RPAS – Remotely Piloted Aircraft System

An RPAS is a complete aviation system. It includes a remotely piloted aircraft (RPA), remote control station, and communication links. These components combined allow the aircraft to fly safely and transmit data.

RPAS : Core Concepts

RPA – Remotely Piloted Aircraft 

An RPA is the primary flying component of an RPAS. It refers to the actual aircraft that operates without a pilot onboard but under the control of a remote pilot.

UAV – Unmanned Aerial Vehicle

A UAV refers to an aircraft only, which is flown without a pilot inside. It often describes drones, but does not refer to the entire system.

Drone

Drone is a popular term used to describe UAVs and RPAS. It is not a technical or regulatory term.

Autonomous Flight

Autonomous flight refers to the pre-programmed instructions an aircraft follows with little or no real time input from the remote pilot. Some RPAS can switch between autonomous flight and manual control.

RPAS – System Components

Payload and Sensors

The payload includes the tools or equipment that an RPAS carries to accomplish a mission. This may be surveillance cameras, inspection tools, or sensors that detect datas such as motion or heat. Sensors measure physical information and turn it into data useful to the remote pilote or command center.

Telemetry and Data Link

Telemetry is the information the aircraft sends about its status, such as altitude, speed, and sensor data. The data link is the connection which sends commands to the RPAS and brings this information back to the pilot.

Transponder

A transponder is a device that allows the aircraft to be identified by air traffic systems. This helps
avoid conflicts with other aircraft in controlled airspace.

Reliability and Redundancy

Redundancy means integrating backup systems, such as additional sensors, power sources, or
communication links, allowing the system to continue operating if one component fails.

In an RPAS, redundancy improves overall reliability, meaning the system can operate consistently and safely even in the event of a malfunction or unexpected issue.

Flight Operations

VLOS – Visual Line of Sight

VLOS operations require the pilot to maintain visual contact with the RPAS. This is a common requirement for safe and regulated flight.

BVLOS – Beyond Visual Line of Sight

BVLOS flights occur when the RPAS operates beyond the pilot’s direct visual range. In this case, the flight depends on strong data links, reliable sensors, and continuous telemetry to ensure safe navigation.

Flight Planning

Flight planning is the process of preparing a drone mission before takeoff. It includes for example:

  • Defining the mission objectives
  • Selecting appropriate payloads and sensors
  • Setting the flight route and altitude
  • Verifying communication and data links
  • Checking weather and airspace restrictions
  • Ensuring compliance with operational and safety procedures.
Proper flight planning helps ensure the mission is efficient, safe, and aligned with regulatory 
requirements. 
 

Safety and Compliance

Health and Safety Management System

This is a structured set of procedures that helps operators protect people, equipment, and data during RPAS operations. It includes:

  • Conducting risk assessments to identify potential hazards.
  • Implementing mitigation measures to reduce risks.
  • Establishing emergency plans for incidents such as system failures or loss of control.
  • Defining standard operating procedures to ensure consistent and safe mission execution.

It also involves regular safety audits, crew training, and compliance checks to maintain high safety standards throughout all phases of flight.

Compliance

Compliance means following all rules, laws, and standards that apply to RPAS flight. This includes airspace regulations, pilot certification, and equipment certification.

Airspace and Regulation

ATM – Air Traffic Management

RPAS must operate in airspace managed by ATM systems alongside other aircraft. This requires coordination and communication to avoid accidents and helps prevent conflicts. UAVs equipped with surveillance cameras or other onboard sensors must therefore follow the same safety standards as manned aircraft.

RPAS – Applications and Use Cases

Surveillance and Monitoring

RPAS combine remote sensing, rapid deployment, and situational awareness, enabling safe and efficient operations. Key applications are for example :

  • Defense, ISR missions
  • Border monitoring
  • Public Safety
  • Event surveillance
  • Emergency response
  • Firefighting
  • Search and rescue
  • Infrastructure inspection
  • Wildlife tracking
  • Deforestation monitoring

Inspection and Mapping

Drones are used to inspect infrastructure, such as bridges, pipelines, or power lines. They can also map large areas by flying over them and capturing data with onboard sensors.

RPAS are complex aviation systems that combine remotely piloted aircraft, control stations, and communication links to operate safely and efficiently. They carry a variety of payloads and sensors, providing real-time data for applications in defense, public safety, environmental monitoring, and infrastructure inspection.

Successful operations rely on careful flight planning, redundancy, and compliance with airspace regulations and safety procedures. By integrating advanced technology with remote control, RPAS enable versatile, reliable, and safe missions across many industries.

Through RPAS like KHRONOS DroneBox, teams gain continuous aerial intelligence, persistent ISR (Intelligence, Surveillance, Reconnaissance) and enhanced situational awareness without the limitations of battery‑only flight.

Find out more about our Khronos Tethered DroneBox solution here : 

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