SSG 1.182 Objectives

The goal of SSG 1.182 is to study GNSS multipath detection and mitigation techniques with the aim of improving existing high precision positioning accuracies. In the context of this SSG, multipath is loosely defined as the systematic errors in raw GNSS observations that are due to any signal scattering effect caused by the local environment surrounding an antenna. Furthermore, this SSG will focus on carrier phase and code-based multipath in terms of effects on receiver operation for high precision applications. Finally, within the scope of the group, the term GNSS is defined to encompass any type of global positioning system (for example, GPS, GLONASS-GPS and Galileo-GPS), or systems simulating GNSS signals (such as in the case of pseudolites).

Objectives:

• Evaluate and compare existing and developing algorithms and techniques for multipath detection and mitigation.
• Quantify and document the effectiveness of commercial receiver-based multipath mitigation techniques for high precision positioning.
• Investigate and document the properties of multipath in a variety of environments (particularly high risk environments).
• Provide information and guidelines for multipath detection and elimination for high precision applications.

These objectives will be achieved by:

• Initiating discussion between SSG members.
• Setting up a SSG website providing a focus for multipath research with links to member's websites.
• Providing a comprehensive reference list for multipath studies.
• Creating a set of standardised multipath data sets to allow comparison between mitigation and detection methods.
• Setting up a digital library containing all pertinent information on multipath detection and mitigation techniques and technologies.

The outcome of these activities will be summarised in a final report containing classification of detection and mitigation techniques, a library of results from different environments and receivers, and a set of recommendations giving information on multipath detection and mitigation.

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