With layered sensors and forward-based TPY-2 radars, the Ballistic Missile Defense System can engage the target more frequently and track and discriminate early, increasing the likelihood of a successful intercept. It can function alone or in tandem with other sensors, sending target data to the command and control system so that other sensors can use it.

In the forward mode, by placing itself in close proximity to possible launch sites, the AN/TPY-2 gives other assets access to missile tracking and discrimination data via the MDA’s C2BMC interface. The system’s short wavelength and antenna design enable it to image targets at high resolutions to differentiate targets from decoys and debris.

For instance, cueing data for Aegis and THAAD intercepts in MDA flight test FTO-01.16 was supplied by the radar in 2013. Moreover, the Missile Defense Agency effectively showcased the AN/TPY-2’s capability to guide a Patriot missile intercept in 2020.

When installed with THAAD, TPY-2 enters terminal mode, enabling it to identify missile threats throughout the terminal phase of its trajectory and offer fire support for intercepting missiles.

When in terminal mode, TPY-2 collaborates directly with THAAD to provide fire control operations against short- and medium-range ballistic missiles as they approach their target by monitoring, detecting, tracking, and discriminating. After identifying and monitoring a terminal-phase danger, TPY-2 assists THAAD’s firing control operations by deploying an interceptor guided by TPY-2 to intercept the targeted missile.

The US has deployed the radars and THAAD batteries that use them in multiple locations across the world, based on the threat perception. It is noteworthy that all US adversaries have vociferously opposed the deployment of THAAD or Aegis BDS close to their territories.

Not only does this radar render their missile launches “useless,” but it is believed that it could also relay information on missile programs inside these territories and launch elaborate and extensive surveillance missions.

However, China has become the flagbearer of this opposition. The deployment of the THAAD missile defense system in South Korea was fiercely condemned by Beijing due to suspicions of foul play.

China’s & Russia’s Opposition

THAAD is an anti-ballistic missile defense system designed to shoot short-, medium—, and intermediate-range ballistic missiles in their mid-course and terminal phases (descent or re-entry) by intercepting with a hit-to-kill approach.

A full THAAD battery comprises six launchers, a fire-control unit, the THAAD system’s AN/TPY-2 radar, and a support unit. The US has maintained that it has deployed THAAD in South Korea to counter North Korean missile threats.

China initiated a strong campaign against the deployment, not out of fear that a THAAD battery would target its missiles. The THAAD system only intercepts missiles in their final stage, so it would not pose a threat to Beijing unless it was to launch a ballistic missile toward South Korea.

The AN/TPY-2 radar system, part of THAAD, raised concerns in Beijing as it can monitor missile launches within a radius of 1,500 to 2,000 kilometers if targeted at China. Operating in the X-band of the electromagnetic spectrum, this radar was criticized by China for potentially being used as a surveillance tool rather than for defensive purposes.

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China objected to Seoul’s choice to install THAAD systems in South Korea in 2016, even imposing trade and cultural sanctions that resulted in substantial economic losses.

Analysts have observed that the deployment has posed a challenging problem for China, which is concerned that the radar’s advanced capabilities could enable the US to conduct surveillance on Chinese missile activities.

The United States has also deployed the radar to Japan in addition to South Korea, causing China to react somewhat disproportionately. According to publicly available information, the radar has been stationed in Japan to gather intelligence at the strategic level regarding North Korean missile advancements and to alert Japan to the presence of approaching warheads. Russia’s border with Japan can also be scanned by the AN/TPY-2 radar in the Shariki area.

THAAD and its radar can accept cues from Aegis, satellites, and other external sensors to extend their coverage area. They work in concert with Patriot/PAC-3 missiles and the Command, Control, Battle Management, and Communications (C2BMC) system.

Incidentally, China is not the only adversary rattled by the AN/TPQ-2 radar. When Ukraine asked the US for a THAAD battery to bolster its air defense against Russian air strikes, sources in Moscow warned Washington to avoid stupidity and not deteriorate the situation further.

An unknown source told Russian state media TASS: “Ukraine has turned to the US with a request to deploy several battalions of THAAD mobile anti-ballistic missile defense launchers with radars near Kharkiv on Ukrainian territory. An AN/TPY-2 radar that makes part of the THAAD system is capable of tracking the aerospace situation over a substantial part of Russian territory and will enable Kyiv and its NATO allies to ‘look deep’ into the territory of Russia to a distance of up to 1,000 km.”

An AN/TPY-2 was also deployed in Alaska as part of the United States national missile defense development. This prompted a strong reaction from President Vladimir Putin, who stated in 2017 that the presence of a US anti-missile system in Alaska and South Korea presented a challenge to Russia.