GPS Software Receiver (GSR) is a Software Radio Technology based new receiver architecture. Because of the abilities of accessible to the inside architectures and reprogramebale to the kernel algorithms, GSR provides a powerful tool for GPS research. The users only need to develop high performance algorithm module to upgrade the whole system. The GSR has become one of the most important directions in GPS modernization. On one hand, the research on GSR provides opportunities to learn and master the key techn...