HoughtonAssociates,Inc.developeda comprehensive set of modelsfor assessingthe cost andbenefitof GBAS installations including
Potential elimination of airport critical areas
Reduced maintenance and tech refresh costs
Staggered approach profiles
Closely spaced runways
Precise navigation performance
An example is the calculation of improved airport throughput due to staggered approaches and closely-spaced runways using the Approach Collision Probability Model (ACPM). GBAS provides multiple glide slopes at the same runway end and substantially reduced angular splay as a function of distance from the runway end. The trade-off is greater airport capacity against safety, with aircraft potentially closer together and wake vortex phenomena becoming more of a concern.