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Aerospace and Defense

Galileo Upgrade Will Cause Temporary Decline in Service
January 19, 2015

Galileo Upgrade Will Cause Temporary Decline in Service

Galileo Sensor Stations (GSSs) pick up Galileo signals in space (SIS) to perform clock synchronisation and orbit measurements which are fed back to the twin Galileo Control Centres to serve as the basis of the navigation message incorporating clock and position corrections and associated integrity data. Uplink Stations (ULSs) then uplink this navigation message to the Galileo satellite navigation payloads for rebroadcast to users. Telemetry, Tracking and Command Stations (TT&Cs) provide the link between the Control Centres and the satellite platforms. ESA figure

Galileo’s operation controllers will temporarily stop updating satellite orbital positions in the system’s navigation messages beginning near the end of this month in order to help implement upgrades in the ground mission segment, the European Space Agency (ESA) announced today (January 19, 2015).

Although the Galileo satellites will continue to transmit navigation signals, the generation and uplink of updated navigation messages will be interrupted during the last week of January for about five weeks.

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By Inside GNSS
DoD Seeks Sources for 50,000 eLoran Receivers
January 16, 2015

DoD Seeks Sources for 50,000 eLoran Receivers

In a nod to the usefulness of international enhanced Loran (eLoran) systems the U.S. Department OF Defense (DoD) in January began a search for companies able to supply some 50,000 eLoran receivers. Meanwhile a multi-agency team continues sketching out the structure of a potential U.S. eLoran system for federal officials weighing a relaunch of the program as a backup to GPS.

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By Inside GNSS
Raytheon, Lockheed Complete Another GPS III, OCX Development Exercise
December 18, 2014

Raytheon, Lockheed Complete Another GPS III, OCX Development Exercise

On Wednesday (December 17, 2014) Raytheon Company announced successful completion of the fourth of five planned launch and early orbit exercises being undertaken together with Lockheed Martin to demonstrate new automation capabilities, information assurance, and launch readiness of the U.S. Air Force’s next generation GPS III satellite and Operational Control System (OCX).

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By Inside GNSS
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Cut to GPS OCX Civil Funding Could Trigger New Delays as Scrutiny, Pressure Mount
December 16, 2014

Cut to GPS OCX Civil Funding Could Trigger New Delays as Scrutiny, Pressure Mount

With final passage of the Omnibus spending bill on December 13 Congress deepened by $17 million the fiscal ditch in which the new GPS ground system finds itself, possibly further delaying the completion of a modernized operational control segment (OCX) and increasing costs just as the Department of Defense’s top acquisition official steps in to take a closer look at budget overruns.

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By Inside GNSS
First GPS III Launch Slips to FY17
November 14, 2014

First GPS III Launch Slips to FY17

GPS III core structure at Lockheed Martin facility. Lockheed Martin photo

The launch of the first GPS III satellite could slip to as late as March 2017, further delaying a modernization program that already has been pushed back repeatedly by budget cuts and technical problems.

“The first GPS III launch is tentatively considered for the first half of FY17, based on booster availability and Air Force launch priorities,” a spokesman for the Space and Missile Systems Center told Inside GNSS.

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By Inside GNSS
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India Space Officials Release IRNSS ICD
September 30, 2014

India Space Officials Release IRNSS ICD

IRNSS-1B satellite in clean room. ISRO photo

A signal-in-space (SIS) interface control document (ICD) for the standard positioning service (SPS) of the Indian Regional Navigation Satellite System (IRNSS) is available for download from the Indian Space Research Organization (ISRO) website.

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By Inside GNSS
OCX Program Restructured, Delayed Again
September 24, 2014

OCX Program Restructured, Delayed Again

Editor’s Note: An exclusive interview with Gen. Hyten is available here with more details.

Details are emerging about another restructuring of the contract for the new GPS ground system, a deal that pushes completion of the project back another two years and recasts the remaining work to fit within the Air Force’s strained financial profile.

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By Dee Ann Divis
IFEN Launches SX3 Software Receiver
September 19, 2014

IFEN Launches SX3 Software Receiver

IFEN SX3

IFEN introduced its new SX3 GNSS software receiver, a major upgrade of the company’s SX-NSR, last week at the ION GNSS+ conference in Tampa, Florida. Redesigned hardware frontends feature four wideband RF frequency bands that can be split into a maximum of eight sub-bands per unit. At the same time the bandwidth has been expanded to a full 55 megahertz, offering additional signal power especially in the Galileo E5 band.

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By Inside GNSS
ESA Outlines Efforts to Rescue Wayward Galileo Satellites
September 16, 2014

ESA Outlines Efforts to Rescue Wayward Galileo Satellites

Orbits of the fifth and sixth Galileo satellites launched together on August 22, 2014, in red, compared to their intended position, in dashed green, and the position of the four IOV satellites launched in 2011 and 2012 in solid green. This view looks down over Earth’s South Pole, helping to illustrate how the two satellites’ orbital inclination relative to the equator is less than was intended ESA illustration.

The European Space Agency (ESA) released dramatic illustrations today (September 16, 2014) of the orbital locations of the two errant Galileo spacecraft launched on August 22, the intended orbit, and the locations of four In-Orbit Validation (IOV) satellites.

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By Inside GNSS
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