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Satellite Navigation - WAAS - How It Works | Federal Aviation ...
The Wide Area Augmentation System (WAAS) is an air navigation aid developed by the Federal Aviation Administration to augment the Global Positioning System (GPS), with the goal of improving its accuracy, integrity, and availability.
WAAS is the the U.S. implementation of SBAS (Satellite-Based Augmentation System). Here's how it works: Signals from the GPS satellite constellation are monitored by WAAS ground-based stations, to determine satellite clock and position corrections.
Understanding the Wide Area Augmentation System (WAAS) helps pilots see how corrected GPS signals support more accurate navigation and enable advanced instrument approach capabilities. Unlike traditional ground-based navigation aids, WAAS will cover a more extensive service area.
WAAS provides service for all classes of aircraft in all phases of flight - including enroute navigation, airport departures, and airport arrivals. This includes vertically guided landing approaches that can be used in Instrument Meteorological Conditions (IMC).
Two of the most important augmentation systems used in aviation today are WAAS (Wide Area Augmentation System) and LAAS/GBAS (Local Area Augmentation System / Ground-Based Augmentation System).
The Wide Area Augmentation System (WAAS), is the U.S. implementation of SBAS. SBAS combines core constellation satellites with Geo-stationary satellites and ground based reference stations to monitor satellite ranging errors.
The Wide Area Augmentation System (WAAS) system was designed to improve on your position accuracy, and is the US version of a Satellite Based Augmentation System (SBAS).
