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@@ -185,7 +185,24 @@ Due to the inherent danger of this, this function is disabled using [CBRK_FLIGHT
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## Position (GNSS) Loss Failsafe
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The _Position Loss Failsafe_ is triggered if the quality of the PX4 global position estimate falls below acceptable levels (this might be caused by GPS loss) while in a mode that requires an acceptable position estimate.
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The _Position Loss Failsafe_ is triggered if the quality of the PX4 position estimate falls below acceptable levels (this might be caused by GPS loss) while in a mode that requires an acceptable position estimate.
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The sections below cover first the trigger and then the failsafe action taken by the controller.
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### Position Loss Failsafe Trigger
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There are basically two mechanisms in PX4 to trigger position failsafes:
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- A timeout since the last sensor data was fused that provides direct speed or horizontal position measurements. Sensors that fall into that category are: GNSS, optical flow, airspeed, VIO, auxiliary global position.
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- The estimated horizontal position accuracy exceeds a certain threshold. This check is only done on hovering systems (rotary wing vehicles or VTOLs in hover phase).
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The relevant parameters shown below.
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| Параметр | Опис |
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| -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| <a id="EKF2_NOAID_TOUT"></a>[EKF2_NOAID_TOUT](../advanced_config/parameter_reference.md#EKF2_NOAID_TOUT) | Maximum inertial dead-reckoning time, so the time after the last data sample was received of any sensor that constrains the velocity drift [microseconds]. |
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| <a id="COM_POS_FS_EPH"></a>[COM_POS_FS_EPH](../advanced_config/parameter_reference.md#COM_POS_FS_EPH) | Horizontal position error threshold for hovering vehicles (Multicopters and VTOLs in hover). Fixed-wing vehicles have this value set to infinity. |
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### Position Loss Failsafe Action
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The failure action is controlled by [COM_POSCTL_NAVL](../advanced_config/parameter_reference.md#COM_POSCTL_NAVL), based on whether RC control is assumed to be available (and altitude information):
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