GNSS Liability Critical Applications through the Provision of User-Level Integrity
- Paper number
IAC-06-B3.6.02
- Author
Ms. Audrey Mark, GMV S.A., Spain
- Coauthor
Mr. Miguel Ángel Martínez Olagüe, GMV S.A., Spain
- Coauthor
Mr. Joaquín Cosmen Schortmann, GMV S.A., Spain
- Year
2006
- Abstract
Satellite navigation technology is continually advancing new possibilities in an increasing number of sectors. A number of projects sponsored by the European Commission (e.g. GALA or GEMINUS) have led to the identification of more than one hundred conceivable applications for this technology. The unprecedented social, economic, technological and environmental benefits to be gained through these applications is apparent. The most basic limitation of the current GPS system is that it cannot provide a service guarantee in particular for what concerns integrity, which is indispensable for many new GNSS-based applications. Lack of these guarantees would nullify any confidence in the results and thus jeopardise the validity of these applications. Integrity plays a fundamental role in the feasibility of these “liability critical” applications – applications where GNSS performance problems can generate significant legal or economic consequences (or liabilities) when not identified. Road charging, for example, e.g. tolling in urban zones or on highways, represents a series of liability critical applications where a guarantee in integrity could be a true enabler: being the mechanism that prevents the incorrect charging of users and enabling the advancement of these applications using GNSS such as Galileo and EGNOS that provide integrity mechanisms. Unfortunately, the EGNOS and Galileo integrity services do not cover all links in the integrity chain required to successfully implement liability critical applications. In principle, no kind of guarantee of the performance attainable at the user level is possible since there can be no control over aspects such as the reception quality of each individual signal, due to local effects such as multipath or interference, or the satellite visibility for each individual user. The consequence of this is that the integrity of the end user position is not guaranteed by the EGNOS and Galileo integrity services alone as provided. A newly developed road charging application was put to the test within a representative, large European city filled with urban canyons. In this city, multiple opportunities arose to test the system against the effects of a local, urban environment, including multipath, reflected signals, interference and reduced visibility in general. The objective of this paper is to present the results of the trials performed using the user-level integrity and road charging solutions that have been developed specifically for this type of application. Particular emphasis will be placed on the performances obtained with the full integrity provision chain and the results obtained with the road charging application.
- Abstract document
- Manuscript document
IAC-06-B3.6.02.pdf (🔒 authorized access only).
To get the manuscript, please contact IAF Secretariat.