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docs/ko/flight_modes/offboard.md
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@@ -62,6 +62,11 @@ bool thrust_and_torque
bool direct_actuator
```
:::warning
The following list shows the `OffboardControlMode` options for copter, fixed-wing, and VTOL.
For rovers see the [rover section](#rover).
:::
The fields are ordered in terms of priority such that `position` takes precedence over `velocity` and later fields, `velocity` takes precedence over `acceleration`, and so on.
The first field that has a non-zero value (from top to bottom) defines what valid estimate is required in order to use offboard mode, and the setpoint message(s) that can be used.
For example, if the `acceleration` field is the first non-zero value, then PX4 requires a valid `velocity estimate`, and the setpoint must be specified using the `TrajectorySetpoint` message.
@@ -90,20 +95,93 @@ Before using offboard mode with ROS 2, please spend a few minutes understanding
- Velocity setpoint (`velocity` different from `NaN` and `position` set to `NaN`). Non-`NaN` values acceleration are used as feedforward terms for the inner loop controllers.
- Acceleration setpoint (`acceleration` different from `NaN` and `position` and `velocity` set to `NaN`)
- All values are interpreted in NED (Nord, East, Down) coordinate system and the units are \[m\], \[m/s\] and \[m/s^2\] for position, velocity and acceleration, respectively.
- All values are interpreted in NED (Nord, East, Down) coordinate system and the units are `[m]`, `[m/s]` and `[m/s^2]` for position, velocity and acceleration, respectively.
- [px4_msgs::msg::VehicleAttitudeSetpoint](https://github.com/PX4/PX4-Autopilot/blob/main/msg/versioned/VehicleAttitudeSetpoint.msg)
- The following input combination is supported:
- quaternion `q_d` + thrust setpoint `thrust_body`.
Non-`NaN` values of `yaw_sp_move_rate` are used as feedforward terms expressed in Earth frame and in \[rad/s\].
Non-`NaN` values of `yaw_sp_move_rate` are used as feedforward terms expressed in Earth frame and in `[rad/s]`.
- The quaternion represents the rotation between the drone body FRD (front, right, down) frame and the NED frame. The thrust is in the drone body FRD frame and expressed in normalized \[-1, 1\] values.
- The quaternion represents the rotation between the drone body FRD (front, right, down) frame and the NED frame.
The thrust is in the drone body FRD frame and expressed in normalized \[-1, 1\] values.
- [px4_msgs::msg::VehicleRatesSetpoint](https://github.com/PX4/PX4-Autopilot/blob/main/msg/versioned/VehicleRatesSetpoint.msg)
- The following input combination is supported:
- `roll`, `pitch`, `yaw` and `thrust_body`.
- All the values are in the drone body FRD frame. The rates are in \[rad/s\] while thrust_body is normalized in \[-1, 1\].
- All the values are in the drone body FRD frame.
The rates are in `[rad/s]` while thrust_body is normalized in `[-1, 1]`.
### 탐사선
Rover modules must set the control mode using `OffboardControlMode` and use the appropriate messages to configure the corresponding setpoints.
The approach is similar to other vehicle types, but the allowed control mode combinations and setpoints are different:
| Category | 사용법 | Setpoints |
| -------------------------------------------------------------------------------------- | ----------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| (Recommended) [Rover Setpoints](#rover-setpoints) | General rover control | [RoverPositionSetpoint](../msg_docs/RoverPositionSetpoint.md), [RoverSpeedSetpoint](../msg_docs/RoverSpeedSetpoint.md), [RoverAttitudeSetpoint](../msg_docs/RoverAttitudeSetpoint.md), [RoverRateSetpoint](../msg_docs/RoverRateSetpoint.md), [RoverThrottleSetpoint](../msg_docs/RoverThrottleSetpoint.md), [RoverSteeringSetpoint](../msg_docs/RoverSteeringSetpoint.md) |
| [Actuator Setpoints](#actuator-setpoints) | Direct actuator control | [ActuatorMotors](../msg_docs/ActuatorMotors.md), [ActuatorServos](../msg_docs/ActuatorServos.md) |
| (Deprecated) [Trajectory Setpoint](#deprecated-trajectory-setpoint) | General vehicle control | [TrajectorySetpoint](../msg_docs/TrajectorySetpoint.md) |
#### Rover Setpoints
The rover modules use a hierarchical structure to propagate setpoints:
![Rover Control Structure](../../assets/middleware/ros2/px4_ros2_interface_lib/rover_control_structure.svg)
The "highest" setpoint that is provided will be used within the PX4 rover modules to generate the setpoints that are below it (overriding them!).
With this hierarchy there are clear rules for providing a valid control input:
- Provide a position setpoint **or**
- One of the setpoints on the "left" (speed **or** throttle) **and** one of the setpoints on the "right" (attitude, rate **or** steering).
All combinations of "left" and "right" setpoints are valid.
The following are all valid setpoint combinations and their respective control flags that must be set through [OffboardControlMode](../msg_docs/OffboardControlMode.md) (set all others to _false_).
Additionally, for some combinations we require certain setpoints to be published with `NAN` values so that the setpoints of interest are not overridden by the rover module (due to the hierarchy above).
&check; are the relevant setpoints we publish, and &cross; are the setpoint that need to be published with `NAN` values.
| Setpoint Combination | Control Flag | [RoverPositionSetpoint](../msg_docs/RoverPositionSetpoint.md) | [RoverSpeedSetpoint](../msg_docs/RoverSpeedSetpoint.md) | [RoverThrottleSetpoint](../msg_docs/RoverThrottleSetpoint.md) | [RoverAttitudeSetpoint](../msg_docs/RoverAttitudeSetpoint.md) | [RoverRateSetpoint](../msg_docs/RoverRateSetpoint.md) | [RoverSteeringSetpoint](../msg_docs/RoverSteeringSetpoint.md) |
| -------------------- | ----------------------------------------------------------- | ------------------------------------------------------------- | ------------------------------------------------------- | ------------------------------------------------------------- | ------------------------------------------------------------- | ----------------------------------------------------- | ------------------------------------------------------------- |
| Position | position | &check; | | | | | |
| Speed + Attitude | velocity | | &check; | | &check; | | |
| Speed + Rate | velocity | | &check; | | &cross; | &check; | |
| Speed + Steering | velocity | | &check; | | &cross; | &cross; | &check; |
| Throttle + Attitude | attitude | | | &check; | &check; | | |
| Throttle + Rate | body_rate | | | &check; | | &check; | |
| Throttle + Steering | thrust_and_torque | | | &check; | | | &check; |
:::info
If you intend to use the rover setpoints, we recommend using the [PX4 ROS 2 Interface Library](../ros2/px4_ros2_interface_lib.md) instead since it simplifies the publishing of these setpoints.
:::
#### Actuator Setpoints
Instead of controlling the vehicle using position, speed, rate and other setpoints, you can directly control the motors and actuators using [ActuatorMotors](../msg_docs/ActuatorMotors.md) and [ActuatorServos](../msg_docs/ActuatorServos.md).
In [OffboardControlMode](../msg_docs/OffboardControlMode.md) set `direct_actuator` to _true_ and all other flags to _false_.
:::info
This bypasses the rover modules including any limits on steering rates or accelerations and the inverse kinematics step.
We recommend using [RoverSteeringSetpoint](../msg_docs/RoverSteeringSetpoint.md) and [RoverThrottleSetpoint](../msg_docs/RoverThrottleSetpoint.md) instead for low level control (see [Rover Setpoints](#rover-setpoints)).
:::
#### (Deprecated) Trajectory Setpoint
:::warning
The [Rover Setpoints](#rover-setpoints) are a replacement for the [TrajectorySetpoint](../msg_docs/TrajectorySetpoint.md) and we highly recommend using those instead as they have a well defined behaviour and offer more flexibility.
:::
The rover modules support the _position_, _velocity_ and _yaw_ fields of the [TrajectorySetpoint](../msg_docs/TrajectorySetpoint.md).
However, only one of the fields is active at a time and is defined by the flags of [OffboardControlMode](../msg_docs/OffboardControlMode.md):
| Control Mode Flag | Active Trajectory Setpoint Field |
| ----------------- | -------------------------------- |
| position | position |
| velocity | velocity |
| attitude | yaw |
:::info
Ackermann rovers do not support the yaw setpoint.
:::
### Generic Vehicle
@@ -116,8 +194,10 @@ The following offboard control modes bypass all internal PX4 control loops and s
- [px4_msgs::msg::ActuatorMotors](https://github.com/PX4/PX4-Autopilot/blob/main/msg/versioned/ActuatorMotors.msg) + [px4_msgs::msg::ActuatorServos](https://github.com/PX4/PX4-Autopilot/blob/main/msg/versioned/ActuatorServos.msg)
- You directly control the motor outputs and/or servo outputs.
- Currently works at lower level than then `control_allocator` module. Do not publish these messages when not in offboard mode.
- All the values normalized in \[-1, 1\]. For outputs that do not support negative values, negative entries map to `NaN`.
- Currently works at lower level than then `control_allocator` module.
Do not publish these messages when not in offboard mode.
- All the values normalized in `[-1, 1]`.
For outputs that do not support negative values, negative entries map to `NaN`.
- `NaN` maps to disarmed.
## MAVLink Messages
@@ -207,41 +287,7 @@ The following MAVLink messages and their particular fields and field values are
### 탐사선
- [SET_POSITION_TARGET_LOCAL_NED](https://mavlink.io/en/messages/common.html#SET_POSITION_TARGET_LOCAL_NED)
- The following input combinations are supported (in `type_mask`): <!-- https://github.com/PX4/PX4-Autopilot/blob/main/src/lib/FlightTasks/tasks/Offboard/FlightTaskOffboard.cpp#L166-L170 -->
- Position setpoint (only `x`, `y`, `z`)
- Specify the _type_ of the setpoint in `type_mask`:
::: info
The _setpoint type_ values below are not part of the MAVLink standard for the `type_mask` field.
::
값들은 다음과 같습니다:
- -12288 : Loiter 설정점 (설정점에 매우 가까워지면 기체는 멈춤).
- Velocity setpoint (only `vx`, `vy`, `vz`)
- PX4 supports the coordinate frames (`coordinate_frame` field): [MAV_FRAME_LOCAL_NED](https://mavlink.io/en/messages/common.html#MAV_FRAME_LOCAL_NED) and [MAV_FRAME_BODY_NED](https://mavlink.io/en/messages/common.html#MAV_FRAME_BODY_NED).
- [SET_POSITION_TARGET_GLOBAL_INT](https://mavlink.io/en/messages/common.html#SET_POSITION_TARGET_GLOBAL_INT)
- The following input combinations are supported (in `type_mask`): <!-- https://github.com/PX4/PX4-Autopilot/blob/main/src/lib/FlightTasks/tasks/Offboard/FlightTaskOffboard.cpp#L166-L170 -->
- Position setpoint (only `lat_int`, `lon_int`, `alt`)
- Specify the _type_ of the setpoint in `type_mask` (not part of the MAVLink standard).
값들은 다음과 같습니다:
- 다음 비트가 설정되지 않으면 정상적인 동작입니다.
- -12288 : Loiter 설정점 (설정점에 매우 가까워지면 기체는 멈춤).
- PX4 supports the coordinate frames (`coordinate_frame` field): [MAV_FRAME_GLOBAL](https://mavlink.io/en/messages/common.html#MAV_FRAME_GLOBAL).
- [SET_ATTITUDE_TARGET](https://mavlink.io/en/messages/common.html#SET_ATTITUDE_TARGET)
- 다음 입력 조합이 지원됩니다.
- Attitude/orientation (`SET_ATTITUDE_TARGET.q`) with thrust setpoint (`SET_ATTITUDE_TARGET.thrust`).
::: info
Only the yaw setting is actually used/extracted.
:::
Rover does not support a MAVLink offboard API (ROS2 is supported).
## 오프보드 매개변수