PEGASUS: Implementing SBAS and GBAS

PEGASUS: Implementing SBAS and GBAS

PEGASUS is a toolset which allows analysis of GNSS data collected from different SBAS and GBAS systems implementing the algorithms issued in the MOPS documents.

This set of tools is designed to assist Air Navigation Service providers and users in evaluating the performances of satellite navigation signals in-space and their augmentation.

The tool provides several functionalities such as computation of position simulating MOPS-compliant receivers and determination of GNSS augmentation attributes like accuracy, integrity, computation of trajectory errors, prediction of continuity and availability and simulation of GBAS ground station processing algorithms.

PEGASUS results support:

  • validation of ICAO, RTCA and EUROCAE GNSS Standards;
  • state campaigns to validate GNSS performance to support local regulatory activities;
  • exchange of comparable results for faster accumulation of relevant statistical data;
  • manufacturer-independent verification of augmentation system performance

Main Features

Pegasus provides the following features:

  • Data plausibility checking;
  • SBAS/GBAS GAST-C/D message content distribution;
  • Static and dynamic performance evaluation;
  • Data integrity analysis;
  • Air data calculations;
  • Statistics accumulation;
  • Multipath investigation;
  • Spatial extrapolation of augmentation system performance and performance prediction;
  • Aircraft Dynamics corrections and translation of data to a common navigation reference point;
  • Graphical CSV data file viewer;
  • Generic data viewers and predetermined GNSS-specific performance analysis graphs.


Since 2003, the GBAS Modular Analysis and Research System (MARS) has been integrated into PEGASUS in order to support GBAS data processing needs and activities.

The MARS modules allow ground station processing and error simulation as well as investigation into the characteristics of the VDB data link standard compliance.

Moreover, it assists air traffic service providers with analysis to aid site approval and to perform the verifications prerequisite for obtaining operational approval of a GBAS installation from their respective safety regulation authorities.

The modules are currently supporting single frequency, single GPS only functionality, CAT-I and CAT-II/III precision approaches but are intended to be extended to support multi-constellation, and multi-frequency systems such as GALILEO. In the context of SESAR, the PEGASUS toolset is intensively used by the GBAS CAT-II/III precision approach work package partners.

Furthermore, the PEGASUS toolset is the core component of the EGNOS Data Collection Network (EDCN), which provides SBAS APV-1 and LPV-200 approach independent performance monitoring and support to the European Commission.


To obtain access to the PEGASUS toolset click here or contact the PEGASUS team.

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