It shows how long the certain parts are observable from ground VLBI stations and satellites during a time interval. CheckArc gives information about the possible attitudes of space VLBI satellite when observing a selected radio source during a time interval. It takes the on-board observing constrains into account. Beam selects radio sources within the primary beam of space VLBI antenna for phase referencing purposes. Cone selects radio sources in special geometric configurations with respect to the satellite orbit normal.
Calculator performs basic calculations, unit conversions and coordinate transformations.
These tools are widely available at possible users' site. Screen outputs of SatVis , SubSat and ObsInt operations. After the collection of user requirements the logical model of the software was set up first. Then we defined the structural levels of the program and the interfaces of each module. Now the development is in the so called detailed design phase.