Galileo Open Service SIS ICD: New version 1.2 released

30/11/2015

The European Commission has published a new release 1.2 of the Galileo Open Service Signal In Space Interface Control Document (OS SIS ICD v1.2). The document provides the information needed by receiver and chipset manufacturers, application developers and service providers to process and make use of the open signals generated by the Galileo satellites.

The OS SIS ICD contains the publicly available information on the Galileo Open ServiceThe latest version of the OS SIS ICD is based on feedback from receiver manufacturers and other stakeholders. Signal In Space, specifying the interface between the Galileo space and user segments. The Galileo user segment is of particular interest to the European GNSS Agency (GSA), which has been delegated responsibility for the programme’s service provision by the European Commission. In fulfilment of this role, the GSA is well advanced in developing the European GNSS Service Centre (GSC), which provides the single interface for information and help to users of the Galileo Open Service (OS). Once fully developed, the GSC will operate on a 24/7 basis and offer a range of services, including hosting the Galileo User Helpdesk, providing the interfaces between the Galileo System and OS users and hosting a centre of expertise for OS service aspects. 

The OS SIS ICD is a key document as it provides the information required by receiver and chipset manufacturers, application developers and service providers to be able to process the Open Service signals generated by the Galileo satellites. In particular, the document specifies:

  • Galileo signal characteristics
  • Characteristics of Galileo spreading codes
  • Galileo message structure
  • Message data contents

The latest version is based on feedback from receiver manufacturers and other stakeholders received during an extensive public consultation in 2014.

The GSA further highlights the importance of this document for the development of receiver technology, which is the key enabler for translating Galileo signals into useful services. Over the past several years, the GSA has been engaged in open dialogue with chipset and receiver manufacturers, paving the way for Galileo to be fully integrated into a new generation of receivers and ensuring its signals will provide a wide array of new applications and services that directly benefit European citizens.

The Details

In addition to a number of minor editorial improvements including corrections and clarifications, an annex with numerical examples of FEC coding and interleaving has been added and the licence agreement has been revised and simplified. The document now refers to a companion document, "Ionospheric Correction Algorithm for Galileo Single Frequency Users", containing details on the ionospheric model used for Galileo. The E1-B, E1-C and E5 Primary Codes in Annex C are no longer included in the paper version, but are available in the electronic version of the ICD.

The Galileo OS SIS ICD v1.2 document can be downloaded here.

The Ionospheric Correction Algorithm for Galileo Single Frequency Users document can be downloaded here.

Paper copies are available on request by contacting the European Commission grow-galileo@ec.europa.eu.

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