One example is Automatic Dependent Surveillance - Broadcast (ADS-B), an innovation that extends air traffic surveillance and communication beyond traditional ground-based systems to space-based navigation employing satellite positioning for equipped aircraft.
8 billion dollars in GPS space- and ground-based systems through 2013 but the GAO expressed concern that "over the next several years many of the older satellites in the constellation will reach the end of their operational life faster than they will be replenished.
8 billion dollars in GPS space- and ground-based systems through 2013 but the GAO expressed concern that "over the next several years many of the older satellites in the constellation will reach the end of their operational life faster than they will be replenished.
British forces are evaluating the Pilar in Iraq, Germany has ordered two ground-based systems for evaluation and Belgium has bought 75 systems to install on its new Mowag Piranha IIIs.
Missions that require large amounts of maneuvering and transfer of mass, like space-based ground attack, are poorly suited to space and generally are not competitive with ground-based systems.
Although orbiting telescopes such as Hubble do not have this atmospheric problem, they also do not have the light-gathering capabilities of the large ground-based systems.
