SIMUFLY.COM Discussion Forums - local velocity transformations

Apr 30^th, 2025, 2:29pm

	Welcome, Guest. Please Login or Register
	News: CIVA Version 1.60 X64 for Prepar 3d 4.x now available

Home

Help

SIMUFLY.COM Discussion Forums › Delco Carousel IV-A INS For Microsoft Flight Simulator › Delco Carousel IV-A INS For Microsoft Flight Simulator › local velocity transformations

(Moderator: Marco Ravanello)

‹ Previous topic | Next topic ›

Pages: 1

Send Topic

local velocity transformations (Read 51 times)

Naruto-kun

Forum Member

Offline

Posts: 3
South Africa
Gender: male

local velocity transformations
Dec 4^th, 2012, 7:09am

Hi guys

So...Im working on a Litton LN-94 INS...And Im having a devil of a time trying to find/figure out the math to convert local velocities into world velocities to get my position in the inertial reference frame. Is there anyone here who can help me out?

Thanks
JB
P.S. Marco or Gianfranco if one of you two would be willing to help me out I will happily donate my time to any other INS projects you may have...since i have several aircraft that require various INS systems in the works.

« Last Edit: Dec 17^th, 2012, 7:37pm by Naruto-kun »

IP Logged

Marco Ravanello

Forum Administrator

Offline

Posts: 309

Gender: male

Re: local velocity transformations
Reply #1 - Dec 13^th, 2012, 2:48pm

> convert local velocities into world velocities

Sorry but I don't understand what you really meant.

A really GREAT starting point is this -> Multimedia file viewing and clickable links are available for registered members only!! You need to

Register!!

I'm sure you'll find there the solution of most of your INS-development-related problems or, at least, I hope so.

And if you have more questions feel free to ask!

IP Logged

Naruto-kun

Forum Member

Offline

Posts: 3
South Africa
Gender: male

Re: local velocity transformations
Reply #2 - Dec 16^th, 2012, 9:27pm

Well that does help when you know your current position (even if it is flawed due to lag) and want to get bearings/distances to a steerpoint or make an offset from a steerpoint but im finding it a bit hard to apply when it comes to determining my position using XYZ velocities in conjuction with attitude and heading....Im trying to figure out the inputs and outputs of directional cosine matrices but so far to no avail.

« Last Edit: Dec 16^th, 2012, 9:33pm by Naruto-kun »

IP Logged

Gianfranco Corrias Member Offline Posts: 261 Gender:	Re: local velocity transformations Reply #3 - Dec 16^th, 2012, 10:22pm are you speaking about an INS(INERTIAL NAVIGATION SYSTEM)??? Regards Gianfranco
Back to top	IP Logged

Naruto-kun Forum Member Offline Posts: 3 South Africa Gender:	Re: local velocity transformations Reply #4 - Dec 17^th, 2012, 8:48am Yep
Back to top	IP Logged

Marco Ravanello

Forum Administrator

Offline

Posts: 309

Gender: male

Re: local velocity transformations
Reply #5 - Dec 17^th, 2012, 4:32pm

> determining my position using XYZ velocities in conjuction with attitude and heading

This cannot be done in FS, basically because it's not a real time software (nor Windows is) and consequently the very precise calculations you would like to perform would bring you to very wrong results.

I initially tried your approach while developing CIVA but I soon reverted to a much easier method which offers almost the same realistic result

IP Logged

Pages: 1

Send Topic

‹ Previous topic | Next topic ›

« Home

‹ Board