F-35C spotted at night from 61.5 km: China's lidar model challenges stealth

TVS News AI, editorially supervised, presents F-35C spotted at night from 61.5 km: China's lidar model challenges stealth.

Chinese researchers have modeled a lidar system supposedly capable of detecting an F-35C stealth jet at night from up to 61.5 kilometers away. By day, the range is reportedly significantly smaller. This is reported by Focus Panorama.

What looks at first glance like a technical breakthrough against the F-35C is, so far, primarily a theoretical calculation. Nothing has been measured or tested yet. Still, a look at the physics helps explain why the model performs much better at night than during the day.

At night, the laser detector is supposed to reach significantly further than during the day.

How lidar is supposed to work against a stealth aircraft

Lidar stands for "Light Detection and Ranging." The system fires short laser pulses that reflect off the target and are captured by a sensor. It calculates distance from the travel time of the light. Unlike radar, it uses electromagnetic waves in the optical range — light rather than radio waves.

Stealth jets like the F-35C are optimized to absorb or deflect radar radiation. Against laser light, that optimization only partially applies: the F-35C's coating, edges, and fuselage shape reflect laser pulses differently than radar signals. That's exactly what makes it a target for lidar.

Why more range is possible at night

During the day, the sun lays down a permanent blanket of light that overlays the weak reflections from the lidar. At night, that background noise disappears — weaker echoes become readable again, and effective range increases. The model calculation by the Chinese researchers is built precisely on this: the system is supposed to see almost twice as far in darkness as during the day.

The 61.5-kilometer figure stands and falls with the assumptions baked into the model. Atmospheric conditions, weather, flight altitude, flight profile, and receiver sensitivity all play a role. The specific values the researchers used in the calculation are not apparent from the Focus report.

What the model doesn't answer

The F-35C is the carrier-based naval variant of the U.S. fighter jet. It flies comparatively slowly compared to classic fighters, often at low altitude over water — conditions that can be modeled cleanly with clear assumptions. Whether the system in a real-world scenario would actually pick up a jet in a dive, during maneuvers, or with its full stealth coating deployed is a different question.

Until then, the 61.5 kilometers is primarily a number in a model calculation — eye-catching enough to reignite the debate over the limits of today's stealth technology. The field test is missing.