"For those keeping score, the four more powerful GPS-3 satellites will represent a little better than 12% of the 31 satellites in the constellation, but the number's growing." "GPS-3 provides three times greater accuracy and up to eight times improved anti-jamming power over satellites in the existing constellation," Tonya Ladwig, acting vice president of Lockheed Martin's Navigation Systems Division, told reporters in a recent teleconference. Orbiting in multiple planes, at least four GPS satellites are above the horizon as viewed from any point on Earth, broadcasting ultra-precise atomic clock signals allowing military and civilian receivers to compute a user's precise position, altitude and velocity. Assuming tests and checkout go well, it will join a globe-spanning constellation of 31 GPS satellites. The GPS-3 satellite - the fourth in a series of more powerful third-generation navigation stations built by Lockheed Martin - was expected to be deployed about a 90 minutes after liftoff.
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