2KAPLAN E D. Understanding GPS principes and applications[ M ]. 2nd ed. Boston: Artech House Inc, 2006. 219-232.
3Psiaki M L. Block acquisition of weak GPS signals in a software receiver. In: Proceedings of the Institute of Navigation GPS 2001, Salt Lake City, UT, 2001. 2838- 3850.
4James Bao-Yen Tsui. Fundamentals of global positioning system receivers-a software approach [M]. J OHN Wiley&Sons. Inc,2000.
