The Offset Carrier Modulation for GPS Modernization

Abstract

An integral aspect of GPS Modernization is transmission of a new military signal in the current frequency bands around L1 and L2 in addition to the currently used P(Y) code and C/A code signals. There are considerable advantages to a new military signal whose spectrum is distinct from those of the current signals. This paper describes the offset carrier modulations and their characteristics, showing that they provide many advantages for Modernization. The parametric families of linear and binary offset carrier modulations are defined. Various modulation properties are presented and compared for representative binary offset carrier modulation designs relevant to GPS Modernization.