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Surveillance

　

1.  Automatic Dependent Surveillance–Broadcast (ADS-B) System:

The new ATMS is required to have the capability to receive and process ADS-B data: the goal of an ADS-B program is to develop, test, and implement ADS-B capabilities in the Taipei FIR to coincide with the commissioning of the ATMS. ADS-B is a means by which aircraft, aerodrome vehicles, and other objects can automatically transmit and/or receive data, including identification, position, and other data as appropriate, in a broadcast mode via a data link. ADS-B can be used in the Taipei FIR to fill in the current radar coverage gaps (including on aerodrome surfaces, and not limited to Taoyuan), monitor aerodrome vehicles, enhance surveillance processing, align with ICAO Global ATM concepts, and allow for potential reduced future infrastructure costs. This can lead to safety, capacity, and efficiency benefits at a much reduced cost compared to current radar. An ADS-B Application is shown in Figure 1.

There are three elements to the implementation of ADS-B: ATMS integration, aircraft equipage, and ground station installation. As noted, the new ATMS will have the capability to receive and process ADS-B data. Aircraft 1090MHz ADS-B equipage in the Taipei FIR is increasing due to recent ACAS/TCAS and Mode S transponder upgrades, as well as Australia, US, and European proposed ADS-B mandates. Following the ICAO Asia Pacific recommendation, 1090MHz ADS-B is the chosen ADS-B link for Taipei FIR. Lastly, ADS-B ground stations certified for ATC surveillance services are now readily available.

Taipei FIR ADS-B implementation is a 5-year program, from January 2007 through December 2011, to achieve initial operational capability. This can be followed by incremental additional ground station installations to extend coverage as required and as domestic aircraft equipage allows.

The proposed ADS-B ground station installation strategy follows an incremental approach that balances operational requirements and aircraft equipage levels. This strategy is divided into the following four (4) areas, with corresponding coverage requirements and benefits:

a. International en-route

   Coverage requirement: above 20,000ft (two ADS-B sites)

   Benefits: international harmonization, enhanced surveillance processing, supplement/backup current

   radar, safer FIR boundary crossing, more efficient flight operations if applying reduced separation

   standards.

b. Domestic en-route

   Coverage requirement: down to minimum en-route altitudes, approximately 5,000 ft (six ADS-B

   sites)

   Benefits: reduced future infrastructure costs, enhanced surveillance processing,

   supplementation/backup to current radar, improved airline operational control.

c. Approach

   Coverage requirement: down to final approach fix, approximately 1,500 ft (nine Ground Broadcast

   Transceiver sites)

   Benefits: expanded surveillance coverage, enhanced surveillance processing,

   supplementation/backup to current radar, increased safety with enhanced VFR flight following,

   improved airline operational control.

d. Aerodrome surface

   Coverage requirement: on the surface at aerodromes with ten (10) or more scheduled daily flights

   (10 to 12 ADS-B sites)

   Benefits: safer and more efficient ground movement, augmentation of ASDE at Taiwan Taoyuan

   International Aerodrome, runway incursion/excursion surveillance at other aerodromes

 


image

Figure 1 ADS-B Application

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