Galileo System Simulation Facility (GSSF)

GalileoThe Galileo System Simulation Facility (GSSF) is conceived as a simulations environment that reproduces the functional and performance behaviour of the Galileo system to support the simulation needs during the entire Galileo programme lifecycle.

 

Simulation Capabilities

GSSF provides a single simulator that uses alternative models depending upon the type of analysis the end-user wishes to perform:

  • Service Volume Simulation (SVS): Navigation and integrity performance analyses over longer time periods and over large geographical areas
  • Raw Data Generation (RDG): Galileo and GPS raw data production for experimental purposes (RINEX 3.00 observation and IGS SP3)

 

GSSF enables simulation of the nominal system and also its various degraded modes, in a deterministic or probabilistic manner. The Space Segment and User Segment are not limited to Galileo and provide GPS and EGNOS related models.

 

GSSF offers a rich set of functionality to allow the user to:

  • Set up and configure simulation scenarios and simulation runs
  • Run a simulation (as fast as possible and in real-time mode)
  • Analyse Data
  • Visualise Data
  • Import and export data
  • Perform Model Development

 

GSSF provides a modern and flexible Man Machine Interface, where key ele-ments such as the Property Grid are used to simplify user customisation. The Property Grid displays the properties of whichever element is selected in the workspace. Properties of the selection can be viewed but also edited from the Property Grid.

 

A reporting feature is available that al-lows exporting simulation reports in RTF and PDF format. By this means, the complete simulation/scenario definition including parameter settings can be re-ported via an auto-generated document.

 

GSSF V2.0 Figures of Merit

Visibility Analyses

  • Global or Regional Visibility
  • Receiver to Satellite Visibility
  • Ground Segment to Satellite Visibility

 

Coverage Analyses

  • Global or Regional Depth of Coverage
  • Ground Segment to Satellite Inverse Depth of Coverage
  • Ground Segment to Satellite Availability of Depth of Coverage
  • Independent Integrity Path Coverage

 

Geometry Analysis

  • Receiver to Satellite Geometry

 

DOP Analyses

  • Global or Regional DOP
  • Global or Regional Availability of DOP

 

Navigation Performance Analyses

  • Global or Regional NSP
  • Global or Regional Availability of NSP with and without failures
  • Global or Regional Continuity of NSP

 

Integrity Analyses

  • Global or Regional Integrity
  • Global or Regional Availability of Integrity
  • Global or Regional Continuity of Integrity
  • Service Analyses
  • Global or Regional Availability of Service
  • Global or Regional Critical Satellites

 

Interference Analysis

  • Global or Regional Interference
  • Link and Error Budget Analyses

 

Upgrade to GSSF SVS

The following upgrades are currently being applied to GSSF SVS:

  • Implementation of the Signal-in-Space-Monitoring-Accuracy (SISMA)
  • Include latest Galileo Integrity concept
  • Implementation of Contact Planning/Uplink Scheduling
  • User Dynamics (mobile users)
  • SBAS/EGNOS support

 

Upgrade to GSSF RDG

The following upgrades are currently being applied to GSSF RDG:

  • Further enhance Ionosphere and Troposphere modelling
  • Antenna Phase Centre Offset
  • Code Tracking Error Variance
  • HW Biases and Receiver Cycle Slips
  • Earth Solid Tides
  • Solar Radiation Pressure Model (Galileo-specific)
  • RDG Model Calibration against real GIOVE-A satellite data

 

Platform

GSSF is developed on Windows 2000/XP (.NET), while models are kept platform independent and are implemented in C++.

GSSF V2.0 (SVS & RDG) now available.

 

Users can apply for a license free of charge at www.gssf.info. GSSF is being developed on behalf of ESA/ESTEC by a multi-national consortium lead by VEGA Deutschland.