model selection,configuration with triaxial MEMS Accelerometers and single-axis Gyroscope(if do not have this,just triaxial MEMS Accelerometers with high zero offset is OK),and the zero offset of the Accelerometers high than 1mg.
Let me offer this a different way: IMU packaging provides flexibility that is not available at the component level, in terms of packaging and other optimization techniques. Therefore, we will not always be able to duplicate IMU-level performance in the smaller, lower-cost components.
Thank you for your post. I am very sorry about this, but I am not sure that I understand what you are asking for. Based on what I can see, 1mg might be achievable, under some conditions, but it is a bit challenging for this class of device so it might help to have more information on the conditions that you would need to preserve 1mg of bias error through. Can you clarify?
light weight and small size,temperature range:-20℃-85℃,The assembly consists of triaxial MEMS Accelerometers and single-axis Gyroscope(if the products can not meet this ,just triaxial MEMS Accelerometers is OK).but it must meet the requirement of 1mg of bias error.Can you provide some information of products that meet those conditions?
The ADIS16485 is close to meeting ~1mg over your temperature range but longer term drift appears to be ~30ug/sqrt(hour). So 1mg might require some periodic maintenance.
By the way, "light" and "small" are understandable values but aren't very helpful as selection criteria. How light? How small? Since your performance criteria dictates only one possible solution (ADIS16485), so there isn't much flexibility on those attributes.
Thank you very much!We want to use it in the exploration of coal mine，but temperature range:-20℃-85℃ is OK.We hope the module that is less than 30mm*30mm*30mm(or at least two of them are less than 30mm),and if the size is OK ,the weight as far as possible light is good(No specific requirements).The ADIS16485 is a little big,and in Data sheet,the Bias Repeatability is 3mg not 1mg?? Besides,we do not need Triaxial digital gyroscope,if there is no product that consists of triaxial MEMS Accelerometers and single-axis Gyroscope,Can you recommend suitables triaxial MEMS Accelerometers to me?
1mg of error, over all conditions, is well beyond what today's commercial tri-axis accelerometers can support Like I said in my last message, we only have one product that even comes close to what you're asking for, and it comes in a package that's larger than what you want and has tri-axis gyroscopes.
I'm sorry to bother you always.But i want to know that what the Bias Repeatability specific refer to ? Bias Repeatability for one day or Bias Repeatability for one month?Why the data sheet of some products do not have the zero-bias stability? And I want to know that why the accelerometer's error of MEMS Accelerometers is biger than the accelerometer's error of iSensor MEMS Inertial Measurement Units?
The datasheet explains where the Bias Repeatability comes from. Please see footnote 1.
The ADIS16485 does not offer a bias repeatability specification but I have been told that this particular accelerated aging profile projects behavior out to beyond 10 years. If we were to assume that the drift is proportion to the square root of time, this would extrapolate to ~10ug/sqrt(hour).
1 month = 24 hours x 30 days = 720 hours
Drift projection = 10ug/sqrt(hour) x sqrt(720 hours) = 268ug = 0.268mg
Does that help?
On this question, I am not sure that I understand what you think that we are obligated to provide component accelerometers that match the performance in our Inertial Measurement Units (IMU). Can you help me understand that?
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