General support information

No, IMU does not have an aging compensation model.

The error of inertial navigation mainly comes from the inherent defects of inertial sensors, which increase in a quadratic (position) or linear (attitude) manner over time. The main reasons for the accumulation of errors over time are: gyro drift, accelerometer bias; the integration of accelerometer bias error can lead to velocity error, and the secondary integration can cause position drift (for example, a 1mg bias for 1 hour can result in a position error of about 60 meters); Temperature sensitivity; Installation error; The sensor coordinate system is not strictly aligned with the carrier coordinate system. Common methods for addressing error accumulation include: Multi-sensor integrated navigation: (1) GNSS/INS combination: periodically correcting the position and velocity errors of inertial navigation through GPS/Beidou and other satellite signals, suppressing long-term drift; (2) Milometer/Doppler radar assistance: vehicle odometer or radar speed information can constrain the speed drift of inertial navigation. Advanced filtering algorithm (Kalman filtering algorithm) real-time estimates and compensates for sensor errors (such as zero bias, scale factor). Suppress temperature drift through built-in temperature sensors and compensation algorithms. Reduce initial attitude error through static calibration during startup; And methods such as forcing the speed to zero and resetting the speed integration error when the carrier is stationary (such as when the vehicle is parked).

Yes, every IMU undergoes temperature compensation before leaving the factory. The temperature compensation range is the operating temperature range of the gyroscope and accelerometer, and varies depending on the product.

The calibration of IMU performance indicators such as Zero bias, scale factor, misalignment error, and temperature compensation were mainly carried out. The temperature compensation range is the operating temperature range of gyroscope and accelerometer, and the compensation range varies depending on the product. To ensure the stability and reliability of sensor performance. Zero bias repeatability testing to ensure consistency in product performance. Conducting high and low temperature, vibration and other environmental tests to ensure product reliability.

Users should choose an environment with minimal magnetic interference for installation and use. Try to place away from iron, nickel, magnets, engines, and other magnetic substances as much as possible. If there are these magnetic media around, please maintain a distance of at least 0.5m. To ensure optimal measurement performance of the product, non-magnetic screwdrivers and non-ferrous screws must be used during installation. It is necessary to strictly avoid strong magnetic substances such as magnets and motors from approaching within 10cm of the compass, as this may cause an irreversible decrease in the measurement accuracy of the compass.

Before leaving the factory, we will inspect every accelerometer product, and we will submit the test methodology and test reports for each product to the customer to ensure that the products meet their requirements.