GPS-Galileo Working Group C
ARAIM Technical Subgroup
Milestone 3 Report

February 26, 2016

The U.S.-EU Agreement on GPS-Galileo Cooperation signed in 2004 established the principles for the cooperation activities between the United States of America and the European Union in the field of satellite navigation. The Agreement foresaw a working group to promote cooperation on the design and development of the next generation of civil satellite-based navigation and timing systems. This work became the focus of Working Group C (WG-C).

Working Group C (WG-C) is designed to enhance cooperation for next generation GNSS. One of the objectives of WG-C is to develop integrated applications for Safety-of-Life services. To this end, WG-C established the ARAIM Technical Subgroup. The objective of the Subgroup is to investigate ARAIM (Advanced Receiver Autonomous Integrity Monitoring). The further goal is to determine whether ARAIM can be the basis for a multi-constellation concept to support air navigation worldwide to enable lateral and vertical guidance during airport approach operations in addition to en route and terminal area flight.

The ARAIM consultations resulted in the public release of the following report, the third milestone in a three-phase effort:

Working Group C, ARAIM Technical Subgroup Milestone 3 Report (6 MB PDF)

Also available at:

The report documents the progress made in advancing the ARAIM concepts thanks to the collaborative work of the United States and the European Union and leveraging inputs from Air Navigation Service Providers, aviation industry and international standardization bodies regarding the general concepts, assumptions and preliminary findings presented in the phase 2 report.

WG-C and the ARAIM Technical Subgroup strive to build a consensus towards the future standardization of ARAIM at the international level.  To that end, the Milestone 3 Report includes a proposed Implementation Roadmap for ARAIM Services, the consideration of institutional issues and their discussion, as well as the elaborated view of ARAIM complementing the services provided by SBAS systems.

The report also identifies three main areas of work in which WG-C can continue to contribute for the period 2016-2018 including: contributions to standards development activities, prototype development and testing for ground and airborne algorithms, and constellation service providers' requirements development and compatibility coordination.

The United States and European Union remain focused on improving GNSS services through the development of both advanced receiver techniques and Satellite-Based Augmentation Systems (SBAS) for integrity monitoring and to improve GNSS navigation positioning, and timing services for all users worldwide.