Global Navigation Satellite Systems Engineering, Policy, and Design
Figures 1 & 2Spacecraft in low Earth orbit (LEO), at altitudes below 3,000 kilometers, remain within the main Global Positioning System (GPS) signals’ Earth coverage. Spacecraft employing GPS at these altitudes enjoy signal availability and navigation and timing performance emulating that of terrestrial users.
By Inside GNSS
View of the Isar River, Munich, GermanyThe Munich Satellite Navigation Summit and exhibition will take place at the Residenz Muenchen in Munich, Germany on March 14 – 16, 2017.
Register here. Early bird rate until January 17, 2017.
The theme for this year’s summit is “GNSS: Is It Time for Backup?”
The technical program includes plenary discussions and updates on the
main activities in worldwide satellite navigation systems, including:
It’s official. The Department of Defense is sticking with its current GPS ground system development program and with its current prime contractor Raytheon — although the details of how it will realign the program remain unclear.
By Inside GNSS
Air Force Space Commander Gen. John HytenThe Department of Defense (DoD) is less than three weeks away from a decision on whether to retain, cancel, or change its contract to develop a new GPS ground system.
A source familiar with the program said they believe the Air Force will stick with the program but will recast it to fit more closely with DoD’s budget realities.
By Dee Ann Divis
Harris Corporation has delivered the first of 34 receivers to support the GPS Next Generation Operational Control System (OCX). The receiver was shipped to Raytheon Company, the prime contractor, in Aurora, Colorado, after it passed an electromagnetic interference test, Harris said.
By Inside GNSS
The first GPS III satellite’s delivery will be delayed by four months because of a Lockheed Martin subcontractor’s failure to test a ceramic capacitor.
The satellite, which was expected to be delivered in August, is now scheduled for shipment in December, according to a Bloomberg news article.
By Inside GNSS
Littleton, Colorado-based Lockheed Martin Space Systems has received a $395 million U.S. Air Force Space and Missile Systems Center contract option to build two additional GPS III satellites. The contract option calls for long-lead and production hardware to manufacture GPS III space vehicles (SVs) 9 and 10.
“The GPS III SV 9 and 10 satellites are expected to be ready for launch in 2022, thus sustaining the GPS constellation,” said Lt. Gen. Samuel Greaves, Space and Missile Systems Center’s commander.
By Inside GNSS
Air Force Space Commander Gen. John HytenSince Gen. John E. Hyten assumed leadership of Air Force Space Command in August 2014 he has been wrestling with a host of challenges including delays in the modernization programs for the GPS space segment and GPS military user equipment.
By Dee Ann Divis
The U.S. Air Force’s 2nd Space Operations Squadron (2SOPS) at the 50th Space Wing, Schriever Air Force Base, Colorado, has moved the longest-serving GPS satellite, space vehicle number (SVN) 23, into a disposal orbit several hundred miles above the operational GPS constellation.
The satellite, which was launched on November 26, 1990, had a rough start, the Air Force said. After early-orbit operations and initial stabilization in December 1990, SVN 23’s solar array stopped working.
By Inside GNSS
Col. Steve Whitney, GPS DirectorateA funding shortfall will not halt work on the new GPS ground system this month, although a decision expected in the next two weeks may signal major changes in the program.
Increased personnel costs on the Global Positioning System Next Generation Operational Control System (OCX) program had eaten up the fiscal year 2016 budget and were poised to force managers to stop work on September 15. The Pentagon had requested Congress to allow $39 million to be reprogrammed to bridge the gap but lawmakers left for the summer recess without approving the change.
By Inside GNSS
Figures 1-3Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.
By Günter W. Hein
The Miller family: Casey, Colleen, Mikel, Krista, Lauren, Trevor, and Megan.It has been a long journey to success for Mikel M. Miller, the U.S. Air Force’s lead scientist for positioning, navigation, and timing (PNT) science and technology development.
By Inside GNSS
Already running out of money and facing a shut down, the program to develop a new GPS ground system could see its funding tied up for more than a month, perhaps closer to two months, due to wrinkles linked to the Nunn-McCurdy breach declared for the program at the end of June.
By Inside GNSS
