2026-10-12
The flight control system serves as the "brain" and core technology of UAVs. It mainly consists of key sensors including gyroscopes, accelerometers and barometric sensors together with control circuits. These sensors automatically maintain stable flight attitude of UAVs.
In recent years, breakthroughs and wide adoption of MEMS technology have brought integrated consumer UAVs into daily life. Commercial consumer UAVs commonly adopt MEMS gyroscopes and related sensors due to their small size, low cost and IC packaging capability.
The flight control system is the core of UAV technology, composed of sensors, onboard computers and servo actuators. It realizes three major functions: attitude stabilization and control, mission payload management and emergency control. Key sensors integrated in the flight controller include gyroscopes, accelerometers, barometers, ultrasonic sensors and GPS modules. Their primary function is to automatically maintain normal flight attitude.
Gyroscopes measure angular rate, namely the rotational speed around carrier axes. UAV systems generally deploy three single-axis accelerometers and three single-axis gyroscopes to build an Inertial Measurement Unit (IMU), which detects and measures UAV attitude in the air.
Accelerometers capture three-axis acceleration in the carrier coordinate frame, while gyroscopes measure angular velocity relative to the navigation frame. The IMU outputs 3D angular velocity and acceleration data to calculate yaw, pitch and roll attitude of the UAV.
The IMU transmits measured data to the main MCU. Combined with user commands, the MCU stabilizes flight motion through flight control algorithms.
High-performance inertial instruments form the foundation of advanced inertial navigation systems. Gyroscopes and accelerometers are the two core inertial components widely used in military airborne INS. With continuous upgrades of MEMS technology, aerospace inertial navigation systems are developing toward higher precision, miniaturization and digitization.
For instance, DARPA launched research on next-generation IMUs in March 2016. Multiple navigation research programs are underway to reduce military reliance on satellite navigation, aiming to realize positioning, navigation and timing using chip-integrated gyroscopes, accelerometers and atomic clocks.
An inertial navigation system usually includes inertial measurement devices, computers and display units. The inertial measurement unit contains accelerometers and gyroscopes. Three-degree-of-freedom gyroscopes measure angular motion of carriers, and three accelerometers capture linear acceleration. The computer calculates velocity and position based on these measurements.
Originally developed for aerospace, land and marine military applications, inertial navigation has become a core technology for modern defense systems, widely deployed in aircraft, missiles, ships, submarines and tanks. Falling costs and rising demand have expanded its use into civilian fields such as geodetic survey, resource exploration, geophysical measurement, ocean exploration, railway and tunnel engineering, as well as robots, cameras and toys.
The Mars 2020 rover carried the Mars Helicopter, a UAV relying on gyroscope signals for autonomous navigation. Mars lacks a strong global magnetic field and regular magnetic poles, so magnetic heading cannot be used as on Earth. Besides, no GPS-like satellite navigation network exists around Mars. Scientists designed an autonomous navigation scheme based on solar position and gyroscope measurements.
NASA planned up to five flights for this rotorcraft, with maximum single-flight duration of 90 seconds. Despite the conservative mission limits, it marked a milestone for deep-space exploration. Researchers noted that although named a helicopter, its underlying technologies share many similarities with high-tech terrestrial UAVs and may inspire future UAV delivery applications on Earth.
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