Related Processing Of The Vlbi Software Used In Satellite Tracking Of Key Technologies

As a radio astronomical observation technology with very high spacial resolution, Very Long Baseline Interferometry (VLBI) has been widely used in the satellite tracking and orbit determination activities. In the on-going Chinese lunar exploration project, "USB+VLBI" mode will be applied to the lunar satellite navigation. It is a crucial task that how VLBI software correlation processing is used to track satellite.This thesis is focused on two key technologies of VLBI correlation in satellite tracking - Fast Fringe Search (FFS) of VLBI Satellite Signal and VLBI Phase Calibration (PCAL) Signal Extraction. In chapter 3 and 4, their basic principle and algorithm are studied firstly, and then the software realization method is analyzed. Secondly, parallel computation methods are discussed, such as mutli-thread, SSE and etc. Finally, new delay model reconstructed utilizing the result of FFS is compared with prior delay model.Based on the research contents, a program is developed to realize Fast Fringe Search of VLBI satellite signal with the ability of 4 stations, 6 baselines data processing. This pragram can also be used to extract 4 stations, multi-channel VLBI Phase Calibration signals.The research work has been successfully used in the VLBI correlation and the actual satellite tracking. Especially in May 2006, Chinese 4-station VLBI Network carried out the first near realtime tracking experiment for European SMART-1 lunar satellite, and the high accurate delay model provided by FFS was applied and verified.