Kitts wrote:
PIO's?
Pilot induced oscillations ...
CL> I would just run with --fdm=null and pass in the
CL> data that you do have. Optionally you can compute estimates for things
CL> you don't have just to make the display prettier.
Optionally i can compute? How? Is it not the FDM that does all that
computation?
The thing you have to remember about the FDM's is that they are self
contained units that maintain their own internal state. They aren't
setup to have their internal values overridden by an external source,
and there are issues and problems doing that. For instance if you
estimate some sequence of positions over a second or two, but you were
hit with a gust and ended up a long ways off from the estimate, now you
plug those new values into the FDM, it sees a huge distance travelled
compaired to the estimate in a very short time frame, and might generate
huge forces that could ripple through the future calculates and throw
your estimates off even further.
You almost need a way to check point the calculations so you can backup
to the last known good value when your next good data arrives.
It's not trivial, there are a ton of pitfalls, and our FDM's aren't
setup to be able to do that.
Having said that, I don't think any of these things are insurmountable,
and there might even be easy solutions to many of the challenges, but
you'd have to go dig into the flight model code with a certain level of
understanding of what you are doing and what you hope to accomplish
before you are going to have any success with this approach.
I have used 3 devices till date to achieve wireless link. I have used RF
modules from Linx
(http://www.linxtechnologies.com/index.php?section=products&category=rf_modules&subcategory=es_series),
BIM1 modules from Radiometrix
(http://www.radiometrix.co.uk/products/bim1.htm) and XStream radio modems
from maxstream
(http://www.maxstream.net/products/xstream/module/9xstream.php).
Of the three, the maxstream module is what i currently use as it has
provided me with the most reliable link and longest range. I have however,
had reasonably good success with the BIM1 modules. It however requires
robust error checking algorithms for reliable use. These have the advantage
of being light weight and giving pretty good range.
Where can I find a price or someone selling the maxstream module? I'm
must be missing the link, or do they not sell to individuals?
Curt.
--
Curtis Olson http://www.flightgear.org/~curt
HumanFIRST Program http://www.humanfirst.umn.edu/
FlightGear Project http://www.flightgear.org
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