Abstract
In the Global Positioning System, there is no provision for real-time integrity information within the Standard Positioning Service, by design. However, in safety critical sectors like aviation, stringent integrity performance requirements must be met. This can be achieved using the special augmentation systems or RAIM (Receiver Autonomous Integrity Monitoring) or both. RAIM, the most cost-effective method relies on data consistency, and therefore requires redundant measurements for its operation. An external aid to provide this redundancy can be in the form of an Inertial Navigation system. This should enable continued performance even when no redundant satellite measurements are available. An algorithm presented in previous papers by the authors detects the rate of slowly growing errors. The algorithm was shown to be effective for early detection of slowly growing errors that belong to the class of most difficult to detect errors. Firstly, rate detector is tested for varying faults. Secondly, real data are used to validate the rate detector algorithm. The data are extensively analyzed to ascertain whether it is suitable for integrity and fault diagnostics. A modification to the original rate detector algorithm is suggested by addition of a bias state to the dynamic model. The performance is then compared with the existing techniques and substantial improvement is shown.
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Acknowledgments
The authors acknowledges the financial support of Government of Pakistan, Imperial College London and Dr. Imran Iqbal Bhatti. The real GPS and INS data used in this paper was provided by the SPACE project- a consortium involving Imperial College London, the University of Nottingham, UCL an the University of Leeds. The assistance rendered by Dr. Chris Hide (IESSG, Nottingham) with data manipulation and simulation, in acknowledged.
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Bhatti, U.I., Ochieng, W.Y. & Feng, S. Performance of rate detector algorithms for an integrated GPS/INS system in the presence of slowly growing error. GPS Solut 16, 293–301 (2012). https://doi.org/10.1007/s10291-011-0231-y
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DOI: https://doi.org/10.1007/s10291-011-0231-y