SafeLink Indoor and Outdoor Location Based Services

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Advanced Location-Based Services

New Indoor Geolocation Technology Enables
Location-Based Services That Work Everywhere

Revolutionary Technology

Demonstration System

SafeLink™ geolocation technology uses standard commercial broadcast signals as position references to provide indoor Location-Based Services that are superior to GPS and cellular triangulation.

The high power levels and low frequencies of commercial broadcasts reach deep into the indoor and urban spaces where people spend most of their time on a daily basis. Three-axis position resolution isolates individual rooms and floors in structures throughout large metro areas, and the low frequencies minimize multipath interference.

SafeLink's 60 dB signal power advantage over GPS means it can work indoors where GPS signals are undetectable, giving accuracy as good as a few meters in all three axes. Importantly, this performance is achieved with standard broadcast signals, eliminating infrastructure costs.

Applications include mini-locator modules for persons, and embeddable chipsets for consumer products. Subscribers can access their services from anywhere, online and by phone, with locations reported to them as spoken street addresses.

A working SafeLink demonstration system is operating in Los Angeles, and a miniature chipset development program is in progress.

Thanks to Safelink's blanket coverage that is very difficult to evade, protected persons and property "can't be lost." Such pervasive security has not been available until today, and one can think of few products more needed in our society.

A Plot of SafeLink Geolocation Measurement Repeatability using
Unmodified Commercial Broadcasts

This map shows the repeatability of a series of geolocation measurements performed on a target under constant conditions and given broadcast station topology in the Los Angeles area.

In this case the target was positioned at a noisy indoor location with no GPS service. The commercial broadcast stations were located approximately 30 km distant from the target and grouped roughly to the east of the target. It can be seen that the measured geolocation results fall within a rough ellipse with N-S major axis.

As expected, the grouping of measured results becomes more circular in shape and smaller in diameter when broadcast stations are more widely distributed around the target, if all other factors remain unchanged.