Abstract
We show the results of the implementation of a preliminary algorithm for excluding ionospherically unsafe satellite geometries in Ground-Based Augmentation Systems Category I. Minimum knowledge of the ionospheric threat model is assumed and the assistance of the code-carrier divergence monitor is not considered. All the satellites in view above \(5^{\circ }\) in elevation are included in the computations. The inflation of the standard deviation of the vertical ionospheric gradient implements the exclusion. Full availability remains for a typical day in the site of La Plata Airport.
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Notes
- 1.
The four paramenters are: spatial gradient, front moving speed, width and maximum delay [11].
- 2.
The minimum number of satellites to be used by the airborne is four.
- 3.
A less constrained expression for IEV is presented in [22].
- 4.
A contant velocity of 0.07 km/s is assumed during the approach. The time constant of the carrier-smothing filter is \(\tau \) = 100 s.
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Bria, O., Giacomantone, J., Lorenti, L. (2018). Excluding Ionospherically Unsafe Satellite Geometries in GBAS CAT-I. In: De Giusti, A. (eds) Computer Science – CACIC 2017. CACIC 2017. Communications in Computer and Information Science, vol 790. Springer, Cham. https://doi.org/10.1007/978-3-319-75214-3_23
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