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Turtle Mike Technology Bridges Communications Systems

Release Date: November 13, 2014

In the midst of an emergency, communication is critical. The Department of Homeland Security (DHS) Science and Technology Directorate (S&T) is working to keep lines of communication between multiple responding organizations in order to communicate simultaneously and coordinate victim care, prevent further injuries and ensure available resources. Recent two-week field tests in Nebraska of the Hybrid Public Safety Microphone—or Turtle Mike—allowed law enforcement, medical, fire and rescue, and public works personnel to merge land mobile radio (LMR) and broadband systems so they were able to communicate with each other. Funded by S&T’s First Responders Group (FRG) at the request of DHS’s U.S. Customs and Border Protection, the Turtle Mike bridges offer a platform that links several different systems together.

FRG telecommunications specialist, Tom Chirhart, explained that during an emergency, first responders, medical teams, and other supporting elements use standard LMR radios, which have limited frequencies and bands, and augment them with smart devices using cellular broadband networks. As these LMR and broadband systems operate independently of each other, the Turtle Mike’s allow responders to create a teleconference platform that can be accessed by both of these systems.

“The Turtle Mike takes the conversation off the frequencies and bridges them together,” Chirhart said. “You can talk radio-to-radio or broadband-to-broadband or radio to broadband. It connects everyone together.”

The hardware solution can be added to any existing LMR system to provide access to cellular networks and the Turtle Mike app can be downloaded onto any smart device. The app allows first responders to access LMR channels and set up separate broadband conferences on cellular networks from their smart-phone device. These supplemental broadband conferences allow first responders to create unlimited separate conferences that can be tailored for each incident.

“If you have an incident, there are many different people who have to communicate at the same time on the same system. Turtle Mike allows direct contact easily between police, medical and fire responders and the hospital using different communications equipment; this is vital,” Chirhart stressed.

For instance, he explained, during an emergency, multiple response efforts occur happen simultaneously. At the onset of an event, onsite fire and law enforcement responders coordinate with hospitals and emergency medical personnel to arrange victim’s care and transportation. Simultaneously, they must also coordinate with other law enforcement to close roads and re-direct traffic as needed. Using only LMR, as multiple conversations happen simultaneously, these first responders could run out of channels or participants can become confused. Turtle Mike allows each of these entities to create a separate teleconference, keeping the conversations separate from one another.

Following the test, engineers immediately began developing solutions to shortfalls identified by the end-users. The tests also identified several successes, including identifying when participating hospitals lacked sufficient LMR coverage, but the broadband coverage worked fine, Chirhart said. By using the Turtle Mike, participants were able to extend communications coverage using the cellular network.

“Some radio bands don’t have the signal penetration in buildings that others do,” Chirhart elaborated. “The signals bounce off or are absorbed by the structure. Because broadband frequencies are higher, they have better signal penetration in densely constructed buildings.”

Phase one laboratory testing is currently concluding at the Public Safety Communications Research Program in Boulder Colorado. If the Turtle Mike solution is successful and approved, phase two testing with actual DHS users will take place in 2015. During phase two, S&T will update the preliminary prototype, correct shortfalls and add advanced features. The prototype will then undergo additional field tests to evaluate the technology and verify that responder requirements were met.

Last Updated: 02/08/2021
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