SafeLink Indoor Positioning


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Advanced Location-Based Services
Revolutionary Location-Based Services That Work Everywhere

    In development since 2005, SafeLink™ is a unique wide-area two-way positioning system that works deep indoors blanketing entire metropolitan areas where GPS is unusable. SafeLink aims to serve the world's civilian market in indoor and urban spaces where most people spend most of their time on a daily basis.

    Commercial broadcast power levels and frequencies are one-billion times better than GPS at penetrating structures. Broadcasts serve as the positioning beacons for SafeLink miniature locator units. The locator units report their positions to remote subscribers on ordinary telephones or data connections through standard wireless networks. Alternatively, proprietary SafeLink skywave spread spectrum data links may be used that require no radio infrastructure.

    Unlike GPS, SafeLink offers high-accuracy positioning in three dimensions, making it ideal for locating persons within buildings as required by the FCC E911 mandate. Standard indoor positioning accuracy is comparable to or better than that of GPS outdoors. However, unlike GPS, subscribers may augment the free broadcast infrastructure with license-free beacons where exceptionally high-precision positioning accuracy is needed.

    SafeLink can operate as a stand-alone system in areas with commercial broadcasts. Alternatively, SafeLink can be integrated with GPS to seamlessly extend GPS coverage to the indoor home and office spaces where most people live and work on a daily basis. This vast worldwide market is unserved. SafeLink has been built and demonstrated, has patent protection and has virtually no competition.

Indoor-Outdoor Positioning
"GPS on Steroids"

Demonstration System

SafeLink™ geolocation technology is much more than a minor improvement to GPS. It is an all-new, proprietary and patented geolocation solution with wide-area urban and deep indoor coverage. No satellite-based system will ever be capable of SafeLink's indoor penetration. And SafeLink's existing broadcast infrastructure is free.

SafeLink uses standard commercial broadcast signals as position references. Their high power levels and low frequencies are one billion times more effective than GPS at reaching into the deep indoor and urban spaces where most people spend most of their time on a daily basis. SafeLink has been optimized for the civilian market.

Broadcast signals are powerful, nearly immune to interference and jamming, and unaffected by GPS disruptions. Measurement accuracy is superior to GPS in all three axes. Safelink's blanket metropolitan coverage is very difficult to evade. With SafeLink, protected persons and property “can't be lost” indoors or out.

Applications include mini-locators for persons, and embeddable chipsets for consumer products such as cell phones and laptops. Subscribers can find protected persons and devices remotely by telephone and on-line, and receive locations as spoken street addresses. Location information is private, available only to the service subscriber.

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

Accurate Indoor Positioning
in GPS-Denied Areas
Using Broadcast Signals

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

The target was placed at a noisy indoor location with no detectable 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.