GPS is accurate to within 10-15meters with a hand held Garmin or Magellan, to get much better than 7m (autonomous) you need data from a ground based base station. (5mm is possible with a survey grade system, and a base station within 10km)
Europe is building their own system called Gallileo (deployment for 2005), Russia still has it's Glonass system flying. A major contractor for the European system is Novatel out of Calgary Canada (go figure)
In 2005 three more channels will be available from the next generation of American SV's so accuracies should improve.
GPS signals are difficult to but not impossible to fake. Most high grade receivers include anti-spoofing technologies to minimize this threat. it could be blocked but not easily faked
ADS-B is supplemental to exisiting radar systems, so it should improve exisitng navigation, as long as governments dont get lazy and give up on radar stations.
I don't know much about GPS in aviation, but I am a little surprised that this type of system does not already exisit.
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GPS is accurate to within 10-15meters with a hand held Garmin or Magellan, to get much better than 7m (autonomous) you need data from a ground based base station. (5mm is possible with a survey grade system, and a base station within 10km)
Europe is building their own system called Gallileo (deployment for 2005), Russia still has it's Glonass system flying. A major contractor for the European system is Novatel out of Calgary Canada (go figure)
In 2005 three more channels will be available from the next generation of American SV's so accuracies should improve.
GPS signals are difficult to but not impossible to fake. Most high grade receivers include anti-spoofing technologies to minimize this threat. it could be blocked but not easily faked
ADS-B is supplemental to exisiting radar systems, so it should improve exisitng navigation, as long as governments dont get lazy and give up on radar stations.
I don't know much about GPS in aviation, but I am a little surprised that this type of system does not already exisit.