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Time-Frequency Approach to Anti-Collision Signal Processing for RFID SAW Tags

Radio frequency identification tags (RFID) are widely used for industrial parts tracking in automated industries. Such sensors measuring physical quantities are especially required for high-tech production and testing methods of modern complex technical systems. The using of RFID system based on surface acoustic wave tags faces with collision problem. The collision of several response signals means that response signals are overlapping in the time domain. It makes identifying each of them difficult and in some cases impossible. It leads to incorrect identification and measurements. This paper considers the methods of avoiding collisions issues and their characteristics. This approach considered to be the most prospective in the case of using passive tags.