- #1
schaffmc
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I have the intrinsic noise PSD spec for Honeywell's QA3000 accels, and I need to find the velocity random walk due to noise to show that I'm within my allowable. The PSD is given in units of g^2/Hz vs Hz. I'm given a velocity random walk due to noise spec of 15 (micro-m/s)/rt(s) that I must be below.
If I was unaware of the specification, the way I would go about finding the velocity random walk is to integrate under the PSD curve and take the square root to find the acceleration noise level in g's, and then integrate that value with respect to my time period (.25s). That would give me random walk in micro-m/s, which of course is not the same units as the spec I've been given. I imagine that the reason velocity random walk is in these particular units is to manage its time-dependence, but I'm not sure how or why.
Can anybody provide insight into 1. why the units are what they are, and 2. how I would go about getting from my noise PSD to velocity random walk?
Thanks!
Melissa
If I was unaware of the specification, the way I would go about finding the velocity random walk is to integrate under the PSD curve and take the square root to find the acceleration noise level in g's, and then integrate that value with respect to my time period (.25s). That would give me random walk in micro-m/s, which of course is not the same units as the spec I've been given. I imagine that the reason velocity random walk is in these particular units is to manage its time-dependence, but I'm not sure how or why.
Can anybody provide insight into 1. why the units are what they are, and 2. how I would go about getting from my noise PSD to velocity random walk?
Thanks!
Melissa