# 保持模式 (Fixed-wing)

The Hold flight mode causes the vehicle to loiter (circle) around its current GPS position and maintain its current altitude.

提示

Hold mode can be used to pause a mission or to help you regain control of a vehicle in an emergency. It is usually activated with a pre-programmed switch.

注解

  • Mode is automatic - no user intervention is required to control the vehicle.
  • Mode requires a global 3d position estimate (from GPS or inferred from a local position).
    • Flying vehicles can't switch to this mode without global position.
    • Flying vehicles will failsafe if they lose the position estimate.
    • Disarmed vehicles can switch to mode without valid position estimate but can't arm.
  • Mode requires wind and flight time are within allowed limits (specified via parameters).
  • RC control switches can be used to change flight modes on any vehicle.
  • RC stick movement is ignored.

# Technical Summary

The aircraft circles around the GPS hold position at the current altitude. The vehicle will first ascend to NAV_MIN_LTR_ALT if the mode is engaged below this altitude.

RC stick movement is ignored.

# Parameters

Hold mode behaviour can be configured using the parameters below.

Parameter Description
NAV_LOITER_RAD The radius of the loiter circle.
NAV_MIN_LTR_ALT Minimum height for loiter mode (vehicle will ascend to this altitude if mode is engaged at a lower altitude).

# See Also

Hold Mode (MC)