Unlike GPS satellite, this equipment can be introduced in designated spot on the earth where the GPS signal is weak.
Thus, this equipment transmits distance measuring ranging signals. And, reflected frequency and data signal has similar characteristics of GPS satellite signals.
However, to avoid intersection with GPS satellite, this equipment use GPS satellite code and Pseudo Random Noise, complementing GPS satellite and enhancing the exactness of altitude and distance.
- In Theme Park and Subway, to identify exact location
- In airports, when leading landing of airplane through extant identification.
- In large warehouse and industry complex, to identify location of equipment and appliances
- In mountain area, to identify exact location in the emergency and in the war.