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(bron
http://www.aviationtoday.com/rw/training/specialty/Technology-Today-GBAS_33914.html )
Pilots flying a GBAS approach will require minimal training, since GLS approaches appear the same as legacy ILS approaches. Unlike a costly ILS system, one GBAS station can support 26 runway independent approaches, supplied in a digital broadcast on a single VHF frequency. Without RNP, GBAS can also provide curved path approaches and missed approaches as another feature called terminal area path, or TAPs. Since this technology is runway independent, it can be installed above ground, even on the roof of a building. GBAS stations are installed and operational in Sydney, Australia, Malaga, Spain, Frankfurt and Bremen, Germany, Guam, and later this year, Newark, N.J.
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http://www.anws.gov.tw/CNSATM/en/navi.html )
Augmentation systems can provide benefits to the air traffic system as follows:
a. Improved landing minima (Cat 1 for SBAS and CAT I or better for GBAS) at aerodromes currently equipped with only Non-Precision Approach (NPA) procedures.
b. Better service reliability with greater GNSS signal availability and integrity.
c. Increased consistency and predictability in aircraft tracking through guided approach and departure procedures and greater accuracy of aircraft navigation.
d. Optimized airways, arrival, and departure procedures that improve overall flight service efficiency, shorten flight time, consider environmental impacts and reduce airline operations costs.
e. Reduced implementation and maintenance costs due to the reduced number of ground navigation facilities required for instrument flight procedures.
the DFS plans to use GBAS landing systems in a gradual replacement programme for more expensive instrument landing systems (ILS).
(bron
http://www.atm-insight.com/paan10.html )
The approach procedure is available 23 n miles from touchdown (compared to 8-10 n miles for ILS approaches), and supports complex approaches including RNP operations and continuous descent arrivals. A single GBAS ground station supports multiple approaches for all runways at an airport, versus one ILS per runway end, reducing maintenance and acquisition cost.
Unlike conventional ILS, GBAS is not prone to bandwidth interference that can distort the signal. A large aircraft can interrupt the localizer signal, leading to longer in-trail spacing requirements which reduce capacity. Airservices says the more accurate digital GBAS signal will result in more efficient operations when handling the A380 and similar large aircraft. ILS also requires hold-short procedures close to active runways to keep departing aircraft from encroaching on the localizer signal. This can slow departure rates as aircraft require longer time to taxi into position.