What`s new in GNSS Raw Measurements Task Force

26 June 2019, Prague

Martin Sunkevic, European GNSS Agency

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Third GNSS Raw Measurements Taskforce Workshop

The GNSS Raw Measurements Task Force aims to share knowledge and expertise on Android raw measurements and its use

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The Task Force has more than 100 members including public agencies, universities, research institutes and companies

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Founding MembersFull list available at: https://www.gsa.europa.eu/task-force-raw-measurements-members

What are the benefits/ main uses of GNSS raw measurements?

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Four main areas of use are enabled by GNSS raw measurements

A Task Force discussion forum was set up to share knowledge and provide technical support

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Take part of the forum at: http://rawmeasurementstaskforce.forums-free.com/

The database is accessible through Google docs at: https://docs.google.com/spreadsheets/d/1Li4aKf43eJipZGweWpEIRHaRgj4tSacZ9WNuPHObt88/copy

Through the measurements database, members can exchange datalogs and other relevant documents

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Signal-In-Space Accuracy (SISA) consultation• Three questions on usage of SISA and SIS status flags contained within

the navigation messages to be provided after the workshop via email

• Replies expected by the end of this week, i.e. Friday 28 of June

1. Do your receivers use the SIS flags as the mean for determining the SIS status of satellite according to Table 7 in Galileo OS SDD Is.1.0 2016?

2. In case you use SISA, do you use it for other purposes different than checking SISA Index=255, that is SISA=NAPA to assess the SIS health status?

3. In case the definition of the SISA value would be modified, in order to support ARAIM as a User Range Accuracy parameter, would it impact your receiver or application? If so, which impact?

Linking space to user needs

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How to get in touch: www.GSA.europa.eu

GSC-europa.euEGNOS-portal.eu UseGalileo.euG

What are the benefits/ main uses of GNSS raw measurements?

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Four main areas of use are enabled by GNSS raw measurements

• Subject to hardware limitations, access to raw measurements means a developer can employ advanced positioning techniques (RTK, PPP) and create a solution currently only available in professional receivers.• It results in a technological push to develop new applications.

• As the observations are provided in a much more coarse form they can be used for testing hardware and software solutions and for new post processing algorithms e.g. for modelling ionosphere or troposphere.

• Access to raw measurements will offer new ways to detect RF interferences and to locate the interference source by combining the measurements from multiple devices (crowdsourcing), or verify the source (OS-NMA). • SBAS corrections can be incorporated without the need for additional equipment.

• Raw measurements can be used for monitoring performance (data, accuracy, Rx clock), testing and to compare solution from single constellations, eliminate specific satellites or test for worst scenario performance. • Education use for understanding GNSS, Signal processing or orbits in smartphone is not negligible too.