Table 3 Relationship among PE, PL, and AL
From: Estimation method of SBAS dual-frequency range error integrity parameter
Relationship | Service state | Affect |
|---|---|---|
PE ≤ PL ≤ AL | Available | None |
PL < PE ≤ AL | Misleading information (MI) | Integrity risk |
AL < PL < PE | MI | Integrity risk |
PL < AL < PE | Hazardous MI (HMI) | Integrity risk Flight safety is in danger |
PE < AL < PL | Unavailable | Alarm |