Recently, the US military is planning to develop a "laser-charged" drone that will be developed based on bats and insects, and will be powered by lasers. If successful, these drones will remain empty even after landing. flight.
Recently, it is reported that the US Department of Defense is planning to develop a "bat" drone powered by "laser charging". When it comes to the application of laser technology in the military field, people will first be associated with hard killing systems and effectiveness such as air defense, anti-missile and blinding, but in fact, laser technology also plays a role in radar detection, energy transmission and other aspects. . So how does the "laser charging" technology affect the operational performance of future drones? This article will explain this for you.
â–² Bat robot developed by Caltech
According to reports, the new laser-powered drone developed by the US Department of Defense will be developed based on bats and insects. This type of unmanned track has more flexible flight performance, but unlike the biological prototype, after the laser charging (also known as "laser charging") technology is further improved, these drones can stay in the air without even landing.
This novel design, which looks like science fiction, has actually been successfully practiced six years ago. In July 2012, Lockheed Martin (hereinafter referred to as "Loma")'s "skunk factory" and laser power company jointly developed a fiber-optic power supply system, launching a free electron laser beam system for long distances. New technology for laser energy transfer.
â–²Loma "Stalker" drone
The data shows that the system has completed the ground wind tunnel test, including the use of ground-based laser charging system in the wind tunnel, for the "stalker" hand-throwing single soldier (this type of machine is "skunk factory" Specially developed for the US Special Warfare Command, it was put into service in 2006, with a maximum life of more than 2 hours, a practical ceiling of 4,600 meters, and more than 80 combat operations in Afghanistan. The test was not only successful, but also successfully increased the flight time of the UAV to more than 48 hours, and the endurance capacity expanded by 24 times. A month later, the Loma website reported that they had completed a series of outdoor flight tests of the laser-charged "latent" drone to verify the feasibility of the technology.
â–² Ground-based laser charging system is a schematic diagram of the application of "laser charging" for in-flight drones
Outdoor tests have shown that laser charging systems can transmit energy to "latent" drones in daylight and night conditions without being affected by strong winds and high temperatures (tests are specifically selected in remote deserts). During the test, the "latent" installed a lightweight optoelectronic receiver and power management hardware to receive laser charging up to 600 meters.
In the laser energy transmission, the system can control the accuracy of the beam tracking and positioning receiver to the centimeter level, not only will not damage and affect the normal flight operation of the "latent", but also does not affect the drone's hovering, climbing, etc. Maneuvering flight. Fiber laser charging technology, because the fiber itself does not conduct electricity, do not worry about lightning or short circuit, and will not interfere in high voltage and strong magnetic field environment.
â–² laser charging type "stalker" drone application diagram
The only drawback of the system is that the laser charging system is bulky and needs to be installed in a motor home. At present, Loma Company claims that their goal is to reduce the charging system to only "2 suitcases" size for the special team members to carry.
In addition to the individual fixed-wing UAVs, in May 2013, the United States also carried out laser charging tests for four-rotor UAVs in vertical take-off and landing situations. The charging system of the nickname "invisible tower" can use the laser to charge the drone under any conditions. Under the condition that the ground-based charging system has sufficient energy, the drone can be continuously flew.
â–²Information picture: Four-rotor UAV for laser charging test.
In addition to the United States, Russia also completed the laser charging test in October 2016. According to the Russian News Agency, the Russian "Energy" Rocket Space Company successfully used the laser charging system to charge the mobile phone 1.5 kilometers away within one hour.
The test was mainly carried out between two buildings, one of which was the building of the "Energy" company located on the outskirts of Moscow. In the test, the tester installed a laser charging device on the 6th floor of the building and installed a light guide plate with a total length of 10 cm on the roof of another building 1.5 km away (accurate sensing of the laser) And access to the charging port of a conventional mobile phone, which can convert laser energy into electrical energy by means of specialized instruments. Russian personnel said in an interview that the technology will be used for remote charging of aerospace equipment such as drones or satellites in the future.
â–²Russia laser charging test schematic
It can be seen from the experiments in the United States and Russia that laser charging technology has great potential for development in the future military and aerospace fields. It is foreseeable that one of its greatest applications in the future is to extend military drones almost infinitely. Life time (limited by the laser energy of the platform). Once the technology of the laser charging device is perfected and its size is greatly reduced, the device can be installed on armored vehicles, warships and even transporters to “charge the air†for the unmanned aerial vehicles in flight, just like today’s aerial refueling. .
â–² The US military's vision for future laser charging technology can be used to charge a drone with a flying height below 4572 meters through a ground-based laser charging system, or a high-altitude flight above 6096 meters through a charging system equipped with a battleship. Monitor the airship charging.
Unlike aerial refueling, the laser recharging system can not only recharge multiple UAVs at the same time, but also eliminate the need to maintain the formation or fixed-line flight of the UAV, which will undoubtedly greatly enhance the operation of the UAV and the charging platform. Flexibility and battlefield survivability.
In addition, the laser charging system not only supplements the drone with fuel for flight, but can even include weapons, such as the energy required for directed energy weapons. Perhaps in the near future, the group of drones that were conceived in the past science fiction movies without landing, and that can continue to fight for many days will become a reality, and people will wait and see.
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