EGNOS and WAAS are two instances of the ICAO Space Based Augmentation System or SBAS. But the next generation SBAS, based on dual frequency, multiconstellation (DFMC) technology, looks set to drive future IFR navigation systems. Andrew Andersen reports.
20 years ago, the first instrument approaches based on the FAA’s Wide Area Augmentation System (WAAS) were flown.
A few years later, EGNOS was implemented, enabling vertical guidance across the continental Europe.
Today, the Localiser Performance with Vertical Guidance, or LPV approach, has become the first choice for GA pilots in North America when the weather precludes a visual approach.
At the time of writing, the FAA has published 4,127 LPV approach procedures at 2,004 airports; Canada has 772 LPV procedures; and Europe has 777.
Since 1935, massive volumes of technical study,…