[Flightgear-devel] Groundspeed and MP radar
Hi all , I would like to add a groundspeed property to the autopilot route manager ... the calculations are already done in the source code , I would just like to output that to a property for the Primus 1000 FMS mode.GPS has an indicated -groundspeed , but I would prefer to use the route-manager for this ... any objections /suggestions ? Im also trying to do a 2d radar panel , using the radar x-shift and y-shift , which of coarse need scaling ... can scaling use a property ? Ive had no luck so far... 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Groundspeed and MP radar
syd sandy a e'crit : Hi all , I would like to add a groundspeed property to the autopilot route manager ... the calculations are already done in the source code , I would just like to output that to a property for the Primus 1000 FMS mode.GPS has an indicated -groundspeed , but I would prefer to use the route-manager for this ... any objections /suggestions ? Why not in /velocities ? (I used a Nasal to get a ground speed, I'll be happy to get ride of it :) Alexis - 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Groundspeed and MP radar
On Tue, 29 May 2007 22:49:44 +0200 alexis bory [EMAIL PROTECTED] wrote: syd sandy a e'crit : Hi all , I would like to add a groundspeed property to the autopilot route manager ... the calculations are already done in the source code , I would just like to output that to a property for the Primus 1000 FMS mode.GPS has an indicated -groundspeed , but I would prefer to use the route-manager for this ... any objections /suggestions ? Why not in /velocities ? (I used a Nasal to get a ground speed, I'll be happy to get ride of it :) Alexis Well , Ive thought of that too .researching these things leads me to believe that in real life (I could be wrong),groundspeed is calculated using a nav signal as a reference point , so it is only accurate if you are flying directly toward that point... But a /velocities/groundspeed could be used as a starting point ... -- 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Groundspeed and MP radar
On 05/29/2007 08:06 PM, syd sandy wrote: Well , Ive thought of that too .researching these things leads me to believe that in real life (I could be wrong),groundspeed is calculated using a nav signal as a reference point That's not right. Groundspeed is groundspeed. There's only one proper definition of groundspeed. An _approximation_ to groundspeed in terms of the rate of slant range made good to/from a navaid is sometimes encountered, for example in a _DME_ unit. This is considered a nonideality of the DME system, not a redefinition of groundspeed. This nonideality is never AFAIK exhibited by GPS or RADAR units. Every GPS and every RADAR I've ever seen or heard of, when asked to report groundspeed, reports honest-to-goodness groundspeed, independent of any route, independent of the relationship between the ground track and this-or-that navaid. , so it is only accurate if you are flying directly toward that point... But a /velocities/groundspeed could be used as a starting point ... It takes only a couple of lines of nasal to calculate the groundspeed in terms of the already-available properties. Hint: Aircraft/A-10/Nasal/aar.nas line 261 ... so I don't understand what the discussion is about. The Subject: line refers to groundspeed. If you want to ask about something else, perhaps about ETE or ETA at this-or-that station, then the answer might become route-dependent. (Different questions have different answers!) So: If there's a problem here that needs solving, please describe the problem more fully. - 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Groundspeed and MP radar
On Tue, 29 May 2007 21:36:55 -0400 John Denker [EMAIL PROTECTED] wrote: On 05/29/2007 08:06 PM, syd sandy wrote: Well , Ive thought of that too .researching these things leads me to believe that in real life (I could be wrong),groundspeed is calculated using a nav signal as a reference point That's not right. Groundspeed is groundspeed. There's only one proper definition of groundspeed. did you miss the (I could be wrong )?;) An _approximation_ to groundspeed in terms of the rate of slant range made good to/from a navaid is sometimes encountered, for example in a _DME_ unit. This is considered a nonideality of the DME system, not a redefinition of groundspeed. This nonideality is never AFAIK exhibited by GPS or RADAR units. Every GPS and every RADAR I've ever seen or heard of, when asked to report groundspeed, reports honest-to-goodness groundspeed, independent of any route, independent of the relationship between the ground track and this-or-that navaid. , so it is only accurate if you are flying directly toward that point... But a /velocities/groundspeed could be used as a starting point ... It takes only a couple of lines of nasal to calculate the groundspeed in terms of the already-available properties. Hint: Aircraft/A-10/Nasal/aar.nas line 261 ... so I don't understand what the discussion is about. Well I wasnt trying to start a war here ,simply trying to get my Primus 1000 system updated, but groundspeed is calculated in the source code , and since its been requested before , I thought it might be a good idea to show it in the property tree... I just dont see a reason for redoing everything in nasal that's already done in the source code The Subject: line refers to groundspeed. If you want to ask about something else, perhaps about ETE or ETA at this-or-that station, then the answer might become route-dependent. (Different questions have different answers!) So: If there's a problem here that needs solving, please describe the problem more fully. Like I said , it wasn't really a problem, it was a suggestion The only problem I see is the ai radar x-shift and y-shift that should REALLY be normalized to the radar range :) Have a nice day ... Cheers, Syd - 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel -- 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
