There are three criteria for determining if a solution is acceptable:
1) The uncertainties in the baseline components must have the same magnitude of the a priori constraints applied to station coordinates and orbital parameters
2) A good solution produces a “normalized rms” (nrms) of about 0.25. Anything larger then 0.5 indicates that there are problems (e.g., cycle slips that have not been removed, bad coordinates of the fixed stations, …)
3) The fractional part of the solution (Fract) must be smaller than 10.