Contact_tower From Norway, joined Sep 2001, 536 posts, RR: 1 Reply 1, posted (9 years 8 months 2 weeks 6 days 1 hour ago) and read 4902 times:
ADS = Automatic Dependent Surveilance. A joint term for the systems where a transmitter in an aircraft transmits it's GPS position to a com sattelite (or ground station), allowing "radar-like" surveilance all over the globe. CPDLC is a part of some ADS systems, but not all. CPDLC have been seen as a replacement for VHF/HF radio coms over oceans etc.
Foxbravo03 From Ireland, joined Mar 2004, 38 posts, RR: 0 Reply 4, posted (9 years 8 months 2 weeks 5 days 17 hours ago) and read 4870 times:
I've noticed that the ADS/CPDLC system seems to be used more by the airlines than General Aviation traffic.The GA guys continue to rely on voice reports for their position reporting on HF.Is there any reason for this?
Thank you for your replies so far.
Philsquares From , joined Dec 1969, posts, RR: Reply 7, posted (9 years 8 months 2 weeks 3 days 8 hours ago) and read 4821 times:
Just a comment on Ba229's statement about "old pilots that don't like it". Being an "old pilot" feel I can comment. I don't think it is an issue of not liking it, or even not willing to change, I think it, atleast for me, is an issue of what the trade off is.
The nice thing about VHF communications is you have a "party line". You can hear other transmissions, you can build a mental picture of where everyone else is around you. It helps situational awareness.
I am all for decreasing pilot workload. In this day and age, it's ridiculous to go across the Pacific or other parts of the world and have to rely on HF as your primary form of communication.
I have used FANS for a number of years and love it, I just wish there was some way keep the information coming into the cockpit to keep us situationally aware of the traffic in your area.
FredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26 Reply 9, posted (9 years 8 months 2 weeks 1 day 13 hours ago) and read 4793 times:
Just one point. The aircraft will transmit to the ground and each other directly, in a TCP/IP-ish kind of wireless network. No satellites involved once the position has been determined.
I do hope that the datalink comms will enable you to see all the traffic in the surroundinds, with messages concerning your own flight highligted. Theoretically, you could even make it user configurable. "I want to see ATC comms for all aircraft within altitude block xxx-yyy and within an n mile radius". Wouldn't that be neat?
Of course, once you have the display you already know as much about the situation as ATC without listening in on the comms...
I thought I was doing good trying to avoid those airport hotels... and look at me now.
Philsquares From , joined Dec 1969, posts, RR: Reply 10, posted (9 years 8 months 2 weeks 1 day 10 hours ago) and read 4789 times:
Actually, the CPDLC used in the FANS system does use satellites to rely the data link to a ground station. If I remember correctly, it's the INMARSAT system that is used.
I beg to differ again with BA229. It was very informative listening to Shanwick or Gander while people got their oceanic clearance. You knew who was where in the track system and what altitudes people got. Now, it's just the non data link a/c that get the clearances over VHF. In addition, if the FAA has their way, they would like to use CDPLC in the terminal area.
Several years ago, I did some volunteer work at the NLR to look at the applicability of CPDLC. IFALPA and U.S. ALPA funded the study. The results were very interesting. They were given to the FAA and ICAO. Sadly, it looks as if the FAA didn't read the study.
RobK From United Kingdom, joined Sep 2004, 3942 posts, RR: 19 Reply 11, posted (2 years 7 months 4 days 22 hours ago) and read 3682 times:
Sorry to bump a 7 year old thread but this seemed like an appropriate place to post my question as it's related. So we know what CPDLC and ADS comms are, but what is FMC and how does position reporting in OCAs work with that?