Integrated Navigation System-of-Systems PNT Integrity for Resilience

Register for the Final Presentation of the NAVISP EL3-020 Project: "Integrated Navigation System-of-Systems PNT Integrity for Resilience (INSPIRe)"

INSPIRe is a R&D project, investigating solutions to develop improved approaches for providing integrity of GNSS-derived Position Navigation and Timing (PNT) for the maritime communities at both the user- and systems-level. The project builds on work completed in MarRINav, a previous project which proposed a framework for a systems-of-systems approach for resilient PNT including integrity for maritime navigation. INSPIRe has developed and validated several integrity solutions for the maritime domain, considering different approaches to integrity measurement and GNSS PNT sources, with the aim to understand their feasibility and performance. The aim of this is to ensure that maritime PNT information is provided to the required level of integrity within the UK as part of an overall resilient PNT solution. 

The integrity concepts and results developed from INSPIRe have been used to identify future development pathways for integrating the project's results and novel integrity concepts into a system-of-systems integrity architecture, and to identify opportunities to exploit this in and beyond the maritime sector. 

 To deliver this project INSPIRe completed a state-of-the-art review of the current situation of integrity consolidating previous work on maritime integrity algorithms. Systems engineering developed high level requirements based on use cases and subsequent validation processes to ensure the relevance and integrability of the integrity concepts in a maritime environment. 

INSPIRe then developed and explored maturing implementations of user-level receiver algorithms for single frequency GPS and dual frequency multi-constellation GNSS integrity considering two maritime scenarios. The project has also developed a prototype RAIM availability prediction tool which enables the user to identify the expected integrity performance of their position based on location which predicts RAIM availability across the UK to the limits of the EEZ and further as time and effort permit. INSPIRe has also developed algorithms monitoring software at the system-level, comprising of EGNOS monitoring and DFMC integrity monitoring. A simple EGNOS monitor is proposed and the DFMC Integrity Monitoring (DIM) service proposed provides system level integrity assurance for maritime DFMC users in the UK European EEZ. All integrity concepts have then been verified by validating the performance and functionality results of the integrity solutions against the requirements to ensure that all solutions have potential to be brought together as a systems-of-systems integrity solution. Based off the outcomes and results of the developed integrity algorithms a cost benefit analysis was completed which considers use cases in the maritime domain which have been drawn from the systems engineering and stakeholder engagement workstreams. INSPIRe was finalised through development of an implementation & exploitation plan which consolidates the implementation requirements and roadmap for the user and system-level integrity concepts and the RAIM Performance Prediction tool. 

The project was delivered by Taylor Airey Limited (acting as prime contractor) with the support of, CGI UK Ltd, GMV NSL Ltd,  GLA Research and Development (GRAD), Imperial College London, NLA International Ltd, KTN (Knowledge Transfer Network Ltd) and London Economics acting as subcontractors. 

EL3-020“INSPIRE" was funded by NAVISP Element 3, which is dedicated to support participating States in their national PNT strategies, promoting the development and promotion of GNSS and PNT products.

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