Widebody; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2
Conflict Ground Conflict; Critical; Ground Incursion Runway
Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach
Aircraft; Procedure
I issued Aircraft X a clearance to land Runway 25. Ground taxied Aircraft Y to Runway 25 via Taxiway J which is the approach end of the runway. Aircraft Y did not have permission from ground for access to Runway 25 and was not given any permission by me to access Runway 25. When Aircraft X was within a half mile of the threshold; Aircraft Y crossed the hold short lines to Runway 25. I told Aircraft X to go-around and kept Aircraft X in the local traffic pattern. After I got things under control with Aircraft X I reached out to Aircraft Y to see if he was on my frequency which he was and issued the brasher warning. Aircraft Y called the Tower and admitted fault in the situation.I want to be clear that this situation would have been a catastrophe if we were landing and departing Runway 7. The tower vantage point would not have allowed us to be able to quickly recognize that an aircraft entered the runway at the approach end for Runway 7. The tower is almost 2 miles away from the approach end of Runway 7 and is way too short for that. To prevent a catastrophe from happening I recommend a newer taller Tower be built in a better location so that all approach ends can easily be seen with the naked eye. This is the only way we will be able to safely do our job no matter what runway we advertise.
RFD Tower Controller reported a runway incursion that caused a go-around.