Performance Based Navigation
PBN baseline wording
PBN stands for Performance Based Navigation. GNSS (Global Navigation Satellite Systems), such as GPS, notably contribute to PBN requirements in both en route and terminal areas.
As part of DSNA PBN strategy and in particular for satellite based navigation, the following performance specifications have to be reached for each of the respective airspace areas :
|requires that the on-board equipment keeps lateral and longitudinal navigation accuracy on route of + 5 NM or better during at least 95% of the total flight time. It does not include requirements for on-board performance monitoring and alerting. The network based on the RNAV 5 specification (previously known as BRNAV in Europe) exists since 1998. To fly within the French airspace, RNAV 5 specification is required above FL 115.|
|requires lateral and longitudinal navigation accuracy of +1 NM or better during at least 95% of the total flight time. On board performance monitoring and alerting are not required. RNAV 1 trajectories (previously known as PRNAV in Europe) are now implemented within more than 75% of DSNA terminal areas.|
Three different types of approaches are supported by satellite systems. They are referred to as PBN approach procedures (published under the name RNAV(GNSS)) and require on board performance monitoring and alerting.
When monitoring and correction information of the PBN trajectory are needed, on board equipment will either use a Receiver Autonomous Integrity Monitoring (RAIM) or a Satellite Based Augmentation System (SBAS) such as EGNOS (European Geostationary Navigation Overlay Service) for Europe.
A SBAS increases the core GNSS constellation(s) by providing integrity, correction and GEO ranging information. Such systems are commonly composed of multiple ground stations, located at accurately-surveyed points. Click here to learn more about SBAS/EGNOS.
guidance trajectory to expect
|with GPS||lateral only||LNAV (Lateral NAVigation)|
|with GPS + Barometric||lateral & vertical
Vertical guidance being provided by an ABAS (Airborne Based Augmentation System) : a computer using barometric indications as reference, thus needing accurate and updated QNH information.
|LNAV/VNAV (Lateral NAVigation/Vertical NAVigation)|
|with SBAS||lateral & vertical
Vertical guidance being provided by a SBAS (Satellite Based Augmentation System) such as EGNOS (European Geostationary Navigation Overlay Service).
|LPV (Localiser Performance with Vertical guidance)|
Navigation specifications for approach operations (Ref : ICAO doc 9905) :
- Required Navigation Performance APproaCH (RNP APCH)
The RNP APCH navigation specification is intended to satisfy general RNP operational requirements and permit participation by aircraft with a basic level of RNP capability without a requirement for operational authorization.
- RNP Authorization Required approach (RNP AR APCH).
The RNP AR APCH navigation specification enables a higher level of navigation performance better able to address issues of airport access, such as obstacle-rich environments. It facilitate advances in air traffic management (ATM). It requires the operator to meet additional aircraft and aircrew requirements and obtain operational authorization from the State regulatory authority.