Citation
Abstract
This article describes a method for producing improved mapping of radio sources from VLBI data. The method described here is more direct than existing Fourier methods, is often more accurate, and runs at least as fast. The visibility data is modeled here, as in existing methods, as a function of the unknown brightness distribution and the unknown antenna gains and phases. We want to choose these unknowns so that the resulting function values are as near as possible to the observed values. If we use the RMS deviation to measure the closeness of this fit to the observed values, we are led to the problem of minimizing a certain function of all the unknown parameters. This minimization problem cannot be solved directly, but it can be attacked by iterative methods which we show converge automatically to the minimum with no user intervention. The resulting brightness distribution will furnish the best fit to the data among all brightness distributions of given resolution.
Details
- Volume
- 42-82
- Published
- August 15, 1985
- Pages
- 199–210
- File Size
- 375.9 KB