800-Meter Lock on Stealth Targets: The Construction of the PLA's Three-Layered Anti-Stealth Defense Network

On February 13, the official account of the PLA Daily disclosed an incident where a fighter jet from the Eastern Theater Command achieved radar lock on a foreign stealth aircraft at a distance of 800 meters. This brief news item can easily be interpreted as another piece of propaganda suggesting that the J-16 can engage the F-22, but in reality, this 800-meter figure reveals a more pressing issue—when stealth aircraft have already entered visual range, locking onto them is not difficult; the real challenge lies in how to achieve initial detection from 100 to 200 kilometers away.

What Does 800 Meters Mean?

800 meters is almost face-to-face distance in aerial combat. A fighter jet cruising at 0.8 Mach can cover this distance in just 3 seconds. Within this range, even top-tier stealth aircraft like the F-22 can be seen directly by the pilot with the naked eye.

According to publicly available technical data, the J-16 is equipped with the Type 1475 Active Electronically Scanned Array (AESA) radar, which has a detection range of about 300 kilometers for conventional third-generation aircraft (with a radar cross-section (RCS) of approximately 3-5 square meters). However, for stealth targets like the F-22, which has an RCS of only 0.0001-0.001 square meters, the theoretical detection range drops sharply to under 100 kilometers—this is still under ideal conditions.

So the question arises: if the J-16's onboard radar struggles to detect stealth targets at long distances, how did PLA pilots know the enemy's position in advance and successfully close in to 800 meters?

The Real Challenge of Anti-Stealth Is Not in the Air

A key piece of information that was not disclosed in this incident is the role played by the ground command system. Clues can be found in a similar case reported by CCTV in October 2025—at that time, it was mentioned that "ground-based anti-stealth radar and airborne early warning aircraft helped detect the approaching aircraft and transmitted tracking data to the Li Pengfei formation."

In simple terms, the J-16 pilots did not find the target through "blind search" with their onboard radar; rather, the ground and airborne early warning systems first detected the approximate location of the stealth target and then guided the fighter jet to intercept. This is the true operational mode of the PLA's anti-stealth system.

Three-Layered Defense Network: Coordinated Detection from Space-Based to Airborne

Based on publicly available technical information in recent years, the PLA's anti-stealth system can be divided into three layers:

First Layer: Space-Based Satellite System (Detection Range: Global Coverage)

In October 2025, Chinese scholars published a paper in the Journal of Radar, revealing a new type of space-based synthetic aperture radar (SAR) technology that claims to be able to track stealth targets 24 hours a day. Even earlier, the commercial satellite "Jilin-1" successfully captured images of the F-22 maneuvering within cloud cover.

The advantage of the satellite system lies in its wide coverage, unaffected by the curvature of the Earth, but it also has clear disadvantages: poor real-time capability (fixed satellite orbits and long revisit cycles), and limited positioning accuracy (with errors on the order of kilometers), making it unable to provide direct guidance for missiles.

Second Layer: Ground-Based and Sea-Based Early Warning Systems (Detection Range: 400-600 Kilometers)

The PLA has deployed a large number of JY-27A, YLC-8B, and other meter-wave/decimetric wave anti-stealth radars along the southeastern coast. The working principle of meter-wave radar gives it immunity to stealth coatings—the F-22's stealth design primarily targets X-band and Ku-band radars, with limited effectiveness against meter-wave bands.

However, meter-wave radar also has a fatal weakness: poor angular resolution, which can only provide a rough direction of the target without precise localization; weak anti-jamming capabilities; and inability to provide fire control-level tracking data for missiles. A detail that is easily overlooked is that at the 2024 Zhuhai Airshow, a promotional video for the YLC-8B radar displayed by China Electronics Technology Group indicated a detection range of "450 kilometers" for "a certain type of stealth aircraft"—note that it used "detection" rather than "tracking," as the two terms have essential differences in military terminology.

Third Layer: Coordination Between Airborne Early Warning Aircraft and Fighter Jets (Detection Range: 150-300 Kilometers)

The AESA radars equipped on early warning aircraft like the KJ-500 and KJ-2000 have far superior detection capabilities compared to a single fighter jet. More importantly, early warning aircraft can illuminate targets from multiple angles, such as from the side or high altitude, while the RCS of stealth aircraft is not uniformly low from all directions—while the frontal RCS of the F-22 is very small, its side and rear RCS can significantly increase.

Once the ground radar provides a rough position, the early warning aircraft can move closer (to 100-150 kilometers) for secondary confirmation, then guide the J-16 and other fighter jets to the final interception position. In this process, the task of the fighter jets is not to "search," but to "intercept"—this explains why pilots can lock onto targets at a distance of 800 meters.

The Asymmetry of Costs in Systemic Confrontation

This three-layer system sounds perfect, but there is one issue: cost.

According to publicly available bidding information, the cost of a JY-27A meter-wave radar is approximately 80 million to 120 million RMB, while the unit price of the KJ-500 early warning aircraft is about 1.5 billion RMB. To establish effective coverage along the thousands of kilometers of coastline in the Eastern Theater Command, at least 20-30 ground-based radars and 6-8 early warning aircraft would need to be on standby regularly.

The greater cost lies in personnel and training. Ground radar operators need to identify complex signal characteristics, early warning aircraft commanders must make guidance decisions within minutes, and fighter pilots need to fly blind for dozens of kilometers without radar lock—any mistake in any link can lead to the failure of the entire interception.

What is the cost of a single sortie for the U.S. F-22? According to the U.S. Air Force's fiscal year 2024 data, the cost of flying per hour is about $70,000. If it is merely circling near the Chinese coastline, forcing the PLA to deploy early warning aircraft, fighter jets, and activate ground radars, who ultimately finds this more cost-effective?

A Question That Remains Unanswered

Among the details disclosed by the PLA Daily, one key piece of information has been deliberately obscured: where did this interception take place?

If it was off the coast of Fujian, then the ground radar network could provide ample support; if it was in the deep sea area east of the Miyako Strait, far from the continental shelf, then reliance would have to be on early warning aircraft and sea-based vessel radars—the latter's detection range and reliability would be compromised.

What is truly worth noting is not whether the PLA can intercept stealth aircraft at its doorstep—this is not difficult with the support of the ground radar network. The more critical question is: when conflicts occur beyond the first island chain, far from the coverage of ground radars, what level of anti-stealth capability can the PLA maintain?

This is the real challenge behind the 800 meters, one that was not written into the news release.