Propulsion Systems:
Control Boards, Stabilizers, Positioning 

Flight Control Board

Drones have components that detect where it is, and keeps it stable and on course during flight. 


Flight Controller: The brain of a drone; has sensors to give it information to properly orient itself


Gyroscopes: detect changes in a position of a drone and re-adjust its position 100s of time every second using inertial measurement units (adjusts yaw, pitch, roll movements)


Gyroscopic Rigidity: physical principle allowing an auto-pilot  function to self-stabilize 


Magnetometer: is a compass. Can be fooled by metal objects or electrical objects. Must be calibrated in new locations. 


Accelerometer: determines position and orientation of drone

Image Source: https://www.fierceelectronics.com/components/how-many-sensors-are-a-drone-and-what-do-they-do

Image Source: https://pic-microcontroller.com/st-has-mems-gyro-for-more-than/

Positioning

Drones also have transmitter components that communicate with satellites; these allow the drone to transmit a GPS signal. 


GPS System: calculates latitude and longitude (lateral/horizontal measure). Required for autopilot features. 


Antenna: Small wire that receives signals 


Automatic Dependent Surveillance–Broadcast: works by broadcasting information about an aircraft's GPS location, altitude, ground speed and other data to ground stations and other aircraft, once per second


Image Source: https://technodossier.com/understanding-drones-components-applications/