With regards to the ADXRS290, is there any empirical values for the following two parameters:
Thank you for your post. I don't believe that we have any group delay measurements, but I will see what I can find.
Normally, we try to keep each discussion in the Engineer Zone focused on one specific question, but I can help with the In-Run Bias Stability as well. Let me check with the ADXRS290 if they have any official plots for this. If not, we just finished a project that leveraged a similar core, so we can share what we found.
Thanks for the prompt response.
For gyroscope measurements as long as the phase delay of the filter is constant, the group delay will essentially be the time it takes for the signal to be processed through the filter i.e. it will be a time delay.
Since it is a "time delay" and I assume it will be constant, "time delay" can be measured in a "rate table"?
This gyro may be used as part of an IMU/GNSS system and therefore I will need to know exactly when a measurement was taken for synchronizing with other measurements.
Thanks for the feedback. From a "driving value" point of view, I understand where you are coming from, but none of the test methods (rate table, shock response, self-test response) meet the criteria of "exactly synchronized," so when we look at special requests like this, we hope to start with quantifiable objectives, which relate to managing specific, application-level behaviors. Is it safe to assume that by analysis, you can demonstrate why "<0.5ms," as offered in the ADXRS290 datasheet, is not good enough for the application you are working on?
If so, what level of delay is acceptable? While we understand that some margin is desirable, this is a difficult test to run. Rate tables and other motion-inducing equipment have their own mechanical frequency response profiles, which have variation that could contribute influential levels of error. I will give this some thought, but hope that you can help us quantify your objective a bit more precisely, so we can determine if it is observable with the methods and equipment that we have available or we are going to have to rely on a modelling approach.
Back to Question #2, let me offer a bit more detail. Which definition of group delay best fits your application?
Sorry the detailed response, but we want to make sure we are looking at this in manner that best reflects your needs, but also is efficient as possible, both for you waiting time and our resources. Thanks again!
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