What a great project. I wonder how the modern sensors stack up against the military version in times of jitter and drift, that might cause some surprises. Larger sensors have a lot of inertial filtering compared to smaller ones.

I also think that the MTBF target the original had will be vastly exceeded by this replica due to the reduction in component count, but it will probably be more susceptible to bitflips. But you won't be flying that high if you put this on a drone. Please post future updates.

Great points!

This is experimental,

We need to address MEMS vs mechanical gyro noise profile

Gain constants in the nav kernel were tuned empirically for the original sensor suite.

Then we got SEU yes :)

noted, though flying at 30m AGL as the Viggen did in low-level attack mode keeps the cosmic ray exposure manageable

Will write a handover doc for Saab, they can do the rest of the dev :)

Yes will post updates

(we run two other drone projects, uas-phone-swarm for iOS and Android

There is a public blog post on it. Patreon/Formerlab

Modern smartphones more powerful than the ck37 tech)

Flying smarthphones project introduced here:

https://www.patreon.com/posts/152446275

Public access

Some background reading:

https://www.saab.com/newsroom/stories/2017/december/datasaab...

PDF:

http://www.datasaab.se/Papers/Articles/Viggenck37.pdf

Now we got it on a %50-100 FPGA board.

Half the size of a credit card. I guess the original computer onboard was 12-15 kgs

Late in Sweden, back tomorrow (CET)