EN 303 489 V1.0.0 is a brand new standard currently out for voting! It covers Wide Area Multilateration (WAM) in air traffic surveillance and systems operating at 1030 MHz and 1090 MHz. The standard defines technical requirements to ensure these systems can coexist with other radio services without causing interference. It is a harmonised standard regulating access to radio spectrum in this domain.

You can find the standard here: EN 303 489 V1.0.0

You are welcome to comment by 4th of august.