Re: [Flightgear-devel] LANDING SIMULINK

[LeeE <le...@sp...>]

On Monday 10 March 2008 13:01, Curtis Olson wrote:
> On Mon, Mar 10, 2008 at 12:13 AM, Ampere K. 
<amp...@sy...> wrote:
> > Here might be a possible way for you to remove those jumps. 
> > You will need two
> > sets of observations.  One on the plane of course, and one from
> > the ground.
> > For the one on the ground, you will also need to know the
> > precise coordinates
> > of the receiver beforehand.
> >
> > The two receivers will experience jumps in their observations
> > simultaneously.
> > Subracting the data from the ground receiver by its precise
> > coordinates will
> > give you the jumps, which you can use to subtract the errors
> > from the observation of the plane.
>
> I'm not a gps guy, but I think differential gps systems work
> based on the phase of the signal and the stations select a common
> set of satellites for their solution.  We actually have a person
> a the UofMN working on a project where the two ends can be mobile
> and the system computes the relative distance between the two
> mobile station ... so you could plunk one end down at the end of
> your temporary runway for doing virtual ILS/precision landings. 
> But that still doesn't fully resolve that the real world ground
> elevation may not match exactly the elevation in FlightGear so
> there will always be some kind of discrepancy when rendering real
> flight data in a simulator ... especially when taxiing or
> touching down.
>
> Regards,
>
> Curt.

It's a pity that Wiimotes don't have the necessary range:)

LeeE