Drones

The term drone refers to an unmanned aerial vehicle (UAV), although the more precise term is RPAS, Remotely Piloted Aircraft System. This designation covers the entire drone system, including the aircraft, navigation systems, radio control, monitoring systems, and other components.

A drone is an aircraft that flies without a crew and is operated remotely. It is therefore an unmanned vehicle capable of autonomously maintaining controlled and sustained flight, and it may be powered by an electric, combustion, or jet engine.

Drones are pilotless aerial devices controlled remotely through a radio-frequency system and guided and stabilized by GPS and an inertial system. They are generally controlled by a person on the ground, but they can also be programmed to fly fully automated missions and routes with remarkable precision and minimal error.

Drone designs come in a wide variety of shapes, sizes, and characteristics. Although they were initially conceived as flying vehicles, maritime and ground drones also exist, with aerial drones remaining the most common.

In terms of movement, some variants are controlled from a remote location, while others follow autonomous flight paths based on pre-programmed plans. Their physical design can also vary. Some resemble airplanes, while others resemble helicopters. The latter can remain stationary in the air and are known as quadcopters, hexacopters, or octocopters depending on whether they have four, six, or eight propellers.

A drone operates in essentially the same way as an airplane or helicopter: the motors are started and the control surfaces or rotors enable flight. The operator then directs movement using the controls. Performance depends greatly on the pilot’s knowledge and skill, although an autonomous flight-path sequence can also be configured.

Characteristics

A drone operates through complex technology that controls motor thrust, maneuverability, flight, stability, and position using GPS and an electronic compass.

Commercial drones are relatively small and lightweight. They are often made from carbon-fiber materials, making them strong, robust, and light. They generally include an anti-vibration system for more stable and safer flight.

The propulsion system usually consists of four, six, or eight motors arranged radially. These motors are managed by a flight controller that regulates acceleration, lift, forward movement, and turning maneuvers. Some designs can even keep the device airborne if one motor fails.

Lift is generated by the thrust of the propellers, which provides the force required to keep the drone in the air. By accelerating some motors more than others, the controller produces forward and backward movement and turns.

Radio frequency is used to control the drone’s flight and most of its actions, including raising and lowering landing gear, triggering the camera, selecting flight modes, takeoff, and landing.

Depending on its size, number of motors, and thrust, a drone can carry different payloads. Flight time is limited by battery capacity and the total weight of the device.

An interesting feature is headless mode, which makes piloting easier, particularly for beginners, and helps prevent mistakes or accidents. It allows the drone to be controlled from the ground regardless of the orientation of its reference front relative to the pilot. For example, when the pilot commands the drone to move left, it moves left regardless of whether it is facing toward or away from the pilot.

Classification

There are several ways to classify drones. In most cases, these categories are not mutually exclusive.

By Use

• Military: The first drones, as unmanned aerial vehicles, were used during the Second World War. Today they are used to simulate aircraft or carry out attacks, perform missions that may be highly dangerous, conduct reconnaissance, and transport cargo, among other purposes.
• Civil/Commercial: Used to explore inaccessible areas, produce photographic reports and aerial video, deliver packages, distribute signals, control fires, support rescue operations, conduct agricultural surveying, and even serve as recreational toys.

By Wing Type

• Rotary-wing: The most widespread type for both recreational and professional use. Also known as multicopters, they are highly versatile because they take off and land vertically from almost any surface and can carry a wide range of cameras.
• Fixed-wing: Drones that generate the forces needed for flight through their aerodynamics. Their design resembles radio-controlled airplanes and they are commonly used to map large areas because of their long endurance. Their main disadvantage compared with rotary-wing drones is that they cannot hover over a fixed point and generally cannot take off vertically on their own.

By Operating Environment

• Aerial: Unmanned flying vehicles generally controlled remotely from the ground. They may resemble airplanes, offering long endurance and speed, or helicopters, offering high precision during takeoff and landing.
• Maritime: Unmanned vehicles capable of moving on or beneath the water. Some are designed for surface travel, while others operate underwater, either with a guide cable or fully autonomously. They can support research and rescue tasks and are particularly useful for reaching certain depths of the seabed.
• Ground: Vehicles with objectives similar to aerial and maritime drones, but with designs adapted to terrain. They are used to explore areas that people cannot reach safely, including toxic, radioactive, extremely hot or cold, and confined environments.

By Control Method

• Autonomous: Drones that do not require a remote pilot to control their flight. They are equipped with systems that allow them to plan and execute a route without human intervention and usually include GPS positioning for real-time location.
• Remotely controlled: Unmanned vehicles operated through a radio controller handled by a pilot. This is the most common control method.
• Supervised or monitored: A middle ground between autonomous and radio-controlled drones. They can perform certain actions autonomously while remaining under a pilot’s supervision.

Regulations

From a civilian perspective, drones provide significant benefits to many industries, governments, and the general public. As with many disruptive innovations, however, full implementation takes time because of widespread concern that uncontrolled use could create serious risks. This has led to efforts to establish strict regulation.

Like any technologically sophisticated device, drones can also be misused, which makes their security important. Key measures to consider include:

• Comprehensive regulations for unmanned devices should be enacted to address potential risks to safety and personal protection.
• Controls should prevent obvious safety hazards, such as collisions with commercial aircraft, crashes into crowds, or contact with power lines.
• Control reviews should prevent unauthorized use, require encrypted communications, use software specifically designed to mitigate cyberattacks, support forensic monitoring, and include incident-response procedures.
• If drones collect or store confidential data, requirements for confidentiality, integrity, and availability should be applied in the same way as within a corporate data center.

Many experts expect civilian drone use to surpass military use. Important factors when operating a drone include the device’s weight, the activity to be performed, and whether its use is recreational or professional.

Three categories of recreational and commercial drones are commonly recognized by weight: micro, up to 2 kg; light, from 2 to 25 kg; and heavy, over 25 kg.

Many countries have regulations establishing minimum and maximum altitudes for commercial drone flights over people, provided that specified height requirements are maintained to reduce the risk of accidents. Maximum altitude and horizontal distance from the pilot may also be regulated.

The drone operator is responsible for accidents or damage caused by the device. Operators may be required to carry third-party liability insurance, and in many cases drones must be operated during daylight unless special authorization for night flights is obtained.

Cybersecurity is generally considered one of the most important concerns in the technology world, yet the security of drones and the applications used to control them is often overlooked. This area requires particular attention if the technology is to remain viable.