NIST: Conflicting Signals Can Confuse Rescue Robots
April 9, 2007 // Published as a news service by IHS
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Prototypes and commercial models of sensor-laden urban search and rescue (US&R) robots will soon begin to work rubble piles across the country.
Too many of these lifesaving robots in one location, however, could be problematic, according to researchers at the National Institute of Standards and Technology (NIST), who report that the radio transmissions of multiple robots can interfere with each other and degrade search and rescue performance.
A NIST analysis of wireless radio field trials for US&R robots, presented at the International Symposium on Advanced Radio Technologies in February, found that 10 out of the 14 robots tested experienced communication problems due to radio interference from other systems.
Engineers carried out tests on the robots in August 2006 at a US&R robot standards development gathering in Gaithersburg, Md., sponsored by the U.S. Department of Homeland Security (DHS). Researchers found that neither use of "industrial, scientific and medical" (ISM) frequency bands nor adherence to protocols designed to minimize interference between systems in the bands could guarantee flawless communication between a robot and its human operator.
Radio interference could happen whenever the ISM frequency bands became crowded or when one user had a much higher output power than the others. An example of the latter occurred during the tests when transmitters in the 1760 MHz band knocked out video links in the 2.4 GHz frequency band. In another case, a robot using an 802.11b signal in the 2.4 GHz band overwhelmed and cut off a robot that had been transmitting an analog video link at 2.414 GHz.
Researchers list a number of ways to improve US&R wireless communications. Options, some of which are being investigated by robot manufacturers, include changes in frequency coordination, transmission protocols, power output, access priority and using relay transformers to increase the range of wireless transmissions (a technique known as multi-hop communications). They also suggest establishing new access schemes or software-defined radios that allow interoperable communications.
The August 2006 US&R DHS/NIST robot exercise at the Montgomery County Fire Academy in Gaithersburg offered emergency responders an opportunity to deploy robots in realistic training scenarios, and helped robot developers and manufacturers refine designs and better understand performance requirements.
The work is funded by the DHS Science and Technology Directorate through NIST's Office of Law Enforcement Standards.
Source: National Institute of Standards and Technology (NIST).