Q: Why does IMU20 6dof IMU become so hot selling product?
A: 1) IMU20 6dof IMU is chip-based inertial measurement unit, which has been widely used in unmanned vehicles, smart agriculture, AGV, etc., and now the sold qty can reach 30k per year 2) since we produce IMU20 in big qty, so IMU20 IMU module can enjoy ultra-cost-effective, which assure that it can be widely used. 3) IMU20 can be pin to pin compatible with ADIS16505, and we can provide faster delivery, usually we have them in stock, we only need to do the tests before delivery. 4) we can provide customized design for IMU modules, so that make the IMU module more suitable for your application, we can provide the most flexible solution to our customers. 5) IMU20 IMU module provide the most reliability, its quality has been proven by the leading companies in China.
Q: How to keep IMU20 6dof IMU bias calibration good after time? What a procedure?
A: In fact, before we do the high and low temperature compensation and turntable calibration, we have done ESS in the high and low temperature box for 48 hours to release the environmental stress and ensure that the stress deformation is as small as possible. But after a long time, 10 months or a year later, due to the characteristics of the MEMS sensor itself, the performance may have little change. At this time, if the customer has high accuracy requirement, they can return to our factory for calibration again.
Q: if turning off the fusion algorithm that IMU20 China 6dof IMU supplier itself has, can be the output frequency of IMU80 up to 500Hz?
A: if without internal algorithms, it can reach 500Hz, if with algorithms, only can reach 200Hz, cause the inside MCU has limited computing ability.
Q: What is IMU20 working temperature?
A: The test temperature is -40 to 85 °, and the actual temperature may exceed 85 ° when testing high temperature. Actually, during the test, we kept IMU20 stay at both -40° and 85° for an hour
Q: What is an IMU sensor?
A: An inertial measurement unit (IMU) is an electronic device that measures and reports a body’s specific force, angular rate, and sometimes the magnetic field surrounding the body, using a combination of accelerometers and gyroscopes, sometimes also magnetometers.
Q: What does inertial measurement unit measure?
A: Inertial Measurement Units (IMUs) is a self-contained system that measures linear and angular motion usually with a triad of gyroscopes and triad of accelerometers. An IMU can either be gimballed or strapdown, outputting the integrating quantities of angular velocity and acceleration in the sensor/body frame.
Q: What is the Terms Definition for Navigation?
A: Inertia is the property of bodies to maintain constant translational and rotational velocity, unless disturbed by forces or torques, respectively (Newton’s first law of motion). An inertial reference frame is a coordinate frame in which Newton’s laws of motion are valid. Inertial reference frames are neither rotating nor accelerating. Inertial sensors measure rotation rate and acceleration, both of which are vector‐ valued variables. Gyroscopes are sensors for measuring rotation: rate gyroscopes measure rotation rate, and integrating gyroscopes (also called whole‐angle gyroscopes) measure rotation angle. Accelerometers are sensors for measuring acceleration. However, accelerometers Cannot measure gravitational acceleration. That is, an accelerometer in free fall (or in orbit) has no detectable input. The input axis of an inertial sensor defines which vector component it measures. Multi‐axis sensors measure more than one component. An inertial measurement unit (IMU) or inertial reference unit (IRU) contains a cluster of sensors: accelerometers (three or more, but usually three) and gyroscopes (three or more, but usually three). These sensors are rigidly mounted to a common base to maintain the same relative orientation.
Q: What is Basic principle of inertial navigation?
A: the ability to measure the acceleration of vehicle it would be possible to calculate the change in velocity and position by performing successive mathematical integrations of the acceleration with respect to time. In order to navigate with respect to our inertial reference frame, it is necessary to keep track of the direction in which the accelerometers are pointing. Rotational motion of the body with respect to inertial reference frame may be sensed using gyroscopic sensors that are used to always determine the orientation of the accelerometers. Given this information it is possible to resolve the accelerations into the reference frame before the integration process takes place.
Q: What is Aircraft Axes Definition?
A: The three axes of the aircraft are: The roll axis which is roughly parallel to the line joining the nose and the tail Positive angle: right wing down The pitch axis which is roughly parallel to the line joining the wingtips Positive angle: nose up The yaw axis is vertical Positive angle: nose to the right
Q: How about the delivery time?
A: for our standard model, if we have them in stock, only need 2~3days to re-test before shipping, if it is out of stock, then need around 2 weeks to arrange the production and tests. For the ODM electronic product, if needing to modify the structure, it will need around 3~4 weeks to arrange the production and tests.
Q: How to arrange the payment?
A: about the payment, please pay to our company account, the beneficiary’s name: NANJING SKY MEMS TECHNOLOGY CO., LTD. And our email is only @skymems.com to contact with u formally. To notice this to avoid the loss. 
