The following list of Questions and Answers has been compiled to provide quick guidance on GSTI features and characterization of the tools included.  

What is the GSTI?

The European GNSS Simulation and Testing Tools Infrastructure (GSTI) is a collaborative platform intended to support both developers of GNSS applications and equipment and providers of GNSS testing and simulation tools or testbeds.
It is an initiative launched by the European Commission , transferred to the European GNSS Service Centre (GSC) and available through the GSC web portal.


What are the services offered by the GSTI portal?

The GSTI Web Service provides an up-to-date database of the available GNSS simulation tools and testbeds and support for GNSS devices/applications developers.


Which kind of information is available in the tools database?

Every tool available in the GSTI provides technical information (category of the tool, supported GNSS signals and frequencies, environment of use, target users) as well as access conditions (e.g. commercial purchase, renting or free access) and point of contact. Links to the tool provider’s website and datasheets are also included when available.


Who can access to the GSTI Web portal?

The GSTI is available free of charge to any interested user and is offered on a non-discriminatory basis.


How can I get my tools registered in the GSTI?

You need to register yourself and your company using the GSC Helpdesk Contact Form and send a request stating that you want to include a new tool (or modify/remove if you have already available tools). In particular, fill the following fields in as:
[Market]: Other
[Subject]: <New/Modify/Remove> tool
[Question Type]: GSTI
The GSC team will provide you with a template with all the fields required for the tool and further indications, if needed. Please, note that all new information needs to be validated by GSC team before being listed among all the available tools.


How to use the database of tools?

The GSTI tools database is available to all interested users under the “Support to Developers” Menu. Moreover, users can access particular features to find tool(s) corresponding to their needs:

  • Search by Name: You can specify the tool name you are looking for.
  • Search by Category: You can select the category of the tool from a given list (e.g. Software Receiver).
  • Free text search: You can specify the key characteristics, features, or name of the tool you are looking for.
  • Search by GNSS Signal: You can select the compatible GNSS services given from a list (e.g. GPS (SPS)).
  • Search by Location: You can search the tool according to where is located (Country, City);
  • Advanced Search: You can specify the values of other targeted tool parameters.


What is a RF Signal Generator?

A RF GNSS Signal Generator (or simulator) is equipment recreating the RF signal(s) broadcasted by satellite(s). RF GNSS Signal Generators can simulate several type of environment faced by GNSS receivers such as multipath, urban canyon,... One of the main objectives of such tools is to enable the testing of the whole GNSS receiver’s chain in the laboratory.


What is a software (SW) signal generator?

A signal generator is a software tool capable of simulating or modelling:

  • GNSS signals,
  • GNSS signals propagation and corresponding environmental effects (ionosphere, troposphere, multipath, Doppler, etc.)
  • GNSS signals processing by a configurable GNSS receiver.

Software Signal Generator is useful for testing GNSS receiver algorithm during the design phases.


What is a GNSS Field test bed?

A GNSS Field test bed is a ground-based infrastructure enabling the test of GNSS equipment (receivers, antennas etc.) or applications under representative real field conditions.


What is a software (SW) receiver?

A software receiver is a software tool potentially supported by hardware, simulating the behaviour of a GNSS receiver. Various parameters may be included to modify GNSS signals processed, algorithms implemented, etc. GNSS signals used at the input of these tools may take different forms, and can be considered at different level of the signal processing chain. These inputs may come from various sources (software generated; real digitalized GNSS signals, real time processed thanks to hardware front-end equipment etc.).


What is a signal recorder?

A GNSS Signals recorder is an equipment or facility dedicated to the acquisition and storage of real GNSS signals for later use during the testing procedures.


What is a signal propagation simulator?

A signal propagation simulator is a tool simulating wave propagation (including reflexion, absorption, interferences…) in a modelling environment. This kind of tool is used to validate or design the algorithms used to mitigate the impact of environment at local (receiver) level.


What is a service volume simulator?

A GNSS service volume simulator is a tool or facility dedicated to the simulation and/or evaluation of performances achieved by GNSS constellations. Constellation simulation refers to satellite constellation definition and modelling. Performances to be assessed may include: service volume, DOP calculation, orbital parameters, time accuracy, ionosphere, troposphere, integrity, precision, etc.


What is a test bench for receivers?

Test bench tools are dedicated to the evaluation and benchmarking of receivers against performance criteria. They can be used during validation and quality control.


What is a Hardware receiver or front-end?

Hardware receiver is a whole GNSS receiver. Front-end is only the RF part of a GNSS receiver. This kind of equipment is useful to develop GNSS based application.


Updated: Dec 20, 2016