The present document specifies technical characteristics and methods of measurements for the following equipment used in ground-based ATC Surveillance for civil air navigation: • Wide Area Multilateration (WAM) systems with Mode S capabilities which may include Mode A/C, transmitting at 1 030 MHz and at 1 090 MHz, and receiving at 1 090 MHz, used for air traffic control with or without 1 090 MHz phase overlay.
IN_DEVELOPMENT
prSSH EN 303 489 V1.1.1:2026
40.20
DIS ballot initiated: 12 weeks
Apr 27, 2026
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