Tomographical simulation


To study the feasibillity of tomographical inversion of measurement data from ALIS a full simulation of the system have been made. This simulation includes various factors that affects the measurements such as the local geometry of the stations, the optical projection function of the optics, various orientations and rotations of the cameras as well as the varying sensitivity over the image due to the different field of view per pixel. Factors that currently are not yet included are to mention a few: varying sensitivity between the different cameras, atmosppheric attenuation and variations in optical transparency through the lens system...

From a simple model of a double auroral arc system the images of the ALIS system have been calculated. To these ideal images a random noise was added to simulate measurements on auroras with different intensity.

Starting with these simulated images the reconstruction was run till reasonable convergence. The general conclusion on this work is that it is possible to get a reconstruction that has errors that are less than some 5 % with signal to noise ratios down to 30, for signal to nooise ratios of 10 or lower the quality of the reconstructions start to deteriorate.
Björn Gustavsson
Last modified: Thu Oct 24 08:26:30 UTC