Even the most excellent business, the inventory of tracking modern distribution warehouses is also a huge challenge. According to reports, US retailers have a total of more than $ 45 billion, so the technology that is easier to track inventory is likely to have a huge impact. A new system developed by the Massachusetts Institute of Technology can track inventory using small drones and RFID tags.
The Massachusetts Institute of Technology said that the biggest challenge to develop this drone is to find a safe approach. The only drone that can be flying near people is small, lightweight and have plastic rotor. Unfortunately, these drones cannot carry RFID readers that carry radio frequency.
The researchers did not rely on drones to carry readers, but developed a method of using drones as relays, allowing UAVs without developing new RFID tags, label readers or software. But this method is not a challenge.
The research team found that by transmitting a radio frequency recognition signal to determine the precise position of a commodity, a problem will occur in signal processing. The RF identification tag is wirelessly powered by the reader, which means that the transmitter and the label operating frequency are the same. There is also a frequency transfer between the relay and the RFID tag. The requirements of simultaneous transmission make mutual interference between the four channels.
However, the drone moves in constant movement, so the time of this process makes it unable to accurately record the location of an object. In order to avoid this problem, the researchers have developed an analog filter that can be separated by the label.
The MIT researchers said that the problem becomes worse due to its system to accurately locate the RFID tag. The positioning detection system traditionally uses an antenna array to calculate the source of the RFID signal, but the drone is too small and cannot be carried. The solution to this problem is simple: because it is constantly moving, the reading acquired at different times will be associated with different locations, basically simulates the role of traditional antenna arrays.
The researchers of the Massachusetts Institute of Technology have installed RFID tags for each drone. The drone is alternately transmitting between the signal of the marked item with its positioning signal, and issues its own signal to the reader, so that the system can calculate how much influence on the results of the drone, and Corrected it.
In a set of experiments, the average positioning error of this system is approximately 19 cm. Researchers will cooperate with a retailer in Massachusetts to conduct a second phase of the test.
Original link: https://www.eeboard.com/news/rfid-3/
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