American Radar Shoes Can Be Positioned Accurately In The Blind Area Of GPS Signal.

　　 GPS The widespread popularity of equipment facilitates people's travel. However, in some special signal blind areas, GPS still finds it difficult to locate the target accurately. How to solve this problem has always been a research topic in the scientific field. It is reported that American researchers have invented a kind of radar shoe, which can help users locate precisely in the blind area of the signal.
　　
So far, the most commonly used method to locate blind spots in GPS signals is the use of inertial measurement unit (IMU). But because IMU needs to measure the speed and direction of the target according to the last GPS position of the target, then new positioning is made, so even a minor mistake in the measurement may cause a huge cumulative error. The longer the target loses GPS contact, the greater the error will be. IMU will even decide to stop moving target slowly.
　　
In view of this situation, U.S.A The joint research team of North Carolina State University and Carnegie Mellon University invented a radar shoe, which built a radar. The radar can track the distance between the foot and the ground. If the distance has not changed for a long time, the system will determine the target and stop the movement and spanmit the information to IMU. This improvement allows IMU to locate the target more accurately when the target stops moving.
　　
such radar Shoes are very useful for underground workers, especially those working in tunnels and large frame structures. They can be positioned accurately under dangerous conditions.