[time-nuts] Re: Role of GPS for Kalman Filter

[Lux, Jim]

On 2/2/23 11:13 AM, Mayukh Bagchi via time-nuts wrote:
> Hello all,
>
> I am new to the world of sensor fusion and Kalman filters and especially working with GPS. I am trying to build a precise position reference package comprising a GPS module ( yet to be finalized, suggestions are welcome),  accelerometers, gyroscopes, and magnetometers. The idea is to interface all of these with a Pi and run a sensor fusion (Kalman filter ) script to fuse all of these data to get a Lat, long, and True North, East, and Down.
>
> I am trying to achieve a cm level precision. The package will be flying on a balloon about ~30 km up in the stratosphere. I have talked to a few GPS companies that provide correctional services (RTK) at such altitudes but I am not sure if that kind of investment is worth it. Basically, I am trying to understand the contribution of a good GPS toward the Kalman Filter.


One important question - do you need precise location in real time, or 
is post processing later sufficient?

The other important question is for the attitude information - how 
precise? arc seconds? degrees? 1 radian? - and again, post processing, 
or in real time.