Inside GNSS Media & Research

SEP-OCT 2018

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Page 44 of 67 S E P T E M B E R / O C T O B E R 2 0 1 8 Inside GNSS 45 Performance Figures of Merit Although users are ultimately inter- ested in their final positioning perfor- mance, i.e., how accurately a GNSS can pinpoint them on a map, for the GNSS service providers a direct commitment in the position domain remains the most challenging. An interesting anal- ogy is provided in the GPS Standard Positioning Service (SPS) Performance Standard. e GNSS system is compared to an electricity provider that can only commit to the level of performance its interface is able to provide, for example, in terms of voltage and frequency at the socket output. e users will then decide how to toast their bread or which pro- gram to set for their washing machines. Similarly, the GNSS can only control and commit on the errors that origi- nate from the system itself, therefore excluding local receiver effects such as multipath and interference, as well as propagation effects, despite the fact that these can contribute significantly to the final user solution. is is the rationale for the deriva- tion of a set of performance figures of merit conveying only the system driv- en performance, as outlined in Table FIGURE 2 Time and Geodetic Validation Facility (TGVF) overall architecture GALILEO IOV/FOC SIS GALILEO IOV/FOC S-Band FIGURE 3 Galileo System Evaluation Equipment (GALSEE) Elements and Architecture

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