Wrong airspeed in X-plane HIL
Prompted by Larry Grater, I investigated the airspeed that APM Mission Planner is pulling in from X-plane and handing to APM.
It appears that It is confusing X-plane's TAS with IAS. Seeing that APM will only know airspeed as indicated airspeed from a pitot-static system, it makes sense to me that the airspeed reported to APM should be indicated, not true.
Have I got this all wrong?
Does APM actually use the airspeed from X-plane? When I look at the configuration for my HIL firmware version, it already has the airspeed sensor selection ticked, so presumably this is supposed to be being simulated with data from X-plane
I've just installed the latest 1.1.36 to check if this error still exists and it appears so.
Replies to This Discussion
-
DeveloperPermalink Reply by Michael Oborne on -
ive modded this, give it a shot. it was infact tas, and is now ias
-
Permalink Reply by Andrew Rabbitt on
-
Thanks a heap Michael - I just spotted this update!
Funnily enough, in the real world at high altitude I think we need to have TAS for the speed scalar on the PID loops, but since we have only pitot as our IAS measurement, the IAS-TAS code needs to go into APM anyway.
I'll check out your new MP though.
A
Contests
Season Two of the Trust Time Trial (T3) Contest has now begun. The third round was a reliablilty/aerial photography round for both planes and copters, which is now closed. Stay tuned for the next round, beginning soon.A list of all T3 contests is here.
Top Content
Groups
-
DIYDrones - CNC Project
60 members
-
ArduPilot (legacy) User …
94 members
-
Moderators
57 members
-
ArduCopter (traditional …
115 members
-
UK Ardupilot Group
29 members
© 2012 Created by Chris Anderson.
