The 1030/1090 MHz applications see its performance degraded when airborne transponders are interrogated beyond their designed capability and performance. Potential reasons include too many radio frequency (RF) interrogations on 1030 MHz triggering, too many replies from aircraft transponders on 1090 MHz, unexpected transmissions, or non-interoperability issues.
The RF spectrum protection of the 1030/1090 MHz frequencies and the monitoring of the performance of surveillance avionics are regulated by article 6 of EU regulation No 1207/2011 of 22 Novakober 2011 (Surveillance Performance and Interoperability) and article 7 of EU regulation 2019/123 of 24 January 2019 (Network Functions).
EUROCONTROL assists all stakeholders to ensure that their surveillance requirements are taken into account and that aeronautical surveillance using 1030/1090 MHz remains fit for purpose, now and in the future. EUROCONTROL delivers sound technical recommendations working closely with an extensive range of civil and military stakeholders, including air navigation service providers, aircraft operators, industrial partners as well as International Organisations and standardisation bodies.
Military operators can also contribute to alleviate and gain control of the potential 1030/1090 MHz RF congestion by taking into account a number of particular technical characteristics and usage of specific military systems.