QualiSaR
Development of a Qualification Procedure for the Usage of Galileo Satellite Receivers for Safety Relevant Applications
Background & Objectives
Newly established satellite-based localisation systems (GNSS) promise ever-increasing accuracy in accomplishing challenging localisation tasks in transportation. In particular, safety-relevant applications will become possible if localisation services are capable of determining vehicle position in an accurate and dependable manner. GNSS-based vehicle localisation is one of the most important preconditions for the realisation of these new features.
Why this project is important for EGNOS/GSA/SatNav?
The specifications of a reference system and representative test scenarios have to be standardised in order to attain comparable test results.
Objectives
QualiSaR aims at the development of a qualification procedure for receivers of satellite-based localisation systems. The basis for an internationally accepted qualification procedure is a harmonised and consistent terminology in line with existing metrological standards. The terminology is to be used for specifying representative test scenarios and requirements for a reference system. The reference system has to be able to provide a satellite-independent vehicle position under varying conditions. Summing up, the main objective of a standardised qualification procedure for Galileo capable receivers can be divided into three subordinated objectives:
- Unified term structure describing the qualitative properties of satellite-based localisation
- Representative test scenarios and a reference system for the quantitative assessment of GNSS receivers
- Proposal for a standardised qualification procedure.
How does it work?
The basic idea for obtaining unambiguous terminology is not only to identify and define the relevant terms but also to ascertain the relations between them. A software simulator needs to be developed to estimate GNSS measurement quality. To perform these test scenarios under real-life conditions, a reference system has to be developed that is independent from the satellite-based localisation system.
Next Steps
- Development of test scenarios
- Development of a reference system
- Establishment of contacts with standardisation groups.
Work performed & results
One result will be a systematic method for designing test scenarios by a categorisation that considers the relevant influences on localisation. This will lead to a software package which can be used beyond QualiSaR’s timescale by the scientific and application-related community. The second result will consist of methods for evaluating the measured data by means of stochastic processes in order to regard the dynamic properties of the measurements.
A further result will be a technical specification of the mobile reference system. This is a requirement to manufacture and supply the required components. The reference system will be the carrier for the satellite-based localisation system being tested as well as the reference localisation system. The second result will be specifications for reference tracks which allow choosing specific urban and mountainous tracks for test runs.
