China has modeled a laser sensor that could detect an F-35 stealth fighter from up to 38 miles at night. The headline comes from a simulation, however, not a demonstrated missile system.
The South China Morning Post reported that the China Airborne Missile Academy, an institution tied to the PLA Air Force’s air-to-air missile work, studied a missile-mounted single-photon lidar. The paper, led by Li Zhiyuan, appeared in the peer-reviewed Chinese journal Aero Weaponry on September 18. Its best result was 61.5 kilometers in ideal nighttime conditions. Daylight reduced the modeled reach to 27.7 kilometers.
Nothing in the study shows that the device has been built, tested in flight, or installed on an operational missile. That caveat changes the claim from a fielded breakthrough to a promising but unproven calculation.
The laser only needs a few returning photons
The proposed workaround targets a weakness the researchers believe stealth aircraft have: lasers may face fewer dedicated defenses than radar or infrared sensors. The model used a 1,064-nanometre wavelength. Instead of relying on a large radar return, single-photon lidar sends laser pulses and measures the very small amount of light that comes back.
Researchers placed low-power 1.0-millijoule pulses and a compact 100mm lens in the missile’s nose. Their calculations included detector dead time, sky glow, atmospheric scatter, and detector noise. The system needed an 8.8-decibel signal-to-noise ratio, or at least 9.4 returning photons, to lock on. At 27.7 kilometers, the model placed the target within 20 centimeters in depth and 50 centimeters across.
That is impressive on paper: roughly ten returning photons could separate an F-35 from background clutter. But the paper did not test clouds, rain, or a maneuvering jet, and it did not show how the sensor would perform on a missile moving several times faster than sound.
The beam has a targeting problem
The biggest objection is the beam’s narrow field. One military analyst told the SCMP it would be more like a rangefinder than an early-warning radar, meaning the missile would need a rough idea of where to aim first. Another expert familiar with military hardware simply said the concept was technically difficult to understand.
Range comparisons add another problem. The F-35’s AIM-9X short-range missile is listed at about 16 to 32 kilometers, so the lidar’s 61.5-kilometer nighttime result would reach beyond it. But longer-range air-to-air missiles can strike beyond 160 kilometers, more than twice the lidar’s nighttime distance and almost six times its daylight reach. In that scenario, the aircraft could detect and attack the launch platform before the laser produced a useful track.
China has also publicized more distant theoretical concepts. In early 2025, researchers at the Changchun Institute of Optics, Fine Mechanics and Physics simulated a stratospheric airship infrared sensor reaching 1,800 kilometers from behind or the side, and about 350 kilometers head-on. The pattern is clear: the larger the claimed range, the more dependent it is on simulation rather than an operational system.
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Why It Matters
At stake is the difference between a return found in a controlled model and a combat-ready way to locate a stealth aircraft. That gap matters to anyone judging whether the announcement changes the balance between hiding and finding. The study offers a clever sensing idea, but its unresolved practical problems are central. A narrow beam must be directed toward the right area, while the reported calculations do not cover the weather, motion, and high-speed conditions that could disrupt a real engagement. The open question is whether a missile could use this signal early enough to search, track, and threaten an F-35 before the aircraft or its weapons put the launch platform at risk.
That is why the range number cannot stand alone. Detection distance has value only when paired with a way to search a wide area, maintain a lock, handle clouds and rain, and survive the timing of an air-to-air fight. The broader pattern described in the source is continued interest in defeating stealth, from compact lidar to a much more distant infrared proposal. Yet neither simulation establishes an operational capability. Until the laser is built, flight-tested, and integrated with a missile, the announcement remains evidence of a theoretical possibility, not proof that the F-35 can be reliably found in combat.
Source: The Liberty Daily
