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DOD Tests, Buys New ISO 18000-7 Tags From Four Companies
After testing the new active 433 MHz tags for electromagnetic interference, the U.S. military has placed orders for the devices, which could cost half as much as their predecessors.
The tags were tested in a lab to simulate the environment in which they would operate—namely, helicopters, as well as large and small fixed-wing aircraft—to determine whether they met the requirements of the DOD Interface Standard 461F (an RF standard used by the U.S. military, according to Zentner). In theory, he says, a tag's power supply could generate RF noise. All of the vendors' tags now operate within the military's 461F specifications, though at least one model needed to be modified before it could pass the test. Helicopters are the greatest risk for this interference, he adds, since they have more apertures (openings through which RF transmissions could leak out) than other small or large aircraft.
Ultimately, Zentner says, the RFID hardware provided no interference concerns. "RFID devices seem fairly innocent," he states. The tests were undertaken in a metallic room without actual aircraft, and the tags were set to continually transmit. The researchers measured the electromagnetic fields that resulted.
The DOD and other government agencies use aircraft as a means of transporting RFID-tagged cargo. In the case of the 18000-7 tags, most will be utilized on shipping containers that would be transported by ocean, so few will actually be placed within an aircraft. However, the EMI certification indicates the tags can be safely transported by air, if necessary.
The switch to ISO 18000-7 hardware is opening up opportunities for the commercial use of active RFID technology for tracking supplies that will be transported to or by the military, says Patrick Burns, the president of the Dash7 Alliance, a coalition of 30 companies and organizations from multiple industries focused on supporting the adoption of the ISO 18000-7 standard. The alliance was launched this year, in part due to the DOD's plans for the RFID-III contract using ISO 18000-7 (see Dash7 Alliance Seeks to Promote RFID Hardware Based on ISO 18000-7 Standard).
The DOD has been an advisor to the alliance, helping the organization to develop testing and certification procedures for interoperability of the technology, as well as planning the next stages, including encryption plans and outreach work to publicize the active RFID standard. Products purchased by the DOD in this order have earned Dash7 1.0 Interoperability Certification, indicating they have successfully completed baseline interoperability testing for DOD-specific deployments.
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