在~/.bashrc文件中source功能包绝对路径

eg：
source ~/catkin_ws/src/Firmware/Tools/setup_gazebo.bash ~/catkin_ws/src/Firmware/ ~/catkin_ws/src/Firmware/build/posix_sitl_default

export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:~/catkin_ws/src/Firmware

export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:~/catkin_ws/src/Firmware/Tools/sitl_gazebo