AP_Scripting: add Plane autoland applet

[Hwurzburg]

Facilitates having an autoland FS mission setup for flying from fields without prior planning(or computers).....sets up an autolanding sequence based on takeoff direction....

https://youtu.be/Y8Hn5h5h-3s?si=d7UuL5IL1rAcW1ZM

[Hwurzburg]

yeah, I thought about that but forgot....will wrap it

[Hwurzburg]

@timtuxworth yeah I lost the mission reset somewhere along the way...made a few tweaks also...felt I needed the user to consciously set the SCR_USER params instead of providing a default if they did not...

[Rolf-G]

I have read the instructions 10 times, but have not yet understood how exactly the landing direction is determined ? (I don't mean in the LUA script, but actually in flight operations)

[Hwurzburg]

Ahrs has a get yaw function that returns vehicle heading....it's captured when valid and used to create the final approach waypoint in line with takeoff direction

[Hwurzburg]

I test flew on compass-less plane with strong wind...both into the wind and at 90deg crosswind....in both cases the created final approach waypoint was placed in line with throw direction....much better crosswind performance than waiting for LVL_ALT, since by then the yaw has weathervaned into the wind rather than being the initial throw/roll-out direction...

https://youtu.be/nd9rq2448Hw

[tridge]

I think an autotest that checks we end up close to home and pointing in the reverse direction (within a margin) of the takeoff direction would be worthwhile

[Hwurzburg]

An autotest is gating a Lua applet?