ad info  technology > computing
    Editions | myCNN | Video | Audio | Headline News Brief | Feedback  




Consumer group: Online privacy protections fall short

Guide to a wired Super Bowl

Debate opens on making e-commerce law consistent



More than 11,000 killed in India quake

Mideast negotiators want to continue talks after Israeli elections


4:30pm ET, 4/16










CNN Websites
Networks image

White House frees up civil GPS signal


May 2, 2000
Web posted at: 9:39 a.m. EDT (1339 GMT)

(IDG) -- President Clinton Monday afternoon announced an end to the Pentagon's practice of intentionally degrading the signal available to civil users of the satellite-based Global Positioning System (GPS), as sources had previously indicated he would do.

The change is scheduled to take effect after midnight tonight and will enable civilian GPS users "to pinpoint locations up to 10 times more accurately than they do now," the president said.

GPS consultants said the move will have "huge implications" for GPS users worldwide, including the nascent car navigation market. The White House itself pegged the value of the GPS market at $8 billion today and predicted it would double to $16 billion in three years.

  Computerworld's home page
  Computerworld Year 2000 resource center
  Computerworld's online subscription center's product reviews page
  Reviews & in-depth info at
  Year 2000 World
  Questions about computers? Let's editors help you
  Subscribe to's free daily newsletter for IT leaders
  Search in 12 languages
  News Radio
  * Fusion audio primers
  * Computerworld Minute

Clinton's decision to provide higher-accuracy GPS signals to all users worldwide comes just a week before member nations of the International Telecommunications Union meet in Turkey for the World Administrative Radio Conference. The Clinton administration says it needs additional spectrum to support transmission of two new civil GPS signals. But commercial mobile satellite systems operators and a new, satellite-based positioning system backed by the European Union are angling for the same spectrum.

When the Department of Defense started launching GPS satellites in the 1980s, it provided two classes of service: signals with an accuracy of 10 to 20 meters for military users and a degraded signal available to civil users with accuracy of 100 meters. That policy was meant to prevent potential adversaries from using the GPS technology to launch attacks against U.S. forces or targets.

Clinton's decision means that, from now on, civil users will benefit from the same GPS accuracy as military users - a change that a White House briefing paper said "will bring instant benefits to millions of GPS users."

GPS receivers range in price from $100 units toted by hikers to systems with price tags in the multiple thousands of dollars used by surveyors to gauge everything from the height of the Washington Monument, and to even more advanced GPS systems used by earthquake forecasters to track the movement of tectonic plates in California and other regions.

Clinton, speaking in the Roosevelt Room of the White House, said the decision to discontinue degradation of the civil GPS signal was based on a "threat assessment" that providing increased accuracy to nonmilitary users worldwide "would have minimal impact on national security." He added that the Pentagon "has demonstrated our capability to selectively deny GPS signals on a regional basis when our national security is threatened."

"The significance of this decision is huge," said Richard Langley, a GPS consultant and professor of geodesy at the University of New Brunswick in Canada. "It will affect a large number of GPS application areas."

Langley said automobile navigation systems, which feed GPS signals into a moving map display, will quickly show the results of the improved signal. "Right now, with 100-meter (accuracy), you might not even be positioned on the right map in the display," he said. "With the (degradation) turned off, those kind of map-matching errors will be significantly reduced."

Langley added that the decision to provide highly accurate GPS signals to civil users could also improve the U.S. position at the multinational administrative radio conference, which is scheduled to run through next month.

"This move definitely puts the U.S. in a more favorable light" in the global battle for spectrum with mobile satellite service providers and the European Union-backed Galileo proposal for a satellite positioning system, Langley said.

Clinton's move "will be absolutely great for our business," said Ann Ciganer, vice president for public policy at Trimble Navigation Ltd., a maker of GPS receivers in Sunnyvale, Calif. "It will improve sales because it will provide greater accuracy to GPS users ... everywhere across the spectrum, from hikers to surveyors."

Congress eliminates funding for new civilian GPS signal
October 8, 1999
EU to launch homegrown satellite navigation system
March 17, 1999
U.S. squadron pilots with commercial GPS
February 18, 1999
GPS: Going places in style
May 19, 1998
Navigate the world with personal global positioning systems
July 17, 1998

Feds moving to improve civil GPS signals
Ultra-wideband makes waves
Federal Computer Week
Mapping out potential GPS threats
Federal Computer Week
Rough patches on the road ahead for e-cars
Drive-by computing: Dawn of the dashboard desktop
PC World

International Telecommunications Union's World Radio Conference (WRC)
U.S. Department of Defense

Note: Pages will open in a new browser window
External sites are not endorsed by CNN Interactive.


Back to the top   © 2001 Cable News Network. All Rights Reserved.
Terms under which this service is provided to you.
Read our privacy guidelines.