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The Mission




Rocket: Delta 4
Payload: GPS 2F-2
Date: July 16, 2011
Window: 2:41-3:00 a.m. EDT (0641-0700 GMT)
Site: SLC-37B, Cape Canaveral, Florida
Feed: AMC 3, Transp. 16, C-band, 87° West

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GPS navigation satellite takes nighttime ride to orbit
BY JUSTIN RAY
SPACEFLIGHT NOW

Posted: July 16, 2011


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Continuing a prolific partnership that has benefited billions of users around the world, the Delta rocket family today successfully launched its 50th satellite for the Global Positioning System.


The Delta 4 rocket fires away from the Cape. Credit: Pat Corkery/ULA
See launch photo gallery

 
The powerful Delta 4 booster blasted away from Cape Canaveral's Complex 37 at 2:41 a.m. EDT (0641 GMT) for a middle-of-the-night ascent precisely timed to deliver a critical replacement satellite directly into the GPS constellation.

It was the type of rocket flight that could appear routine. But replenishing the navigation network is vital to the military forces, civilian consumers and the blossoming commercial marketplace that have come to depend on GPS every day.

Known as the GPS 2F-2 satellite, this newest bird will take the place of the GPS 2A-11 spacecraft that just celebrated its 20th birthday in orbit, exceeding the the wildest expectations for longevity.

That old craft was deployed by a Delta 2 rocket from Cape Canaveral on July 3, 1991, during the heydays of launching GPS satellites at a fast and furious rate.

The Delta 2 booster was conceived in the late 1980s because the Air Force needed a reliable launcher to get its space-based navigation system off the ground. That marriage clicked and the worldwide phenomenon called GPS was born.

From the first launch on Valentine's Day 1989 through its last in 2009, the Delta 2 assembled the entire operational constellation and then sustained it with fresh craft, experiencing only one failure along the way.

The bigger Delta 4 took over with the next-generation GPS satellite series in 2010 and didn't disappoint the legacy today during its second launch for the system.

"This mission represents the epitome of teamwork and we're proud to have served alongside a dedicated and well-integrated government and contractor team over the last two decades in successfully launching GPS missions for the United States Air Force," said Jim Sponnick, United Launch Alliance's vice president of mission operations.


The Delta 4 rocket launches with GPS 2F-2. Credit: Pat Corkery/ULA
See launch photo gallery

 
And while the Delta rockets have grown more capable over the years, the GPS satellites also evolved to improve the system's quality, accuracy and strength.

The newest breed, called GPS Block 2F, is the most advanced yet fielded.

"GPS 2F enhances the constellation by providing increased accuracy through improved atomic clock technology, a more jam-resistant military signal and a more powerful and secure civilian signal to help commercial airline operations and search-and-rescue missions," said Jon Goodney, the GPS 2F deputy program director at Boeing.

GPS satellites orbit about 11,000 nautical miles above the planet and emit continuous navigation signals that allow users to find their location in latitude, longitude and altitude and determine time. The constellation features six orbital planes with multiple satellites flying in each.

"GPS is a global utility providing highly accurate position, navigation and timing services at no cost to billions of people," said Goodney. "Originally developed for military use, it's since been adopted as the foundation of modern communications. GPS saves lives and enhances quality of living. And adding GPS 2F-2 ensures the constellation will remain robust."

The roots of GPS are firmly entrenched with the U.S. military, which developed the satellites to guide the warfighter with unparalleled exactness.

"Nearly every piece of military equipment uses GPS precision timing and navigation capabilities to perform its missions more safely and effectively," said Col. Bernard Gruber, director of the Air Force's GPS Directorate.

Today's GPS fleet is comprised of 31 satellites, including 11 Block 2A's made by Boeing, 12 Block 2R's and seven 2R-Modernized spacecraft built by Lockheed Martin, and Boeing's first Block 2F.

"The GPS constellation remains healthy, stable and robust. We have 31 operational satellites on-orbit actively broadcasting position, navigation and timing information to users around the world," said Col. Christopher Warack, space systems program manager at GPS Directorate.


An artist's concept shows a GPS 2F satellite in Earth orbit. Credit: Boeing
 
Ground controllers expect to have the GPS 2F-2 satellite checked out and ready for service about 30 days after launch. It will occupy the Plane D, Slot 2A location of the network.

"I'm extremely pleased with today's successful launch," said Gruber. "The GPS system's overall navigational accuracy will improve as more GPS 2F space vehicles are put into service."

"The GPS 2F satellites will become the backbone of the GPS constellation over the next 15 to 18 years. GPS 2F satellites continue our modernization efforts to provide new space-based capabilities to ensure GPS remains the gold standard for PNT (position, navigation and timing) information," said Warack.

Boeing's Block 2F series has a dozen satellites in all, with two now in space. The launches are called up when the constellation needs to replace a bird, slowly but surely populating the network with the enhanced features as the aging craft retire.

"I would suspect as we go forward the launch rate will stay fairly low for another year or two, but then will pick up," said Warack.

The next GPS launch is tentatively targeted for September 2012.

"GPS is integrated into every facit of U.S. military operations and we are committed to responsible stewardship of GPS as a global utility," Warack added.

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