The GRANADA Bit-True Software Receiver simulator recreates the Galileo/GPS signal-in-space and the receiver signal processing chain using a sampled-based simulation approach. Developed in Matlab/Simulink to provide high modularity, it targets receiver experts in the development and analysis of the receiver core technologies. The tool enables analyses and simulations of the receiver critical algorithms and architecture design, such as acquisition and tracking, AltBOC performance, multipath, and interference analysis. GRANADA can be used as a receiver design test bench that includes the possibility to integrate and analyse user defined algorithms.

The tool simulates all the Galileo and GPS channels at the selected carrier frequency. It includes ranging  codes  generation, data and BOC modulation,  IF - upconversion and filter design.  The transmitter module includes E5 AltBOC modulation scheme, MBOC signals, and the new GPS open service and commercial channels.

Environment model

The propagation channel receiver allows the simulation of different environmental effects, including AWGN, multipath delay, external interference, and system dynamics. The multipath model consists of the sum of a direct ray and several indirect paths affected by a random fading component. Interference modelling includes band-limited Gaussian noise and GPS interference. The relative dynamics between the receiver and the satellite is considered including both code and carrier Doppler shifts in the transmitted signal.

Requirements