PowerDown : Achieving Low Energy-Per-Fix in Cell Phones Jul 1, 2006 By: Wayne Ballantyne, Gregory B. Turetzky, Gary Slimak, John Shewfelt

Accelerating deployment of location-based services requires reducing the energy-per-fix (EPF) to a minimum, as continuous tracking shortens cell-phone battery life. This article focuses on realizing a low-current RF front end, minimizing RF active time, and developing an intelligent GPS middleware layer to determine whether a low EPF is likely or necessary.

Implant Issues More than Skin Deep Jun 1, 2006 By: Tracy Cozzens

Applied Digital Solutions created a buzz when it tested a prototype of a GPS implant in the spring of 2003. The disc-shaped personal location device measured more than 6 centimeters in diameter and more than a centimeter deep — about the size of a heart pacemaker.

To Locate a Phone or PDA GNSS/UMTS Prototype for Mass-Market Applications Jan 1, 2006 By: GÜnther Heinrichs, Jinkel, Christian Drewes, Linus Maurer, Andreas Springer, Rainer Stuhlberger, Christian Wicpalek

An important step for Galileo will be availability of hybrid Galileo/GPS receivers in combination with wireless communications network positioning capabilities for consumer applications. This article presents ideas regarding an integrated GNSS/UMTS receiver architecture to meet the needs of seamless indoor/outdoor navigation.

“We were having success with this technology before, but now we have all these major players launching LBS, indicative of a momentum we’ve never seen before.”

Getting into Pockets and Purses Antenna Counters Sensitivity Loss in Consumer Devices Nov 1, 2005 By: Brad Hurte, Oliver Leisten

Add one more to the list of challenges faced by consumer GPS-enabled devices: the human hand that holds them. Body loading significantly degrades receiver sensitivity. A dielectrically loaded quadrifilar helix antenna can ameliorate this condition.

Assistance When There's No Assistance Long-Term Orbit Technology for Cell Phones, PDAs Oct 1, 2005 By: David Lundgren, Frank van Diggelen

Long-Term Orbit data, obtainable over the Internet, can enable a locatable cell phone or PDA to position itself accurately for as long as four days without further assistance.

Where's Fido? GPS, GSM Trail Companion Canines Aug 1, 2005 By: Marty Whitford

GPS and GSM help keep tabs on canine companions.

Accurate Time Assistance Synchronizing GSM Mobile Telephones to Microseconds Jul 1, 2005 By: Peter J. Duffett-Smith, Paul Hansen

A new Matrix positioning method provides precise-time aiding to terminals in un-synchronized communications networks.

100 Million Strong Industry Eyes LBS Tipping Point May 1, 2005 By: Alan Cameron

Time has come today for location-based services. Wireless carriers, manufacturers of GPS-enabled devices, service providers, and application developers stand ready.