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"Ground Control Staff" means "The people, computers, and other machines on the ground that helps to control a spacecraft or taxiways".

In a spacecraft or aircraft, it is a system to communicate with the management through a series of radio signals consisting of accurate measurements. it is usually used to help the pilot make a completely blind landing in case of any dangers like a rainstorm or a cloudy weather during which flying a plane and landings are especially extremely risky.