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Energy-harvesting sensor nodes determine own location

Posted: 11 Sep 2015 ?? ?Print Version ?Bookmark and Share

Keywords:sensor nodes? Internet of Things? WISPs?

In this study, the researchers addressed two related networking issueshow to design sensors that can determine their position and pose, how to reduce the amount of data that needs to be transmitted over the network and how to better manage the small amount of power that their RF antennas capture.

The researchers used an image processing technique called Perspective-n-Point (PnP) to determine location and pose. This involves capturing an image of an object and then comparing it with a second image in which four LEDs in a known configuration illuminate the object. Using this technique, the cameras were able to estimate their position to within a few centimetres. In their experimental setup, the researchers used four WISPCams and a separate WISP with LEDs, but Sample noted that the LEDs could be incorporated into each WISPCam.

Rather than send all of these images to a central computera laborious chore in networks that might include hundreds or thousands of camera sensors and one that would place great demands on the low-power devicesthe researchers showed that innovative circuitry and firmware enabled the initial processing necessary for localisation to be performed on-board each sensor.

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