A: System Categories

Interference Mitigation in the E5a Galileo Band Using an Open-Source Simulator

Interference Mitigation in the E5a Galileo Band Using an Open-Source Simulator

Four global navigation satellite systems are scheduled to be fully operational orbiting Earth in the coming years: the NAVSTAR Global Positioning System (GPS) from the United States, the GLObal NAvigation Satellite System (GLONASS) from Russia, the Compass/BeiDou-2 System (BDS) from China, and Galileo from Europe. A considerably high number of signals, coming from the satellites of those constellations, will share the radio electric spectrum.

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By Inside GNSS
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The Emerging Legal Debate Around Japan’s QZSS

Japan’s regional and augmentation positioning system, the Quasi-Zenith Satellite System (QZSS), is a project yet to be developed. While it will become a constellation of seven satellites covering the western Pacific area, only “Michibiki,” the first satellite launched in 2010 for technological validation , is now in orbit.

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By Ingo Baumann
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First Results

First Results

In February 2011, Russia launched the first satellite of the GLONASS-K1 series, i.e., SVN (space vehicle number) 801 (R26), which in addition to the legacy frequency division multiple access (FDMA) signals, for the first time was enabled to transmit code division multiple access (CDMA) signals on the GLONASS L3 frequency (1202.025 MHz). Later in 2014, the GLONASS program added SVNs 802 (R17) of series K1 and 755 (R21) of series M, and in 2016, SVN 751 of series M, with the capability of transmitting CDMA L3 signals to the constellation.

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By Inside GNSS
Federal Agencies Plan Shutdown of 37 Differential GPS Stations

Federal Agencies Plan Shutdown of 37 Differential GPS Stations

The U.S. Coast Guard, the U.S. Army Corps of Engineers (USACE), and the Department of Transportation (DoT) released a Federal Register notice today (July 5, 2016) announcing a reduction of the Nationwide Differential Global Positioning System (NDGPS).

The planned reduction calls for the shutdown and decommissioning of 37 DGPS sites, leaving 46 operational sites available to users in coastal areas. Termination of the NDGPS broadcasts is scheduled to occur on August 5, 2016.

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By Inside GNSS
Army Plans Awards, Solicitations for Assured PNT with(out) GPS
July 1, 2016

Army Plans Awards, Solicitations for Assured PNT with(out) GPS

The U.S. Army will soon release new contracts and a post-Milestone B solicitation as part of its shift to a system of systems approach for making sure warfighters have the position, navigation, and timing (PNT) information they need regardless of issues with getting the GPS signal.

The Assured PNT (APNT) approach incorporates multiple sensors and an open architecture into an integrated whole that is resilient and easy to update, explained Kevin Coggins, the direct reporting program manager for PNT.

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By Dee Ann Divis
Homeland Security, PNT ExCom Move on Backing Up GPS

Homeland Security, PNT ExCom Move on Backing Up GPS

The Department of Homeland Security (DHS) is moving forward to establish a backup for the position, navigation, and timing (PNT) information provided by GPS. This month the agency assumed the lead in a yearlong effort to specifically define the requirements for an alternative source of timing information to and released a solicitation for research to help protect critical infrastructure from timing disruption or spoofing.

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By Inside GNSS
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Air Force Declares Nunn-McCurdy Breach on the New GPS Operational Control System
June 30, 2016

Air Force Declares Nunn-McCurdy Breach on the New GPS Operational Control System

Secretary of the Air Force Deborah Lee James declared a critical Nunn-McCurdy breach on the GPS Next-Generation Operational Control System (OCX) today (June 30, 2016).

After a December 2015 Program “Deep Dive,” Undersecretary of Defense for Acquisition, Technology and Logistics Frank Kendall placed the OCX program under significant Department of Defense (DoD) oversight with quarterly reviews.

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By Inside GNSS
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Four-Satellite Launch Dispenser Ready for Europe’s Galileo Ride on Ariane 5

A new dispenser for a modified Ariane 5 rocket, capable of carrier four satellites into middle Earth orbit, has passed an extended test campaign and approved for launch, removing a final hurdle for accelerating development of the Galileo constellation.

In development since 2012, the new launcher design evolved from the Ariane 5 ES (Evolution Storable) that is used to carry European Space Agency (ESA) automatic transfer vehicle (ATV) supply spacecraft into low Earth orbit.

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By Inside GNSS
Senate Passes Defense Authorization Bill "Fencing Off" Funding for Next-Generation GPS Control System
June 22, 2016

Senate Passes Defense Authorization Bill “Fencing Off” Funding for Next-Generation GPS Control System

The Senate approved defense authorization legislation last week before heading out for weekend campaigning. The measure contains a provision the White House said would further delay completion of the already overdue next-generation GPS control system (OCX) by 6 to 12 months.

Senators passed their version of the National Defense Authorization Act (NDAA) for Fiscal Year (FY) 2017 on June 16, defying the White House, which had said June 7 it would veto the bill.

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By Inside GNSS
ION ITM - PTTI 2017: ION International Technical Meeting and Precise Time/Time Interval Meeting

ION ITM – PTTI 2017: ION International Technical Meeting and Precise Time/Time Interval Meeting

The Institute Of Navigation (ION) annual technical meeting (ITM) will be held in conjunction with the Precise Time and Time Interval Meeting (PTTI) at the Hyatt Regency Monterey in Monterey, California on January 30 through February 2, 2017.

This year’s joint ITM/PTTI Plenary Session: Back to the Future: Forecasts for Time and Navigation, 1917 and 2017 will explore significant forecasts made in 1917 about time and navigation and relate them to the future as we envision it from 2017.

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By Inside GNSS
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