Hangzhou Ecived Electronics & Technology Co., Ltd, used Low-frequency electromagnetic wave technology to measure distance. The "positioning system of low-frequency electromagnetic waves" used the ranging ability to achieve spatial localization. The "Positioning system of low-frequency electromagnetic waves" consists of the following components: a base station, four low-frequency transmitter, several Tags. The l
ow-frequency electromagnetic waves with good "penetrating" and "interference immunity" applies to buildings within the multi-wall, and more obstacles complex environment.When people carry the tag into the targeted area, the system will be measured labels to the distance of four low-frequency transmitter, and get its spatial orientation.