1[2]Akos,Dennis M. , and Tsui,James B.Y."Design and Inplementation of a Direct Digitization GPS Receiver Front End", Dec.1996, IEEE Transactions on Microware Theory and Techniques.
2[3]www. mc21st. com
3[4]www. cfrsi. com
4[5]www. navsys. com
5[6]Dennis M. Akos, Per-Ludvig Normark,Per Enge, Stanford University" RealTime GPS Software Radio Receiver"
6[7]Neil Gerein, Alison Brown, NAVSYS Corporation "Modular GPS Software Radio Ar chitecture"
