Advanced Surface Movement Guidance and Control System (A-SMGCS); -- Part 6: Harmonised Standard covering the essential requirements of article 3.2 of the Directive 2014/53/EU for deployed surface movement radar sensors; Sub-part 1: X-band sensors using pulsed signals and transmitting power up to 100 kW (ETSI EN 303 213-6-1 V2.1.1 (2016-05))