Subscribe free to our newsletters via your
  GPS News  

Subscribe free to our newsletters via your

New reports confirm near-perfect performance record for civil GPS service
by Staff Writers
Los Angeles AFB CA (SPX) Jun 21, 2017

"The GPS Directorate remains committed to providing highly accurate and reliable PNT services to our users around the globe. The use of published standards to transparently guide data-driven decision making is how we have become the 'Gold Standard' in PNT," said Col. Steven Whitney, Director of the GPS Directorate. "The GPS Directorate is working every day on improved capabilities to ensure users receive the maximum benefit of the PNT services offered by GPS."

The U.S. Air Force released two technical reports demonstrating that the Global Positioning System (GPS) continues to deliver exceptional performance to civilian users around the world. GPS is a U.S. Air Force satellite system that provides highly dependable positioning, navigation, and timing (PNT) services to military and civilian users around the world, free of direct user charges.

Operated by the 50th Space Wing at Schriever Air Force Base, Colorado, the GPS constellation provides precise PNT services worldwide 24-hours a day, seven days a week.

The 2014 and 2015 performance reports confirm that the GPS Standard Positioning Service (SPS) satisfied nearly all measurable performance commitments documented in the GPS SPS Performance Standard, furthering the status of GPS as the "Gold Standard" for PNT.

The GPS Directorate at the U.S. Air Force's Space and Missile Systems Center commissioned the GPS SPS performance reports to enhance public transparency of the real-world performance of civil GPS. The reports confirm that GPS met all of the evaluated commitments for calendar years 2014 and 2015 with one exception.

This exception was that the reporting notification commitment for scheduled GPS satellite interruptions during calendar year 2014 was only met in 29 of 30 cases (96.7%). The vast majority of GPS users were not impacted by this single delayed notification.

In this single case, the U.S. Air Force only provided 17 hours of advanced notice, as opposed to the SPS PS commitment of at least 48 hours advanced notice, before the scheduled satellite interruption.

The commitments evaluated in the reports include those of accuracy, integrity, continuity, and availability of the GPS signals-in-space. For example, the signal-in-space ranging accuracy of the GPS civil signals was significantly better than the published standard of "7.8 meters or better at the 95th percentile."

This metric represents a key component in the total "user range error" that GPS receivers experience.

Most impressively, the oldest GPS satellites still provided an average signal-in-space accuracy of 2.8 meters during their worst performing month of 2015 - surpassing the target accuracy metric by over 300 percent. On average, the signal-in-space accuracy of the GPS constellation in 2015 was 1.4 meters, which is a 0.4 meter improvement over the accuracy in 2013.

The GPS SPS performance reports are generated by Applied Research Laboratories, the University of Texas at Austin (ARL:UT), which is a Department of Defense University-Affiliated Research Center.

Using data from 33 GPS monitoring and reference stations located around the globe, the ARL:UT team assesses GPS performance against the commitments defined in the 2008 GPS SPS Performance Standard (published here ). The ARL:UT reports focus on those commitments that can be verified by anyone with knowledge of standard GPS data analysis practices, familiarity with the relevant signal specifications, and access to a Global Navigation Satellite System data archive.

"The GPS Directorate remains committed to providing highly accurate and reliable PNT services to our users around the globe. The use of published standards to transparently guide data-driven decision making is how we have become the 'Gold Standard' in PNT," said Col. Steven Whitney, Director of the GPS Directorate.

"The GPS Directorate is working every day on improved capabilities to ensure users receive the maximum benefit of the PNT services offered by GPS."

ARL-UT expects to complete the 2016 SPS performance report later this year. The 2013, 2014, and 2015 reports are publicly available for free download here. The National Coordination Office for Space-Based PNT maintains the website to provide official information about GPS to the public.

Air Force Space Command's Space and Missile Systems Center, located at Los Angeles Air Force Base in El Segundo, California, is the U.S. Air Force's center of excellence for acquiring and developing military space systems. Its portfolio includes GPS, military satellite communications, defense meteorological satellites, space launch and range systems, satellite control networks, space-based infrared systems and space situational awareness capabilities.

BDS Precise Service System covers over 300 Chinese cities
Beijing (XNA) Jun 14, 2017
The Precise Service System of the BeiDou Navigation Satellite System (BDS) has been used in creating 317 smart cities in China, according to the Smart BDS Precise Application Summit opened on Monday. BDS Precise Service System can provide precise positioning services for household gas and heat, power grid, water supplies,drainage and smart transportation. Sun Jiadong, an academician ... read more

Related Links
Los Angeles Air Force Base
GPS Applications, Technology and Suppliers

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once

credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly

paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

China 'backyard' pig farmers squeezed as sector scales up

Climate imperils Ethiopia's coffee output

Waste not, want not

Highly safe biocontainment strategy hopes to encourage greater use of GMOs

Breakthrough by Queen's University paves way for smaller electronic devices

Graphene transistor could mean computers that are 1,000 times faster

Seeing the invisible with a graphene-CMOS integrated device

Optical communication using solitons on a photonic chip

Grounded US F-35s to resume flying after oxygen problem

Lockheed, Tata agree to move F-16 production line to India

US, Qatar agree F-15 fighter sale

Saab completes first Gripen E test flight

Ford to import Focus cars built in China

China's Mobike raises $600 mn to fund bike-sharing expansion

Scientists inch closer to wirelessly charging moving electric vehicles

Wireless charging of moving electric vehicles overcomes major hurdle in new Stanford study

Japan logs surprise trade deficit in May as energy costs expand

NAFTA renegotiation may extend into 2018: US official

China freezes bank accounts of over 100 Myanmar traders

French miner signs Guinea bauxite deal with Franco-Asian consortium

Religious leaders join forces to protect rainforests

Peatlands, already dwindling, could face further losses

Tropical peat forests risk turning from carbon "drains" to emitters

Activists block logging in Poland's ancient forest

Free mapping: plotting development in Africa

Satellites forewarn of locust plagues

NASA satellites image, measure Florida's extreme rainfall

The heat is on for Sentinel-3B

Silver atom nanoclusters could become efficient biosensors

Chemists perform surgery on nanoparticles

Superconducting nanowire memory cell, miniaturized technology

Nanotechnology reveals hidden depths of bacterial 'machines'

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement