The Chengdu J-20 stealth fighter utilizes an active electronically scanned array (AESA) radar system integrated with infrared and electronic-warfare sensors [1].

This sensor suite is critical because it allows the aircraft to maintain long-range detection and high situational awareness while remaining difficult for enemies to detect. These capabilities are designed to ensure survivability when operating within contested airspace [1, 2].

Developed by the Chengdu Aircraft Industry Group and Chinese military aerospace researchers, the J-20 is operated from air bases and tested in research facilities throughout the People's Republic of China [1]. The integration of the AESA radar provides the aircraft with low-probability-of-intercept capabilities, which reduces the likelihood that the fighter will be detected by opposing radar systems while it is scanning for targets [1, 2].

Additional research and simulations from 2024 [3] suggest that the aircraft's effectiveness in combat scenarios varies based on support. Some simulations indicate that the J-20's success in dogfights against aircraft such as the F-22 Raptor depends on the presence of two or three drone wingmen to provide additional support [3].

By combining AESA technology with infrared search and tracking, the J-20 can identify targets without emitting radio signals that would reveal its position [1]. This multi-spectral approach allows the pilot to track targets through heat signatures and electronic emissions, a necessity for stealth operations in modern aerial warfare [1, 2].

“The J-20 stealth fighter utilizes an active electronically scanned array (AESA) radar system.”

The integration of AESA radar and infrared sensors represents China's effort to close the technological gap with U.S. fifth-generation fighters. By prioritizing low-probability-of-intercept and multi-sensor fusion, the J-20 aims to challenge air superiority in the Pacific. However, the reliance on drone wingmen for combat success suggests that the aircraft's standalone capabilities may still be inferior to those of the F-22.