satellites/space segment

First Civil Funds for GPS Program
April 2, 2008

First Civil Funds for GPS Program

FY09 GPS Budget Request; FAA Line Item

The GPS program has passed a milestone of sorts with the first allocation of funds from civil agencies to pay for a portion of the core GPS budget.

The Fiscal Year 2008 (FY08) budget for the U.S. Department of Transportation (DoT) sets aside $7.2 million as the first installment on the civil share of GPS modernization efforts, including the L1C signal that will be transmitted on the GPS Block III satellites and costs of monitoring the civil GPS signals in the modernized ground control segment (OCX). For the FY09 budget, the Bush administration has requested a $20.7 million allocation. The total five-year civil contribution (FY09-13) is expected to be more than $200 million.

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By Glen Gibbons
GIOVE-B Reaches Baikonur Launch Site, Undergoes Pre-Flight Check
March 20, 2008

GIOVE-B Reaches Baikonur Launch Site, Undergoes Pre-Flight Check

GIOVE-B, the second Galileo in-orbit validation satellite, has arrived safely at the Baikonur Cosmodrome in Kazakhstan, where it is undergoing pre-flight checks in preparation for its launch early on April 26.

After completing final tests at the European Space Agency (ESA) space technology center in Noordwijk, The Netherlands, the spacecraft was transported to Baikonur aboard an Antonov An-124 cargo aircraft.

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By Glen Gibbons
Another Successful GPS Launch, Plan Produce Back-Up and Improved Capability
March 11, 2008

Another Successful GPS Launch, Plan Produce Back-Up and Improved Capability

Successful launch of a GPS Block IIR satellite on March 15 continues a U. S. Air Force initiative to bolster the nation’s GNSS constellation against anticipated failures of aging on-orbit spacecraft while improving system accuracy and accelerating the availability of new military signals.

An analysis of the condition of subsystems on GPS satellites in orbit last year indicated that up to nine GPS space vehicles (SVs) could fail in the near future, according to Col. David Madden, commander of the GPS Wing at the Space & Missile Systems Center, Los Angeles Air Force Base, California. “That’s what drove us down this path of launching five in one year,” said in a recent news conference.

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By Glen Gibbons
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China's Compass/Beidou: Back-Track or Dual Track?
March 2, 2008

China’s Compass/Beidou: Back-Track or Dual Track?

A recent presentation on Compass/Beidou that appeared to reflect a step back from China’s GNSS program more likely represented a step sideways — and an implicit acknowledgment of the complex political and technical elements involved in such an enterprise.

In February 20 remarks at the Munich Satellite Navigation Summit in Germany, Jing Guifei, a project manager at the National Remote Sensing Center of China (NRSCC), seemed to play down the global aspects of Compass — or Beidou 2 — while underlining near-term efforts to implement a regional capability for the system.

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By Glen Gibbons
President’s FY09 Budget Proposes $1.2 Billion for GPS Program
February 27, 2008

President’s FY09 Budget Proposes $1.2 Billion for GPS Program

The White House

President Bush’s Fiscal Year 2009 (FY09) budget released earlier this month proposes an allocation of nearly $1.2 billion dollars for GPS operations, according to the Space and Missile Systems Center’s GPS Wing at Los Angeles Air Force Base, California.

If approved, the budget would support continued development of the GPS III satellite program with a first launch in FY14. The somewhat delayed target date appears to match the prediction of the GPS Wing that the first GPS III launch would be set back a few months as a result of Congressional cuts in the FY08 GPS budget.

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By Glen Gibbons
GLONASS CDMA Signals Near Approval
February 22, 2008

GLONASS CDMA Signals Near Approval

Russia appears ready to add code division multiple access (CDMA) signals to its frequency division multiple access (FDMA) GLONASS system.

A final decision is expected next week, according to Sergey Revnivykh, deputy head of the Russian GNSS Mission Control Center, in a February 20 presentation to the Munich Satellite Navigation Conference in Germany. Under the plan, CDMA signals would be introduced at L1 and L5 frequencies near GPS and Galileo signals, beginning with the GLONASS-K generation of satellites that will launch in 2010.

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By Inside GNSS
GPS Block IIF Satellite to Enter New Round of SMC Tests
January 24, 2008

GPS Block IIF Satellite to Enter New Round of SMC Tests

Block IIF satellite undergoing tests at Space & Missile Systems Center, Los Angeles Air Force Base, California

Having successfully passed its initial phase of tests at the Space & Missile Systems Center at Los Angeles Air Force Base, the first GPS Block IIF (follow-on generation) satellite is expected to enter the second round of thermal vacuum testing in late March, according to the GPS Wing.

On December 24, the GPS IIF program completed the first of two phases of thermal vacuum testing on the first IIF space vehicle (SV-1) built by The Boeing Company. This was "a major success for the program," in the words of GPS Wing officials. Thermal-vac tests exposed the spacecraft to extreme hot and cold temperatures under vacuum conditions to verify system performance and correlate the thermal models, according to the GPS Wing.

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By Glen Gibbons
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AFIT Releases GPS System Engineering Case Study
January 17, 2008

AFIT Releases GPS System Engineering Case Study

The GPS constellation, as illustrated 30 years ago.

While awaiting the arrival of the definitive history of the Global Positioning System, students of the premier GNSS program might want to take a look at a systems engineering case study released last month by the Center for Systems Engineering at the Air Force Institute of Technology (AFIT), Wright-Patterson AFB, Ohio.

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By Glen Gibbons
GIOVE-B in tests-lowRez.jpg
January 6, 2008

Galileo’s GIOVE-B to Launch April 14

The first Galileo experimental satellite, which marked its second anniversary in space on December 28, may soon have company.

Designated the Galileo In-Orbit Validation Element–A (GIOVE-A) satellite, the spacecraft has been broadcasting a variety of signals since January 2006, using on-board rubidium clocks for time-tagging signal transmissions. Now, GIOVE-B — the larger second experimental satellite, which will carry one hydrogen maser and two rubidium clocks, is nearing readiness for transfer to the Russian Baikonur launch facility in Kazakhstan.

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By Glen Gibbons
India’s GAGAN Passes Its Final Test
January 3, 2008

India’s GAGAN Passes Its Final Test

The Raytheon Company has announced that it successfully completed the final system acceptance test to augment standard GPS signals over India.

GAGAN stands for GPS Aided GEO Augmented Navigation-Technology Demonstration System. It monitors GPS satellite signals for errors and then generates correction messages to improve positioning accuracy for users.

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By Glen Gibbons
Additional GPS IIR-M Satellite Launched, Quickly Begins Transmitting
December 19, 2007

Additional GPS IIR-M Satellite Launched, Quickly Begins Transmitting

The U.S. Air Force launched the fifth modernized GPS Block II Replenishment (IIR-M) satellite at 3:04 p.m. EST (20:04 UTC) December 20 from Cape Canaveral Air Force Station, Florida, (December 20) aboard a United Launch Alliance Delta II rocket. Air Force controllers set the spacecraft to "healthy" status on January 2, in what is probably a record time of 13 days.

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By Glen Gibbons
China to Reveal Compass Plans ‘Soon’
December 10, 2007

China to Reveal Compass Plans ‘Soon’

Liao Xiaohan, Deputy Director-General of High & New Technology Development and Industrialization, MOST

China will release details of its Compass (or Beidou 2) program “soon,” including an Interface Control Document (ICD) for the GNSS system’s open civil service and a launch schedule for additional satellites, according to representatives of the China Satellite Navigation Engineering Center speaking at the Shanghai Navigation Forum (NaviForum) in Shanghai on Thursday and Friday (December 6-7).

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By Glen Gibbons
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