1. J. Costas, Synchoronous communications, in: Proceedings of IRE, vol. 44, 1956, pp. 1713–1718.
2. J.P. Costas, Receiver for Communication System, US Patent 3,047,659, July 1962.
3. Global Positioning Systems, Inertial Navigation, and Integration;Grewal,2004
4. E. Kaplan, C. Hegarty, Understanding GPS: Principles and Applications, Artech House, 2006.
5. Global Positioning System: Signals, Measurements, and Performance;Misra,2006