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FCW : September 15, 2016
The feature had been added to block uses of the GPS system by enemy actors, but it was discon- tinued when the Defense Department concluded it was no longer needed. Without it, the margin of error for civilian uses of the satellite system sharp- ened from 100 meters to less than 20 meters. The new, more accurate GPS started a boom in the market for geolocation applications within and outside government. Today GPS technology is embed- ded in devices as varied as cell phones and snow- plows and used in indus- trial applications ranging from construction to sup- ply chain management. Even before the GPS system was opened up, federal agencies had been busy designing new civil- ian applications. In 1997, NASA began experimenting with the use of GPS receivers to pinpoint within a few feet the exact position of a space shuttle, aircraft or individual on the ground. At the National Oceanic and Atmo- spheric Administration, surveyors were testing the use of GPS to main- tain the integrity of some of the fed- eral government’s architectural trea- sures. In summer 1999, NOAA teamed with the National Park Service to use GPS to measure micro-scale shifts of the Washington Monu- ment’s foundation. Throughout the 1990s, the Federal Aviation Administra- tion pursued GPS in its search for ways to conduct more precise airplane approaches in less time and under poorer weather condi- tions than ever before. And as geospatial data powers an ever- growing range of gov- ernment missions, the accuracy of the data continues to improve as well. In February, for example, research- ers at the University of California, River- side’s Bourns College of Engineering devel- oped a method for using a device’s own inertial measurement unit to deliver centimeter-level GPS location accuracy. That advancement could be hugely important for auton- omous vehicles, mobile phones and precision agriculture technologies, researchers said. n 20 September 15, 2016 FCW.COM MAY 2000 THE OPENING UP OF GPS In May 2000, President Bill Clinton authorized the removal of a security feature from the Global Positioning System — a decision that opened the doors to accurate geospatial data for thousands of government and consumer applications. The presidential order dramatically improved the accuracy of satellite- based navigation by turning off Selective Availability — a dithering function designed to intentionally distort GPS timing and positioning data. NOAANEWS.NOAA.GOVAPIMAGES The Commerce Department’s Dave Ward checks the alignment of the GPS receiver atop the Washington Monument. 0915fcw_014-022.indd 20 8/23/16 9:33 AM
August 30, 2016
September 30, 2016