Comparison of Mode S ES and UAT for ADS-B
| Protocol | Advantages | Disadvantages |
|---|---|---|
| Mode S ES | International standard Widely adopted | Requires changes to signal to provide ranging Frequency congestion (used by other aviation systems) |
| UAT | Provides PNT with minimal changes Higher data rates, more message data capacity Dedicated frequency | US standard, not as commonly used Intra-system interference |