Position measurement Sample Clauses

Position measurement. The position of the PAT at the time of data acquisition is of interest for all concerned hot side processes. One solution for accurately determining the position of a sensor within a process can be through measurements of the propagation delay of radio signals between the sensor and a number of fixed reference nodes. In order to minimize the influence of reflected waves bounc- ing off objects in the environment around the sensor it is desirable to use as wide bandwidth as possible, as this makes it possible to resolve the direct signal from indirect signals with small differences in path length. On the other hand, wide bandwidths has traditionally corresponded to very high operating frequencies (in order to keep the fractional bandwidth small). However, recent developments in RF circuits and standards has enabled so-called ultra-wideband (UWB) positioning based wide bandwidth transmission at moderate frequencies. For this project we intend to investigate if IEEE 802.15.4-2011 based solutions can be applied to position measure- ments in industrial processes. The basis for this work will be the Decawave DW1000 [9] chipset that uses 1 GHz bandwidth channels in the 3.5-6.5 GHz frequency band to achieve better than 10 cm positioning accuracy. Another technology available for position determination is the use of low frequency magnetic field ”beacons”. The technique is based on measurement of the strength of the received magnetic in a transponder. One commercial use of the technology is to determine the position of wireless car keys in order to allow start of vehicle [10]. Another application is found in the tracking of el- xxxxx, disoriented people inside buildings. In these applications the target is not three dimensional positioning, but instead to determine if the transponder is in the vicinity of a single beacon, or, in between two. Applied in Disire, we plan to use three beacons to transmit ranging pulses. The transponder will be equipped with a three dimensional receiver chip, that makes the reception omnidirectional and independent on transponder orientation [11], [12]. The beacons will send at discrete time slots, with identification. At reception, the transponder measures the signal strength received by each beacon, and transmits the data back to overlying control system using traditional radio at 868 MHz or 2.4 GHz. Having data from three or more beacons will allow the determination of transponder position. The use of magnetic field holds the advantage...
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