Article published on juin 2008Positioning
LPS tracks objects under the 1/10 bar
CEA has patented a local positioning system (LPS) that can be used to detect an object in a closed, obstructed and adverse environment, with a precision of 100 micrometres.
While very useful for detecting objec t s in na t ur e, GP S falls short when precise measurements inside a building are required. To fill this gap, researchers at CEA's Military Applications Division developed and patented a local positioning system (LPS) using microwaves, intended to replace or complement traditional laser positioning.
Measuring changes in real time
The basic principle is to set up a network of emitting and receiving antennas in the building containing the object to be monitored, also equipped with an antenna. Tests conducted in the 2-4 GHz range have shown that changes in the relative difference between source and receiver could be measured in real time with a precision of around 100 micrometres, independently of the distance separating the antennas. LPS offers several advantages. First, as it lacks electronic components, it is insensitive to all forms of intense radiation. It is also capable of precise 3-D positioning and, depending on technological progress, the cables may one day be replaced by radio links.LPS has potential applications in all closed, obstructed and adverse environments: experimental rooms containing equipment to be positioned; erection, assembly or storage facilities.
