Parameters for HPL Computation
| Parameter | Description |
|---|---|
| PHMI | Integrity risk for each sub-phase of surface movement shown in Table 1 |
| Psat, rsat | Prior probability of a satellite fault and the fault rate |
| GPS: Psat = 10−5, rsat = 10−5 / h (ICAO, 2018) | |
| Galileo: Psat = 3 × 10−5 (Wallner et al., 2021), rsat =[3 × 10−5, 10−5] / h | |
| Pconst | Prior probability of a fault affecting more than one satellite in a constellation |
| GPS: 10−8/h (ICAO, 2018), Galileo: 2 × 10−4/h (Wallner et al., 2021) | |
| PThresh | Threshold for the integrity risk coming from unmonitored faults, set to the same value as the PHMI |
| PFA | Computed based on the continuity risk derived for each sub-phase of surface movement shown in Table 1 |