Question

What is the position accuracy that can be achieved by satellite guidance systems?

(a) 10 m

(b) 5 m

(c) 0.5 m

(d) 1 m

This question was posed to me in an interview.

The doubt is from ILS/MLS Coupled Landing System and Automatic Landing in portion Autopilots and Flight Management Systems of Avionics

Answer 1

The correct option is (d) 1 m

Best explanation: The navigation position accuracy of 1 m which can be achieved with the differential GPS technique is being exploited in the US for landing guidance with a system called the Ground Based Augmentation System, GBAS. The Ground Based Augmentation System, when installed at an airport, will be able to provide the high integrity and accurate guidance necessary for landing in Cat. III visibility conditions.