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Non-Gaussian Error Modeling for GBAS Integrity Assessment

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6 Author(s)
Dautermann, T. ; Deutsches Zentrum fur Luft-und Raumfahrt, Inst. fur Kommun. und Navig., Wessling, Germany ; Mayer, C. ; Antreich, F. ; Konovaltsev, A.
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Four basic error sources exist for residual pseudo-range errors in a single frequency differential GPS system for ground based augmentation (GBAS): signal multipath, increased receiver noise (carrier-to-noise density ratios (C/N0)) due to interference, residual differential troposphere error, and the error induced by ionosphere gradients. Without restricting ourselves to classical Gaussian overbounding, we combine their probability density functions (pdfs) to a total pseudo-range error distribution. This distribution is propagated through the GBAS Hatch filter and then mapped into the position domain using a worst case (selected by maximum vertical dilution of precision (VDOP)) of a full 31 satellite constellation with the two most critical satellites failed observed at Braunschweig Airport, Germany. Our calculations yield a significant reduction amounting to 46% of the position domain error at the 1.5 × 10-7 integrity risk level when compared with the classical Gaussian overbounding approach.

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Aerospace and Electronic Systems, IEEE Transactions on  (Volume:48 ,  Issue: 1 )