On Wed, 30 May 2007 22:36:57 -0400 "Ampere K. Hardraade" <[EMAIL PROTECTED]> wrote:
> > If I were to build an instrument on an actual aircraft for measuring ground > speed, I would use an accelerometer and integrate its output. > > So, following this concept, you could implement this in Nasal by using the > following algorithm: > 1) implement a data type for holding the velocity and simulation-time for the > current frame. Then, push the instance of the data type into a queue every > frame. (The queue can be found here > http://cvs.flightgear.org/cgi-bin/viewvc/viewvc.cgi/data/Aircraft/A380/Systems/FDX/Switch/queue.nas?revision=1.1&view=markup) > > 2) Go through the queue and dequeue instances that are X seconds old. Then, > calculate the delta_t between two instances and multiple the value by the > acceleration in one of the instances. > > 3) Summing up all the results in step 2 and dividing the result by X should > give you the ground speed. > > I hope this helps. :D > > > > Ampere Thanks Ampere , thats another way to go .... Its just that it is calculated in gps / route-manager ... it seems to be re written several times , so it would be nice to have a single usable property to work with .... at least thats my current line of thinking .... but I may give up and go the Nasal route , if this doesn't work ... I'll keep your method in mind :) Cheers, Syd -- syd & sandy <[EMAIL PROTECTED]> ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
