Peter BarkerandClaude Opus 5
805fa9f8d0
guided_above_terrain_posvelaccel_sub.lua integrates its position target
forward by the time since the last callback. When a callback arrived
later than 2/RUN_HZ it substituted 1/RUN_HZ for the real interval:
if (dt > 2.0 / RUN_HZ) then
dt = 1.0 / RUN_HZ
end
so a callback 243ms late advanced the target by 50ms and the remaining
193ms was discarded. The position target then falls behind the clock,
and the vehicle - which tracks that target accurately - covers less
ground than the commanded speed implies.
Measured from a failing Sub.GuidedAboveTerrain run under autotest at
--parallel=16, over the 60 simulated seconds the test watches:
GUIP updates 1047 at 17.2Hz (nominal 20Hz)
late callbacks 76 of 1047 (7.3%), worst 243ms
time discarded 5.82s, so 55.08s integrated of 60.90s elapsed
distance 27.90m of an expected 30.00m, +-1.00m -> failed
The dataflash shows the loss is upstream of the controller, not in it:
the script commanded 0.495m/s and the position controller achieved
0.442m/s against a desired 0.443m/s - it tracked what it was given to
within 0.001m/s, and what it was given was slow.
Cap the step at a fixed MAX_DT instead, so ordinary jitter is
integrated honestly and only a real stall is bounded. Pinning the
simulation speedup was tried first and is not a fix: at
context_set_speedup(10) the run still lost ground, reaching 28.93m,
because it reduces how often callbacks are late without changing what
happens when they are.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
ArduPilot Project
ArduPilot is the most advanced, full-featured, and reliable open source autopilot software available. It has been under development since 2010 by a diverse team of professional engineers, computer scientists, and community contributors. Our autopilot software is capable of controlling almost any vehicle system imaginable, from conventional airplanes, quad planes, multi-rotors, and helicopters to rovers, boats, balance bots, and even submarines. It is continually being expanded to provide support for new emerging vehicle types.
The ArduPilot project is made up of
User Support & Discussion Forums
-
Support Forum: https://discuss.ardupilot.org/
-
Community Site: https://ardupilot.org
Developer Information
-
Github repository: https://github.com/ArduPilot/ardupilot
-
Main developer wiki: https://ardupilot.org/dev/
-
Developer discussion: https://discuss.ardupilot.org
-
Developer chat: https://discord.com/channels/ardupilot
Top Contributors
- Flight code contributors
- Wiki contributors
- Most active support forum users
- Partners who contribute financially
How To Get Involved
-
The ArduPilot project is open source and we encourage participation and code contributions: guidelines for contributors to the ardupilot codebase
-
We have an active group of Beta Testers to help us improve our code: release procedures
-
Desired Enhancements and Bugs can be posted to the issues list.
-
Help other users with log analysis in the support forums
-
Improve the wiki and chat with other wiki editors on Discord #documentation
-
Contact the developers on one of the communication channels
License
The ArduPilot project is licensed under the GNU General Public License, version 3.
Maintainers
ArduPilot is comprised of several parts, vehicles and boards. The list below contains the people that regularly contribute to the project and are responsible for reviewing patches on their specific area.
- Andrew Tridgell:
- Vehicle: Plane, AntennaTracker
- Board: Pixhawk, Pixhawk2, PixRacer
- Francisco Ferreira:
- Bug Master
- Grant Morphett:
- Vehicle: Rover
- Willian Galvani:
- Vehicle: Sub
- Board: Navigator
- Michael du Breuil:
- Subsystem: Batteries
- Subsystem: GPS
- Subsystem: Scripting
- Peter Barker:
- Subsystem: DataFlash, Tools
- Randy Mackay:
- Vehicle: Copter, Rover, AntennaTracker
- Siddharth Purohit:
- Subsystem: CAN, Compass
- Board: Cube*
- Tom Pittenger:
- Vehicle: Plane
- Bill Geyer:
- Vehicle: TradHeli
- Emile Castelnuovo:
- Board: VRBrain
- Georgii Staroselskii:
- Board: NavIO
- Gustavo José de Sousa:
- Subsystem: Build system
- Julien Beraud:
- Board: Bebop & Bebop 2
- Leonard Hall:
- Subsystem: Copter attitude control and navigation
- Matt Lawrence:
- Vehicle: 3DR Solo & Solo based vehicles
- Matthias Badaire:
- Subsystem: FRSky
- Mirko Denecke:
- Board: BBBmini, BeagleBone Blue, PocketPilot
- Paul Riseborough:
- Subsystem: AP_NavEKF2
- Subsystem: AP_NavEKF3
- Víctor Mayoral Vilches:
- Board: PXF, Erle-Brain 2, PXFmini
- Amilcar Lucas:
- Subsystem: Marvelmind
- Samuel Tabor:
- Subsystem: Soaring/Gliding
- Henry Wurzburg:
- Subsystem: OSD
- Site: Wiki
- Peter Hall:
- Vehicle: Tailsitters
- Vehicle: Sailboat
- Subsystem: Scripting
- Andy Piper:
- Subsystem: Crossfire
- Subsystem: ESC
- Subsystem: OSD
- Subsystem: SmartAudio
- Alessandro Apostoli:
- Subsystem: Telemetry
- Subsystem: OSD
- Rishabh Singh:
- Subsystem: Avoidance/Proximity
- David Bussenschutt:
- Subsystem: ESP32,AP_HAL_ESP32
- Charles Villard:
- Subsystem: ESP32,AP_HAL_ESP32