Ground-based navigation signal generation method and system

The invention belongs to the technical field of positioning navigation, and discloses a ground-based navigation signal generation method and system, an intermediate frequency TH/DS-CDMA signal is generated in a digital domain, and a designed sequential logic circuit is divided into a low-speed clock circuit module and a high-speed clock circuit module; based on an input reference clock refclk, the clock management module is responsible for generating lsclk and hsclk which are in homologous relation; a low-speed clock circuit is used for generating a pseudo code modulated by a message and a time hopping control signal under the driving of a low-speed clock lsclk; an intermediate frequency digital carrier signal is generated under the driving of a high-speed clock hsclk by using a high-speed clock circuit module, a pseudo code is modulated to an intermediate frequency carrier, and gating emission control of a time hopping signal is carried out. The metastable state problem is avoided, meanwhile, the maximum des