DASR

The Digital Airport Surveillance Radar (DASR), also known by its military designator AN/GPN-30 or government nomenclature ASR 11, is a terminal air traffic control radar system designed to replace older analog systems like the ASR-7 (AN/GPN-12), ASR 8 (AN/GPN-20), and ASR 9 (AN/GPN-27). This system detects aircraft position and weather conditions near civilian and military airfields, offering improved reliability, enhanced weather data (six levels of rainfall intensity), reduced maintenance costs, and digital data output for modern air traffic control displays. Operating in the 2.7 to 2.9 GHz frequency range, the primary surveillance radar component transmits electromagnetic waves with a peak power of 25 kW and an average power of 2.1 kW, utilizing a 1.41° beamwidth and a 12 RPM antenna rotation to achieve an instrumented range of 60 nautical miles (110 km) with a range resolution of 926 meters. The system also includes a secondary surveillance radar (beacon) and employs pulsewidths of 1 µs and 80 µs.

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