Colorado WAM separations standards targets of opportunity and flight test analysis
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Colorado WAM separations standards targets of opportunity and flight test analysis

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  • Alternative Title:
    28th Digital Avionics Systems Conference
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  • Abstract:
    The Federal Aviation Administration (FAA)

    Surveillance and Broadcast Services (SBS) Program

    Office and the Colorado Department of

    Transportation are implementing Wide Area

    Multilateration (WAM) in Non-Radar Airspace

    (NRA) to improve air traffic services at and around

    routes and fixes that support operations at

    Hayden/Yampa Valley (HDN), Craig-Moffat (CAG),

    Steamboat Springs/Bob Adams Field (SBS), and

    Garfield County Regional - Rifle (RIL) airports. In

    particular, the lack of comprehensive radar

    surveillance at and below 10,000 ft. in these regions

    requires controllers to use procedural separation

    standards for the Instrument Flight Rules (IFR)

    arriving/departing aircraft. While this is a safe means

    of providing service, it is inefficient for current traffic

    and especially for expected demand growth.

    Wide Area Multilateration is a distributed

    surveillance technology that utilizes a constellation of

    ground stations to provide surveillance coverage

    within a defined region. This technology makes use

    of signals transmitted from Air Traffic Control Radio

    Beacon System (ATCRBS) (Modes A and C) and

    Mode S transponders, in response to interrogations.

    The Mode S transponders also provide the squitter

    message once per second.

    The implementation, certification, and

    commissioning of WAM would enable air traffic

    controllers to apply more efficient separation

    standards for aircraft operating in the affected

    airspaces. For this operational environment, with

    WAM as the surveillance technology, the FAA seeks

    to achieve 5 NMI lateral/longitudinal separations.

    This paper describes the technical results from

    the data modeling, controlled flight test, and targets

    of opportunity analysis for the WAM sensor

    constellations near HDN and RIL to support

    separation standards within the Host Computer

    System (HCS) automation platform environment at

    Denver Center (ZDV). Comparative analysis was

    conducted between WAM and Secondary

    Surveillance Radar (SSR) to evaluate and validate

    WAM performance to support separation services.

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