GPS Modernization

Extra Life for IIRs, IIR-Ms

August 29, 2013By

U.S. Air Force engineers are testing on-orbit a technique to extend the life of the 19 GPS IIR and IIR-M satellites on orbit, roughly 60 percent of the current constellation. A new charging method may reduce the rate of satellite battery degradation, thereby extending satellite operational life. If the technique passes the test, the initiative could add a combined 20... read more

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The System: IRNSS Success, GLONASS Bellyflop

August 1, 2013By

IRNSS Success The Indian Regional Navigation Satellite System (IRNSS) successfully launched its first satellite on July 1 from the Satish Dhawan Space Centre at Sriharikota spaceport on the Bay of Bengal. An Indian-built Polar Satellite Launch Vehicle PSLV-C22, XL version, carried the 1,425-kg satellite aloft. IRNSS-1A is the first of seven satellites that will make up the new constellation: four satellites... read more

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Public Interface Control Working Group Meeting Set for September

July 29, 2013By

The Air Force has issued a Federal Register Notice regarding an upcoming Public Interface Control Working Group (ICWG) meeting, set for September 24-25. Here is the notice: Public ICWG Announcement—2013 This notice informs the public that the Global Positioning Systems (GPS) Directorate will be hosting a Public Interface Control Working Group (ICWG) meeting for the NAVSTAR GPS public signals in... read more

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Lockheed Martin Prototype to Help Prep for GPS III Launch

July 23, 2013By

Lockheed Martin has delivered a full-sized, functional prototype of the next-generation GPS satellite to Cape Canaveral Air Force Station to test facilities and pre-launch processes in advance of the arrival of the first GPS III flight satellite. The GPS III Non-Flight Satellite Testbed (GNST) arrived at the Cape on July 19 to begin to dry run launch-base space-vehicle processing activities... read more

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Lockheed Martin Delivers Antenna Assemblies for First GPS III Satellite

July 15, 2013By
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Lockheed Martin has completed and is preparing to install the navigation, communication, and hosted payload antenna assemblies for the first satellite of the next-generation GPS III. Seven antenna assemblies, produced at Lockheed Martin’s Newtown, Pennsylania, facility were delivered to the company’s GPS III Processing Facility (GPF) near Denver, Colorado, on June 14.  The antennas will be installed on the first... read more

Lockheed Martin GPS III Prototype Validates Test Facilities

July 10, 2013By
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Lockheed Martin’s GPS III Non-Flight Satellite Testbed (GNST) has successfully completed a series of high-fidelity pathfinding events which validate the process and facility for vehicle integration checkout, as well as signals interference testing, that the next-generation satellites of GPS III will go through before delivery for launch. An innovative investment by U.S. Air Force under the original GPS III development... read more

2C or Not 2C: The First Live Broadcast of GPS CNAV Messages

July 8, 2013By

By Oliver Montenbruck, Richard B. Langley, and Peter Steigenberger Over the past several years, some users of the GPS navigation system have already benefitted from the addition of various new signals in addition to the legacy C/A- and P(Y)-code. With the introduction of the Block IIR-M satellites in 2005, a new civil signal (L2C) was transmitted on the L2 frequency,... read more

Innovation: Getting a Grip on Multi-GNSS

July 1, 2013By
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The International GNSS Service MGEX Campaign
GPS is almost 40 years old. While mass consumer use of GPS began only within the past decade or so, GPS was "born" during the Labor Day weekend of 1973, when about a dozen military officers and industry analysts under the leadership of Brad Parkinson met to consolidate the concept for a single satellite-based navigation system for the U.S. Department of Defense. Their proposal for NAVSTAR GPS was approved on December 22, 1973. The first satellite to be launched under the GPS program, on July 14, 1974, was the Naval Research Laboratory’s Navigation Technology Satellite (NTS) 1. read more

This article is tagged with and posted in BeiDou/Compass, From the Magazine, Galileo, GLONASS, GPS Modernization, Innovation