Global Simulator Characteristics

  Signal generation

• Complete orbitography simulation
• Navigation message generation
• Electromagnetic GNSS signal simulation
• Calculation of resulting signal at any earth point, taking in account multiple satellites, propagation effect, Doppler, etc.
• The toolbox currently provides a highly configurable model of satellite, covering various signal configurations for Galileo and GPS IIF.
• PN Generator Switch: This Juzzle Switch activates one of the code generator provided with the toolbox.Most of them are LFSR-band codes generator. A specific node reads the code from a file, another one generates random data for emulation of military codes.
• Multiplier & Sub Node: This Juzzle Node combines the data and the code of a channel, and adds the desired sub-carrier if needed. The sub-carrier can be any amongst BOC, BOCcos, BCS or even AltBOC.
• Mapping Node: This Juzzle Node generates complex sample from two to four binary channels, according to the look-up table provided to generate QPSK or AltBOC modulation, for instance.

Signal propagation & RF stage

The satellite-to-ground propagation node applies attenuation, propagation delay and Doppler shift to the signal. Their evolution can either be calculated in the node or read from an external tool.Other phenomena include thermal noise and multi-path, applying specular model or statistical model based on Rice and Rayleigh distributions.