The Return flight mode causes the vehicle to ascend to a safe height, then return to its home position where it may then either wait (hover or circle) or land.
该模式需要GPS。 This mode is automatic - no user intervention is required to control the vehicle. RC control switches can be used to change flight modes on any vehicle. The effect of RC stick movement depends on the vehicle type.
A copter/multi-rotor will first ascend to the return altitude (by default, RTL_RETURN_ALT) and then fly to the home position in a straight line and constant altitude (if already above the return altitude it will return at its current altitude).
当它到达起点/起飞位置时，它将迅速下降到 RTL_DESCEND_ALT 高度。 然后它会在着陆前悬停，悬停时间在 RTL_LAND_DELAY </ 0>中定义。</p>
If the vehicles is:
- Above RTL_RETURN_ALT (1) it will return at its current altitude.
- Below the cone it will return where it intersects the cone (2) or RTL_DESCEND_ALT (whichever is higher).
- Outside the cone (3) it will first climb until it reaches RTL_RETURN_ALT.
- Inside the cone:
- If RTL_CONE_ANG is 0 degrees there is no "cone":
- the vehicle returns at
- This is the default behaviour.
- the vehicle returns at
- If RTL_CONE_ANG is 90 degrees the vehicle will return at the greater of
RTL_DESCEND_ALTand the current altitude.
- The vehicle will always ascend at least RTL_DESCEND_ALT for the return.
The RTL behaviour can be configured using the parameters below.
|RTL_RETURN_ALT||Return altitude in meters (default: 60m) when RTL_CONE_ANG is 0. If already above this value the vehicle will return at its current altitude.|
|RTL_DESCEND_ALT||Minimum return altitude and altitude at which the vehicle will slow or stop its initial descent from a higher return altitude (default: 30m)|
|RTL_LAND_DELAY||Time to hover at
|RTL_MIN_DIST||Minimum horizontal distance from home position to trigger ascent to the return altitude specified by the "cone". If the vehicle is horizontally closer than this distance to home, it will return at its current altitude or
|RTL_CONE_ANG||Half-angle of the cone that defines the vehicle RTL return altitude. Values (in degrees): 0, 25, 45, 65, 80, 90. Note that 0 is "no cone" (always return at
|COM_RC_OVERRIDE||If enabled stick movement gives control back to the pilot in Position mode (except when vehicle is handling a critical battery failsafe). Enabled by default.|
A fixed-wing aircraft behaves the same as a multicopter on the return trip (respecting the same parameters). The only difference is that on arrival the vehicle will, by default, circle above the home position rather than hover/land. If RTL_LAND_DELAY is set to -1 the vehicle will land as described in the topic: Landing (Fixed Wing). RC stick movement is ignored.
The following additional parameters affect return mode on fixed wing:
A VTOL follows the return behavior and parameters of Fixed Wing when in FW mode, and of Multicopter when in MC mode. A VTOL in FW mode will always transition back to MC just before landing (ignoring NAV_FORCE_VT).