Micro-Magic has launched the U503 series high-performance MEMS Inertial Measurement Unit, bringing fiber-optic gyroscope-class precision into a compact, rugged package engineered for operation in GNSS-denied environments.
The unit achieves a typical gyroscope bias instability of ≤0.03°/h alongside an angular random walk of ≤0.005°/√h, matching performance metrics traditionally associated with Fiber-Optic Gyroscope (FOG) technology. This capability enables long-endurance Unmanned Aerial Vehicles (UAVs) and Autonomous Underwater Vehicles (AUVs) to sustain extended high-precision pure inertial navigation following a loss of GPS signals.
For linear acceleration measurement, the U503 delivers an accelerometer bias instability of ≤3μg and a velocity random walk of ≤0.01 m/s/√h. Its low-noise, high-stability output makes the sensor module suitable for integration into high-precision Attitude and Heading Reference Systems (AHRS) supporting high-dynamic control loops.
To withstand demanding operating environments, the U503 is constructed with an aluminum alloy housing featuring an integrated shock-absorbing structure. The design supports continuous operation across a temperature range of -50°C to +80°C, provides resistance against shock loads up to 1000g, and outputs data over an RS-422 interface at rates up to 2000 Hz.
Measuring 70×70×30 mm and weighing 220g, the module retains the physical miniaturization and low power consumption characteristics of MEMS technology. The U503 series offers system integrators a compact alternative to larger, higher-power fiber-optic IMUs to improve navigation resilience across UAVs, unmanned ground vehicles (UGVs), and underwater robotics operating in complex or contested domains.
