According to a new GAO report, GPS satellites might soon go kaput. According to the GAO:
Some military operations and some civilian users could be adversely affected. In recent years, the Air Force has struggled to successfully build GPS satellites within cost and schedule goals; it encountered significant technical problems that still threaten its delivery schedule; and it struggled with a different contractor.
As a result, the current IIF satellite program has overrun its original cost estimate by about $870 million and the launch of its first satellite has been delayed to November 2009–almost 3 years late. Further, while the Air Force is structuring the new GPS IIIA program to prevent mistakes made on the IIF program, the Air Force is aiming to deploy the next generation of GPS satellites 3 years faster than the IIF satellites. GAO’s analysis found that this schedule is optimistic.
The sky isn’t falling and neither is the Global Positioning System, the U.S. Air Force said during a Twitter news conference, reports PC World.
“No, the GPS will not go down,” tweeted Col. Dave Buckman of the Air Force’s Space Command. “GAO points out, there is potential risk associated with a degradation in GPS performance. The issue is under control. We are working hard to get out the word. The issue is not whether GPS will stop working. There’s only a small risk we will not continue to exceed our performance standard,” the Air Force official said.
The tweet forum marked the first time Space Command has used its Twitter page for a scheduled forum. During the session, held Wednesday afternoon, the Air Force sought to allay fears raised by a Government Accounting Office report critical of its management of the GPS program.
The GAO report predicated only an 80 percent likelihood the Air Force would be able to maintain the full 24-satellite constellation over a period between 2010 and 2014. Going below 24 satellites could result in lower GPS performance, GAO said.
Don’t discount the likelihood of attack, or slew of attacks, says GPS World.
Equipment to interfere with the GPS signal is readily available over the Internet, as are instructions to bench-assemble one’s own. We have not adequately foreseen nor forestalled the havoc that some well-placed malfeasance could create.
Putting aside for a moment images of the wreckage, consider the after-effects, when Congress and/or other government bodies finally wake up to how vulnerable GPS and GPS-driven infrastructure truly are, and move to regulate or restrict its use. This could stifle the industry that has grown, so far, largely unfettered. Consider a public backlash that, misunderstanding, blames GPS and manufacturers for such a disaster.
Conventional GPS can have difficulty providing reliable positions in poor signal conditions, such as in city or rural canyons. Assisted GPS, or A-GPS can locate the device roughly by what cell site it is connected to. The assistance server accesses information from the reference network and has computing power beyond that of the GPS device and communicates with the GPS receiver via a wireless link.
The IIR-M satellites are modernized — hence the M designation — with an upgraded antenna panel that provides increased signal power to both military and civilian receivers on the ground, two new military signals for improved accuracy, enhanced encryption and anti-jamming capabilities for the military, and a second civil signal.
The final Block IIR-Ms went up in 2008 with a total of eight IIR-Ms now operational. The shift in GPS from an essentially military application to a dual-use system can be traced back to 1983, when Soviet fighter jets shot down a civilian passenger plane that had strayed into Soviet airspace. In response, President Reagan declared that GPS should be available for worldwide civilian use.
GPS satellites are popping up everywhere:
- The United States NAVSTAR Global Positioning System, as of this year, is the only fully operational GPS system. It consists of up to 32 medium Earth orbit satellites in six different orbital planes, with the exact number of satellites varying as older satellites are retired and replaced.
- The European Galileo program is expected to launch thirty operational satellites by 2012, offering five levels of service.
- GLONASS, from the Russian Federation, is expected to launch 24 satellites by 2017, with new M- and K-class satellites offering additional capabilities for civil users.
- China’s Beidou Compass currently is made up of 4 satellites, with experimental and limited coverage. However, China has planned to develop a truly global satellite navigation system consisting of 35 satellites known as Compass or Beidou-2.
GPS Magazine, Spatialnews, and GPS World have more.
Recent Comments