China claims to have mastered laser-powered drones, enabling drones airborne indefinitely, replacing military satellites in some scenarios

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China claims to have mastered laser-powered drones, enabling drones airborne indefinitely, replacing military satellites in some scenarios​

Optics-driven drones can be recharged while in flight and have AI-driven potential to replace costly and vulnerable military satellites
By GABRIEL HONRADAJANUARY 10, 2023

Concept art of a ground-based laser powering a quadcopter drone. Photo: Twitter / Drone DJ


Chinese researchers have invented a way to keep drones airborne indefinitely by recharging them with laser beams, which may one day enable drones to complement or replace military satellites in some scenarios.

This week, South China Morning Post (SCMP) reported that scientists from Northwestern Polytechnic University (NPU) fitted drones with photoelectric conversion modules that could convert light into electricity, enabling high-powered laser beams to power the drones remotely while in flight.

The report notes that the team from NPU’s school of artificial intelligence conducted a drone experiment that combined autonomous charging with intelligent signal transmission and processing technology.

“Highlights of the research are 24-hour intelligent vision tracking system and the autonomous long-range energy replenishment for optics-driven drones (ODD),” the team said in their official WeChat account, as cited by SCMP.

SCMP noted that the researchers mentioned that the first challenge they encountered was tracking the drones in the air. The source notes that the team was able to develop an algorithm based on intelligent visuals that could accurately track ODDs in the air.

The team also overcame the challenges of laser distortion and weakening due to atmospheric conditions and distance by using adaptive beam shaping technology that reportedly can autonomously adjust laser intensity, SCMP says.

Regarding safety features, the SCMP report says that the team added a protection algorithm that automatically adjusts laser intensity to safe levels once an obstacle is detected in its path.

The research team did not disclose specifics of their experiment due to its sensitive military applications, though it did say it had successfully conducted indoor follow-up, outdoor daytime and outdoor night flights.

China can use ODD drones to create a “low altitude satellite” or “artificial moon” and increase the combat effectiveness of drone swarms, the SCMP report said.

Meanwhile, the US has its own projects to power drones with lasers. In July 2022, The Warzone reported that the US is exploring converting aerial refueling tankers into “airborne energy wells” to recharge battery-powered drones.

The report said that the US Defense Advanced Research Projects Agency requested that same month industry feedback on converting the US Air Force’s existing KC-135 and KC-46 Pegasus tankers with an “underwing beaming pod.”

The Warzone article mentions that the pod should contain a continuous-wave laser that can generate at least 100 kilowatts, have a thermal control unit and be able to cover a “nearly hemispherical field of regard,” to make sure it can charge drones where needed.

The report also cited other requirements for the airborne energy well concept, such as the need to generate more power aboard tanker aircraft with new or existing equipment.

In a September 2018 article, The Byte reported the US Army is developing a ground-based system that can power up drones in mid-flight at 500 meters.

The report said that the system aims a laser precisely at a photovoltaic cell mounted on the drone, which converts light into electricity. However, it notes that any excess laser energy not converted by the photovoltaic cell turns into heat, which can severely damage the drone.

Laser-charging drones face various technological hurdles. In a 2022 article in the peer-reviewed journal Micromachines, Syed Mohsan and other writers enumerate the challenges of powering up drones with lasers. They note that water, dust and air temperature can degrade the performance of lasers and that they grow weaker over distance.

Nevertheless, such technology may be used in drones as stand-ins for satellites. Asia Times has reported on China and Russia’s fielding various anti-satellite weapons, such as microwave-armed satellites, mobile anti-satellite missiles, and electromagnetic pulse (EMP) weapons, and that the US is developing advanced anti-satellite weapons such as ground-based lasers, signal jammers and hunter-killer satellites.

These developments mean outer space is no longer a sanctuary for military satellites, which are costly to launch and difficult to repair or replace when damaged or destroyed.

Drones, on the other hand, are much cheaper to launch, operate and maintain than satellites. They are a feasible option to ensure multi-layered battlefield communication infrastructure, acting to reinforce, provide redundancy or in some situations replace satellite-based command, control, computers, communications, cyber, intelligence, surveillance, and reconnaissance (C5ISTAR) capabilities.

Given those developments, high-flying solar-powered drones may soon be a feasible replacement for military satellites, with laser charging potentially giving drones nearly unlimited endurance.

A 2016 article by Futurism notes that such drones, called “high-altitude pseudo-satellites (HAPS),” can perform all the functions of current satellites but at a lower cost.

The report notes HAPS have longer operating times than satellites and need to land only for maintenance and upgrades. It notes that these drones can be used for military monitoring, emergency communications, and high-speed internet.

One such drone is the Zephyr made by Airbus. It has a 25-meter wingspan and can fly continuously for months at an altitude of 21,000 meters, placing it above weather conditions and commercial air traffic. Airbus touts the Zephyr as capable of providing mobile connectivity to underserved or remote areas, earth observation and secure tactical communications.

Not to be outdone by Zephyr, in September 2022, SCMP reported that China unveiled its Morning Star 50 HAPS drone, which experts describe as a “pseudo-satellite.” SCMP notes that Morning Star has a 50-meter wingspan that is twice the size of the Zephyr, flies at altitudes above 20 kilometers, and can stay airborne for months or even years.

China claims to have mastered laser-powered drones - Asia Times

Chinese researchers have invented a way to keep drones airborne indefinitely by recharging them with laser beams, which may one day enable drones to

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[beijingwalker]

China Develops ‘UAV-Compatible’ High-Energy Laser Beams Not To Shoot Drones But To Power Them To Fly ‘Forever’ – Reports​

ByParth Satam

January 21, 2023

A team of Chinese researchers from Northwestern Polytechnical University (NPU) has successfully powered a drone using high-energy laser beams, effectively keeping it in the air “forever.”

Ironically, this is also one of the rare instances where Directed Energy Weapons (DEW) like lasers, usually used in anti-drone systems to bring down unmanned aerial vehicles (UAV), are purposed towards keeping them afloat.

The technology has significant military applications and potentially revolutionizes how drones are designed and used in warfare and for civilian applications.

The elimination of an onboard power source because of the wireless energy transfer frees up space for many other systems with various applications.

But most importantly, the nearly 24-hour endurance offers limitless options and flexibility in areas like disaster management, traffic management, and search and rescue during floods, landslides, and avalanches.

Next Stage In Wireless Transmission Of Energy?​

The South China Morning Post (SCMP) reported the development by the team led by NPU’s Professor Li Xuelong, who decided to approach the “drone-laser relationship from another angle.”

They sought to fit a drone with a photoelectric conversion module (or a solar panel) that converted light energy into electricity and used a high-energy laser beam to track and power it remotely.

“The team from NPU’s school of artificial intelligence, optics, and electronics said a recent experiment had successfully combined the autonomous charging process with intelligent signal transmission and processing technology – demonstrating the unlimited endurance potential for optics-driven drones (ODD),” the SCMP report said.

The experiment achieved a “24-hour intelligent vision tracking system and the autonomous long-range energy replenishment for ODD,” according to a statement posted on the team’s official WeChat account last week.

To overcome the first challenge of being able to track the drones while the drones are airborne, the team developed a tracking algorithm. This code was based on intelligent visuals to follow and accurately predict ODD targets while they flew.

The algorithm reasonably withstood the problems faced by illumination, scale, and rotation, was robust in different environments, and precisely tracked the exact positions of the drones.

But the next phase was the highlight. To increase the range at which power could be transmitted wirelessly, the scientists needed to reduce the “attenuation” a traditional laser beam undergoes in the atmosphere.

They introduced an adaptive beam-shaping technology that could autonomously adjust its intensity. Put differently – the team overcame the problem when obstacles like air turbulence and atmospheric conditions like density or smoke obstructed the laser. It can be safely said that the intensity of the laser beam can be increased or decreased when faced with such obstacles.

This improves the effectiveness and reliability of long-distance laser energy delivery. A protection algorithm was also added to the system, which automatically regulates the laser’s intensity to a safe range once an obstacle is detected in the beam’s path.

However, details regarding the system’s range and photoelectric conversion efficiency have been withheld, given its military utility.

A computer-generated image in the report suggested an ODD could fly as high as a skyscraper. The system was flown in three field tests: indoor follow-up flight, outdoor daytime flight, and outdoor night flight. The drones operated successfully in all scenarios.

A computer-generated illustration of the optics-driven drone (ODD) by China’s Northwestern Polytechnical University (NPU)

Similar To A British System​

A similar system being developed by the UK, reported previously by the EurAsian Times, was also based on the same principle but focused on laser-based control rather than energy transmission.

The Free Space Optical Communications (FSOC) by the UK-based technology and defense aerospace company QinetiQ involved a ground-based operator controlling a UAV.
It sent control commands and received sensor and platform information through the Free Space Optical Communications (FSOC) – a bi-directional link in its ground control and communication system.

This came against the backdrop of reports about Russian Electronic Warfare (EW) successfully jamming and bringing down many UAVs used by Ukraine. The vulnerability of drones like the Turkish TB-2 Bayraktar was bared when EW systems could easily sever the radio communications/control links connecting the UAV and the ground control or jam satellite navigation signals.

The British technology’s laser control signal transmission nullified such Counter-Unmanned Aerial Systems (C-UAS) as they operated in an RF spectrum. The Chinese autonomous ground-to-air wireless charging could also be paired with the achievements in drone swarm controls by the China Electronics Technology Group Corporation since 2020.

But like the UK system, the report about the NPU technology does not mention whether the ground-based laser energy transmission platform needs to be within a line-of-sight distance from the drone, its portability, and weight.

It likely presents a significant handicap, especially in military applications, as the ground system must always be close to the drone. Neither is there any clarity about the power source for the laser itself, as lasers need significant electricity.

Although in a nascent stage, it appears to be a promising technology and would need a lot of refining.

China Develops 'UAV-Compatible' High-Energy Laser Beams Not To Shoot Drones But To Power Them To Fly ‘Forever’ - Reports

A team of Chinese researchers from Northwestern Polytechnical University (NPU) has successfully powered a drone using high-energy laser beams, effectively keeping it in the air “forever.” Ironically, this is also one of the rare instances where Directed Energy Weapons (DEW) like lasers, usually...

eurasiantimes.com