepancies occur, instance, bottomside