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New Handheld RFID Reader Locates Tags Within Centimeters
AsReader's ASR-R250G reader, paired with a smartphone, employs software from RFLocus and can display the locations of tagged items in 3D from a range of about 10 meters.
Jan 17, 2017—
This month, RFID reader technology company AsReader, Inc. released a new handheld reader with a 10-meter (33-foot) read range. Using software from RFLocus enables the new reader's users to not only interrogate an ultrahigh-frequency (UHF) RFID tag, but identify in 3D where that tag is located in relation to the reader, within a matter of centimeters.
The ASR-R250G is designed to be small and low in cost, the company reports. The handheld employs Apple iPhone- or Android-based devices, connected to the reader, to enable operation with an app. The new product also comes with built-in AsTagFinder software co-developed by RFLocus and AsReader. The AsReader open-source and royalty-free software-development kit (SDK) enables users to build an app to operate on the reader's mobile device. Users can transmit data back to a server via the mobile device's Wi-Fi connectivity, or via a cellular connection, or collect the data locally, off the network, and synch upon rejoining the network.
AsReader, Inc. is based in Tustin, Calif., and is a subsidiary of parent company Asterisk, Inc., headquartered in Osaka, Japan. The ASR-R250G-23 reader operates in the United States bandwidths, while its European counterpart is the ASR-R250G-22 model. In the U.S. and European models, the 1-watt (30-dBm) power setting can also be lowered manually, or with automated logic to as low as 3-mW (5-dBm) when shorter read ranges are desired.
"AsReader has released a device that is nothing like conventional readers," says Gary Chen, RFLocus's co-founder and managing VP. Because it accommodates a smartphone, he explains, the new reader is designed to enable use with an app, making it less expensive and smaller than most traditional PDA readers, with greater functionality. Additionally, the devices are built to provide both bar-code and RFID reading capabilities.
Most standard handhelds use received signal strength indicator (RSSI) technology to identify where a tag may be located, Chen explains. RFLocus software, in concert with AsReader hardware, also utilizes this measurement, as well as time domain phase difference of arrival (TD-PDOA), which consists of collecting and analyzing the sequence of data points in successive order as a reader is moving, according to Hajime Kamiya, RFLocus's co-founder and CEO. This enables the reader to interrogate each tag nearly 1,000 times per second.
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