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IntroductionBalogh’s BDG 1020 2.45 GHz semi passive tags enables high speed identification of vehicles and people. For vehicles, tags are placed behind the windshield using an easily attached clip. For personnel identification, these lightweight cards are worn by the user in a tag holder. The tag is composed of a rigid plastic credit card sized case containing a microwave antenna, a quartz crystal, an ASIC and a lithium battery. A polyester film hermetically seals the tag.
Operating principleElectromagnetic radiation characteristics in the 2.45 GHz frequency band allow high data transmission rates and directional antenna beams. Tag detection is therefore very rapid and relatively insensitive to environmental interference.
Tag contentsThe HyperX™ tag can be progammed many times. Its memory capacity is 180 bits or 30 alphanumeric characters. The first 18 bits are reserved for use as an integrator code. This ensures that tags from different integrators do not have identical codes. The remaining 162 bits are available to be programmed freely as desired (eg. as 27 6-bit characters). The integrator can therfore select the coding scheme best adapted to Customer requirements.
Operating modesThe HyperX™ tag can be read at a range of from a few cms to over 10 meters. By using microwave-based communication, data transmission times are short, from 2 to 8ms, depending on the data stored. The data is emitted in bursts which are continually generated by the tag's electronics. There are two burst modes :
- "NORMAL" mode, in which the time interval between bursts is random, lying between 75 and 130ms. Using this mode, a reader can identify 5 tags in less than a second - it’s ideal for personnel identification. - "FAST" mode, in which the time interval between bursts is very short and constant - 20ms. Using this mode, a vehicle-type reader can identify a tag-equipped vehicle travelling at speeds over 100Km/h.