Classical passive locating systems operate with a mesh of transmitters and unilateral reception, as GPS, GLONASS, Galileo positioning system and GSM cellnet locating. Further development has led to cooperative systems, where both positions are equipped with respective apparatus and thus provide bilateral measuring.
Metering results are obtained from ranging. The condition for unambiguousness on a line is 2 meterings, in a plane 3 meterings and in a space 4 meterings.
Obtaining locations in real time, i.e. with no delay between appearance in a location and availability of knowledge about the very same location, is Real Time Locating.
A locating engine is a computing construct that enables the computing of proper coordinates of objects in real time locating from noised-disturbed and motion-biased sets of longitudinal data.