Читать книгу Global Navigation Satellite Systems, Inertial Navigation, and Integration - Mohinder S. Grewal - Страница 32

The L1/E1 band (sometimes denoted as L1 for convenience) spans the frequency range from 1559 to 1591 MHz and contains a G/NAV signal used by the PRS service and an I/NAV signal used by the OS and CS services. The G/NAV signal has only an in‐phase component with a BOC spreading code and data modulation. The I/NAV signal has an in‐phase and quadrature component. The in‐phase component contains 250‐sps data modulation with a BOC(1,1) spreading code. The quadrature component is data‐free and utilizes a combined BOC signal.