Global Positioning System wide area augmentation system (WAAS) performance standard.
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Global Positioning System wide area augmentation system (WAAS) performance standard.

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  • Abstract:
    The U.S. Global Positioning System (GPS) Standard Positioning Service (SPS) consists of spacebased

    positioning, navigation, and timing (PNT) signals generated from space vehicles orbiting the

    earth and delivered free of direct user fees for civil, commercial, and scientific uses worldwide. The

    Wide Area Augmentation System (WAAS) provides an augmentation signal to GPS, delivered free

    of direct user fees, that provides correction and integrity information intended to improve

    positioning navigation and timing (PNT) service over the United States (U.S.) and portions of

    Canada and Mexico. WAAS is the first operational implementation of an International Civil Aviation

    Organization (ICAO) compliant Space Based augmentation System (SBAS). This WAAS

    Performance Standard (WAAS PS) specifies the levels of navigation performance that will be

    available to suitably equipped users who use both the GPS SPS broadcast signals and the WAAS

    augmentation signal. The U.S. Government is committed to meeting the minimum levels of service

    specified in this WAAS PS. Refer to the GPS SPS PS for specific information regarding the USG

    commitment for the GPS SPS.

    Since WAAS was commissioned in 2003, actual performance has typically met and exceeded the

    minimum accuracy, integrity, continuity, and availability performance requirements specified in this

    WAAS PS and users can therefore generally expect improved performance over the minimum

    levels described here. Actual real-time performance, statistical performance and real-time data are

    provided on-line by the Federal Aviation Administration (FAA). Quarterly Performance Analysis

    Reports for both GPS and WAAS are also available at the FAA Technical Center WAAS Test Bed

    web site ( Interested readers are encouraged to refer to this site and

    other sources for updated GPS and WAAS performance information. Note that the number of

    WAAS-based Localizer Performance with Vertical (LPV) guidance procedures now exceeds the

    number of Instrument Landing System (ILS) procedures in the United States.

    GPS will provide three new modernized civil signals in the future: L2C, L5, and L1C. With the

    additional signal on L5, airborne receivers will be able to correct for the line of sight ionospheric

    propagation delay error. This dual frequency (L1/L5) mode of operation will allow changes to be

    made in the delivery of GPS-based augmentation services, such as WAAS, but this Performance

    Standard does not consider those future changes. This WAAS Performance Standard only applies

    to WAAS augmented GPS SPS users of the L1 (1575.42 MHz) Coarse/Acquisition (C/A) signal and

    the WAAS Signal-In-Space (SIS) broadcast by a geostationary satellite (GEO).

    The WAAS PS will be updated as required to reflect substantial changes to WAAS augmentation

    services. In addition to the WAAS PS, readers are referenced to the GPS SPS PS and FAA

    Technical Standard Order (TSO)-145/146 for details in both the fundamental GPS SPS service and

    WAAS receiver equipment. WAAS also meets or exceeds the ICAO Annex 10, Standards and

    Recommended Practices (SARPs) for Global Navigation Satellite System (GNSS) Satellite Based

    Augmentation System (SBAS).


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