Abstract: An improved acquisition and tracking system for Global Positioning System (GPS) signals. The system relies on block adjustment of the synchronizing signal of the bi-phase shift keying (BPSK) signal in order to obtain correct carrier frequency and phase angle. This improved system has the advantages of being more robust in the presence of noise than conventional approaches and also of lending itself to simplified implementation since synchronization of the Coarse/Acquisition (C/A) code need only be within half of a chip in order to maintain lock.