20,741
edits
Implementing VNAV support in FlightGear: Difference between revisions
Jump to navigation
Jump to search
Implementing VNAV support in FlightGear (view source)
Revision as of 03:37, 1 December 2013
, 1 December 2013→Background
No edit summary |
|||
| Line 25: | Line 25: | ||
== Background == | == Background == | ||
{{cquote|Altitude constraints are a mess - in the short term, they are best avoided. Keep in mind the GPS code doesn't really do proper vertical | |||
navigation - it computes some data like the altitude change and climb/ descent rate for a leg, but I'm not sure if any real aircraft is | |||
driving the VNAV mode of an autopilot from it. | |||
It's definitely something I will look at, but it's tied up with some other features. At some point I want to support GPS precision | |||
approaches and then obviously all the VNAV logic will need to be properly cleaned up - right now it's been copied mostly unchanged from | |||
the original gps code. | |||
As always, user stories are good - what do you expect the behaviour to be from the route-manager? Just to track valid altitudes? For the | |||
autopilot VNAV to follow the altitude profile exactly? Something in between? | |||
This is also tied up with accurate enroute time calculations and calculating top-of-climb / top-of-descent information, it's quite a | |||
mess to unpick.<ref>{{cite web |url=http://www.mail-archive.com/flightgear-devel@lists.sourceforge.net/msg23986.html | |||
|title=New route manager? | |||
|author=James Turner |date= Thu, 08 Oct 2009 15:17:18 -0700}}</ref>|James Turner}} | |||
{{cquote| I don't think any aircraft AP supports vertical route navigation yet - and the route-manage itself only has partial support for editing waypoint altitude. There's no real obstacle - waypoints store an altitude (and speed), and the AP can read it, but nobody spent time making it work yet. Vertical modes (VNAV) also tend to depend more on fuel/load and engine performance data from the FMS, which is an area that's been lacking in FlightGear, | {{cquote| I don't think any aircraft AP supports vertical route navigation yet - and the route-manage itself only has partial support for editing waypoint altitude. There's no real obstacle - waypoints store an altitude (and speed), and the AP can read it, but nobody spent time making it work yet. Vertical modes (VNAV) also tend to depend more on fuel/load and engine performance data from the FMS, which is an area that's been lacking in FlightGear, | ||
so hard to model the climb and descent profiles meaningfully. <ref>{{cite web |url=http://forum.flightgear.org/viewtopic.php?f=40&t=13777&hilit=performance+vnav#p140230 | so hard to model the climb and descent profiles meaningfully. <ref>{{cite web |url=http://forum.flightgear.org/viewtopic.php?f=40&t=13777&hilit=performance+vnav#p140230 | ||