CLEAN : Robotics: Vienna hosts biggest European contest this weekend

The video tutorial discusses various topics, starting with an introduction and context setting. It then provides an overview of a technology system, focusing on its compatibility. The tutorial explains an ultrasonic GPS system that operates indoors without satellite reliance. Finally, it details a robot competition where robots use sensors and sharp blades to compete, with the goal of pushing the opponent out of the ring.

What challenges are mentioned regarding the traditional GPS system?

Describe the mechanism by which the robot's blade operates.