国外很牛的一家公司开发的超宽带定位系统，可实现二维三维定位-The Precision Location Ultra Wideband System (PLUS) is a highly accurate Real-Time Location System (RTLS) that enables enterprises to have precise location information on their people and assets. Using Ultra Wideband (UWB) technology, a PLUS network can provide indoor location information at sub-meter accuracy levels previously unavailable from WiFi or other RTLS technologies.