Wide Area Augmentation System

Wide Area Augmentation System (WAAS)

Country/ies of originUnited States
Operator(s)FAA
StatusOperational
CoverageUnited States, Canada, Mexico
Accuracy1.0 metre (3.3 ft)[1]
Constellation size
Current usable satellites3
First launch2003; 21 years ago (2003)
Orbital characteristics
Regime(s)GEO (uses communication satellites)
WAAS system overview

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. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including precision approaches to any airport within its coverage area.[2] It may be further enhanced with the Local Area Augmentation System (LAAS) also known by the preferred ICAO term Ground-Based Augmentation System (GBAS) in critical areas.

WAAS uses a network of ground-based reference stations, in North America and Hawaii, to measure small variations in the GPS satellites' signals in the western hemisphere. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.

The International Civil Aviation Organization (ICAO) calls this type of system a satellite-based augmentation system (SBAS). Europe and Asia are developing their own SBASs: the Indian GPS Aided Geo Augmented Navigation (GAGAN), the European Geostationary Navigation Overlay Service (EGNOS), the Japanese Multi-functional Satellite Augmentation System (MSAS) and the Russian System for Differential Corrections and Monitoring (SDCM), respectively. Commercial systems include StarFire, OmniSTAR, and Atlas.

SBAS Service Areas
  1. ^ Cite error: The named reference WAAS_NSTB_PAN_Report_Jul06 was invoked but never defined (see the help page).
  2. ^ Federal Aviation Administration (FAA) FAQ for WAAS