On 10/23/09 02:40, James Turner wrote: > .... I want to add > a realistic mode, where the GPS indicated position had some error / > lack of precision.
> What do people suggest? Please take a look at this data: http://www.av8n.com/fly/img48/gps-random-walk.png The data looks reasonably realistic, i.e. reminiscent of real GPS data I've seen. The model is very simple and robust: -- The acceleration is a random number, uniform on a bounded interval. -- The velocity is the integral (running sum) of the acceleration. We use a _leaky_ integrator so that the velocity remains bounded. It is a moderately smooth function of time. -- The position is the integral (running sum) of the velocity. Again we use a leaky integrator so that the position remains bounded. It is a smooth function of time. If you want to play with the parameters, you can use this spreadsheet: http://www.av8n.com/fly/gps-random-walk.xls I'll let you write the c++ code; it's only a few lines. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
