Multi-antenna RFID reader-writer

Abstract

The invention discloses a multi-antenna RFID reader-writer, and belongs to the field of RFID ultrahigh frequency reader-writers. The multi-antenna RFID reader-writer comprises a PDA terminal, a positioning module, an MCU processor, a high-frequency module, a radio frequency control unit and an antenna matrix. A plane-coordinate system is constructed through the antenna matrix, and all tag information read by the antenna matrix is sorted to form an information sorting table of each tag; after a target tag is selected, an antenna unit where the target tag is located is determined through an information sorting table of the target tag, three read-write antennas with the first three RSSI signal strength values of the target tag are determined, and then a unique target antenna unit can be determined; after the target antenna unit where the target tag is located is determined, six read-write antennas of the target antenna unit are measured and calculated through an LANDMARC algorithm, and the position of the target tag can be accurate. The method is wide in positioning range, low in missed reading rate and missed degree rate, and beneficial to market promotion.

Description

technical field [0001] The invention relates to the field of RFID ultra-high frequency reader-writers, and more specifically relates to a multi-antenna RFID reader-writer. Background technique [0002] In the scene application of managing files, items and other objects based on RFID technology, the location of these managed objects is the core function of the system. The key performance indicators that affect the positioning results are the cross-read rate and the miss-read rate. In actual use, due to the physical characteristics of RFID technology, when multiple tags have a high overlapping rate, are blocked, or the field strength distribution of the environment is uneven and cannot be stimulated, it is impossible to read all the target tags. Inventory, there is a high omission rate. At the same time, due to the field strength distribution characteristics of RFID antennas, the field strength distribution range of different antennas is different, and the strength is also d...

AI Technical Summary

Problems solved by technology

In actual use, due to the physical characteristics of RFID technology, when multiple tags have a high overlapping rate, are blocked, or the field strength distribution of the environment is uneven and cannot be stimulated, it is impossible to read all the target tags. Inventory, there is a high omission rate

At the same time, due to the field strength distribution characteristics of RFID antennas, the field strength distribution range of different antennas is different, and the strength is also different. On the one hand, the antenna needs to be optimized and screened from the information read multiple times when positioning, resulting in reading and writing. On the other hand, it is easy to read the surrounding tags when used in the actual environment, causing cross-reading

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