Читать книгу Global Navigation Satellite Systems, Inertial Navigation, and Integration - Mohinder S. Grewal - Страница 31

This band spans the frequency range from 1260 to 1300 MHz and contains a C/NAV signal and a G/NAV signal, each centered at 1278.75 MHz. The C/NAV signal is used by the CS service and has both an in‐phase and a quadrature pilot component using a BPSK spreading code modulation of 5 × 1.023 Mcps. The in‐phase component contains 1000‐sps data modulation, and the pilot component is data‐free. The G/NAV signal is used by the PRS service and has only an in‐phase component modulated by a BOC(10,5) spreading code and data modulation with a symbol rate that is to be determined.