Abstract
This paper discusses the concept of a system which enables simultaneous 3D multi-targets indoor localization by using CDMA for the TOF of ultrasonic signals. The system is designed for the so-called "Intelligent Space" where ultrasonic receivers are embedded in the space while emitters are tags contacted with targets to be localized. Emitted signals from each tag is assigned with a unique pseudorandom "Gold codes" so that even the tags emit signal simultaneously, receivers can detect them respectively. Since there are usually so many targets in the intelligent space to be localized at the same time that the sampling time of traditional ultrasonic localization is often too long to apply most real time control algorisms, this system is expected to speed up the overall localization sampling rate in the Intelligent Space.
