IBVS_NMPC_PX4_WS

The simulation code of my undergraduate thesis:

Perception-constrained Visual Servoing Based NMPC for Quadrotor Flight

Demo

ibvs_nmpc_px4.mp4

Introduction

In this project, I leveraged Image-Based Visual Servo to control the translation and rotation of the four-rotor UAV, where the expected velocity v was calculated according to the image moment error, and the velocity v was tracked by the Nonlinear Model Predictive Control. Meanwhile, I also take the vision restriction into consideration to prevent the loss of visual features.

Requirements

• Python 3

• OpenCV 4+

• ROS Noetic

• Gazebo - ROS Noetic

Package Installation

1.  wget -c https://raw.githubusercontent.com/qboticslabs/ros_install_noetic/master/ros_install_noetic.sh && chmod +x ./ros_install_noetic.sh && ./ros_install_noetic.sh

2.  sudo apt-get install ros-noetic-desktop-full ros-noetic-joy ros-noetic-octomap-ros ros-noetic-mavlink protobuf-compiler libgoogle-glog-dev ros-noetic-control-toolbox python3-wstool python3-catkin-tools

3. Prepare pip-python3:

    sudo curl https://bootstrap.pypa.io/get-pip.py | sudo python3 
    sudo curl https://bootstrap.pypa.io/get-pip.py | python3

4. echo 'export PATH=$PATH:"$HOME/.local/bin"' >> ~/.bashrc
   source ~/.bashrc

5. Install the necessary packages of Python3

   sudo python3 -m pip install -U rosdep catkin_pkg future 
   python3 -m pip install -U rosdep catkin_pkg future empy defusedxml numpy matplotlib imageio opencv-python

Usage

1.  git clone https://gitee.com/Hang_SJTU/ibvs_nmpc_px4_ws.git

2.  catkin build
   

   Declare：Compile the workspace, Then in the devel/lib directory of this workspace directory, you can find the file 'librealsense_gazebo_plugin.so' (or possibly 'librealsense_ros_gazebo.so', and rename it as 'librealsense_gazebo_plugin.so') Copy and paste it under /opt/ros/noetic/lib/

3. source devel/setup.bash
   

4. Spawn the drone and the circle/aruco world:

   roslaunch simulation_iris_circle.launch # for circle world
   
   roslaunch simulation_iris_aruco.launch # for aruco world
   

5. Detect the target:

   roslaunch ibvs_pkg ibvs_circle.launch # for circle world
   
   roslaunch ibvs_pkg ibvs_aruco.launch # for aruco world
   

6. Control the drone:

   roslaunch mpc_pkg mpc_acados_controller.launch # nmpc based on acados 
   
   roslaunch mpc_pkg mpc_acado_controller.launch  # nmpc based on acado(bad result)
   

   Declare：Based on the expected speed and IMU feedback attitude estimated by VIO, the C++ code generated by ACADO or the Python code of ACADOS is used to construct the nmpc model for calculation, and the thrust and 3 direction bodyrates are the output to the underlying controller.

Problem

• SO CONFUSED!!!!! Current MPC bug, the results calculated by the C code generated based on ACADO framework's code generation are inconsistent with the original framework's calculation results (same input), only when the visual features contraints are added into the model.

Afterthat, I use ACADOS instead of ACADO to solve the visual features contraints problem and get ideal results, but the previous problem of ACADO still remains.

Citation

Please use the following bibtex if you find this repo helpful and would like to cite:

@misc{ibvsnmpcpx4,
  author = {Zhang, Yuanhang},
  title = {Perception-constrained Visual Servoing Based NMPC for Quadrotor Flight},
  year = {2023},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/hang0610/ibvs_nmpc_px4}},
}