ADS-B

[McHammer]

Hello Everybody!


I hope somebody can help me.



Im a German student (sorry for my English) and currently writing a paper about “Rating or review sensor systems for airport surveillance”.



I would like to know: Did the ICAO certificated/ standardized ADS-B?
What about the quality of the GNSS-Data (GPS)? Can we rely on this satellites-data (e.g. 99,99%)? In my opinion ADS-B alone will be never used for Surveillance without any additional navigation technique, like radio navigation or MLAT. One big reason would be spoofing (security). Am I right?
Does any document exist about certification and the required quality of GNSS-data?


Isn’t it more common to send ADS-B via SSR Mode S (ES) or do some Aircrafts send via VHF-Datalink (VDL Mode 4)? 

I think frequency congestion will occur on big airports because every aircraft and vehicle will send via 1090Mhz, right?



Thanks a lot for any answer!


[DaveReidUK]

Originally Posted by McHammer

In my opinion ADS-B alone will be never used for Surveillance without any additional navigation technique, like radio navigation or MLAT. One big reason would be spoofing (security). Am I right? 


I suspect that the FAA would beg to differ, given that they are betting the ranch on ADS-B.

https://www.faa.gov/nextgen/

[McHammer]

I know they put a lot in it.. And i guess not just one lobbyist stands behind this whole ADS-B thing.. Are you convinced by ADS-B without MLAT or radio navigation??

[vector4fun]

FAA will keep a minimum network of VORs for many years yet.


FAA begins decommissioning VORs - AOPA

[MarcK]

ADS-B accuracy is a mixed bag. Using MLAT within a terminal area should be pretty good. Space-based receivers for oceanic routes is entirely dependent on the ADS-B accuracy. Ultimately, it will be a mixed bag depending on the area requirements. That would imply that unmonitored ADS-B is not sufficient, in itself, for collision avoidance.

[chevvron]

You will still need 'primary' radar surveillance in case a non ADS-B equipped aircraft is flying. I don't know the present number of aircraft equipped with ADS-B but it must be less than 50% when you take into account those aircraft for which it is non mandatory.

[DaveReidUK]

You will still need 'primary' radar surveillance in case a non ADS-B equipped aircraft is flying. I don't know the present number of aircraft equipped with ADS-B but it must be less than 50% when you take into account those aircraft for which it is non mandatory.

Or, as is being done in a number of parts of the world, you make Mode S mandatory and use Wide Area Multilateration (WAM) with no PSR backup. Armenia and Tasmania are a couple of examples that spring to mind.