For VLBI (Very Long Baseline Interferometry) satellite tracking, the raw observational data should be processed by cross correlation and post-correlated data processing. Through correlation, delay calibration and fringe search, the satellite's baseline geometric delays are finally calculated. Here, a software package used for satellite interferometric data processing was developed based on several open source astronomical software packages. The system can work in both real-time and post-event modes to perform cross correlation, atmospheric delay, ionospheric delay, clock-model, and instrumental delay calibrations, fringe search, and generate baseline delay and delay rate sequences. Satellite baseline delay sequences with an accuracy of 1--2ns was successfully obtained by using this system to process the interferometric data of Beidou GEO (Geosynchronous Earth Orbit) satellites.