This is a simple reader program that enables a commercial off-the-shelf (COTS) reader (Impinj SpeedWay R220, R420, etc.) to get multiple tags' infos (Received Signal Strength (RSS), Phase, Doppler Shift, etc.) with multiple antennas (up to 4) in real time.

The results are logged into a csv file, you can personalize the reader parameters by changing the source code.

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The GUI Version of TagDetection.

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Result:

This project was used to localize the position of antenna according its accumulated phases. For more details, please read the following publications.

• Wang J, Adib F, Knepper R, et al. Rf-compass: robot object manipulation using rfids[C]//Proceedings of the 19th annual international conference on Mobile computing & networking. ACM, 2013: 3-14. http://people.csail.mit.edu/rak/www/sites/default/files/pubs/WanEtal13.pdf
• Liu T, Yang L, Lin Q, et al. Anchor-free backscatter positioning for rfid tags with high accuracy[C]//INFOCOM, 2014 Proceedings IEEE. IEEE, 2014: 379-387. http://netlab.csu.edu.cn/infocom2014/papers/1569805925.pdf
• Han J, Qian C, Wang X, et al. Twins: Device-free object tracking using passive tags[C]//INFOCOM, 2014 Proceedings IEEE. IEEE, 2014: 469-476. http://netlab.csu.edu.cn/infocom2014/papers/1569799611.pdf

Result: