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We discuss the software developed for the purpose of determining the relative   coordinates (position angle θ and separation ρ) for visual double or   multiple stars. It is based on application of Fourier transforms in treating   CCD frames of these systems. The objective was to determine the relative   coordinates automatically to an extent as large as possible. In this way the   time needed for the reduction of many CCD frames becomes shorter. The   capabilities and limitations of the software are examined. Besides, the   possibility of improving is also considered. The software has been tested   and checked on a sample consisting of CCD frames of 165 double or multiple   stars obtained with the 2m telescope at NAO Rozhen in Bulgaria in October   2011. The results have been compared with the corresponding results obtained   by applying different software and the agreement is found to be very good

Relative-coordinate determination for visual double stars by applying Fourier transforms