I'm no expert so there's likely to be a lot of mistakes in this post.
ADS-B - Automatic Dependent Surveillance - Broadcast, (out) transmits (in) receives position data from/to other aircraft and to ATC.
I've been trying to find out more about how congestion of the 1090MHz frequency will be addressed. It seems that ADS-B out is becoming fairly ubiquitous. Additionally, there will be more aircraft interrogating (on 1030MHz) and responding to interrogations on 1090MHz for transponder based systems (TCAS, SSR). From this post, it sounds like things are already congested in some areas.
Here are some of the things that I'm unable to google for so far:
- On the wikipedia page for TCAS, there is mention of a bandwidth limitations of 1 megabit/second. What does this mean?:
a) Within an airspace only 1 megabit/second of data can be transmitted cumulatively.
b) Air traffic control can only receive 1 megabit/second.
c) Individual aircraft can only transmit 1 megabit/second.
d) The receiving equivalent of c.
What is physically limiting bandwidth? Will there eventually just be too much interference between signals whilst using this frequency, or is it a hardware issue? I couldn't seem to google this issue, maybe I need some keywords.
Are the solutions to increasing capacity about being more clever with how the packets are sent (more efficient packet sizes, fewer packets, better/cleaner transmission), improving ground or air hardware, or is there a "add more lanes to the highway" solution? It seems 978MHz is equivalent to adding more lanes.
What is the consequence of congestion? Are packets corrupted as noise rises? What keywords should I google?
Also, thanks for all the useful info on this site, aced a Masters assignment recently because of the aircraft designers on here.