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# AirspeedValidated (UORB message)

Validated airspeed.

Provides information about airspeed (indicated, true, calibrated) and the source of the data.
Used by controllers, estimators and for airspeed reporting to operator.

**TOPICS:** airspeed_validated

## Fields

| Name                             | Type      | Unit [Frame] | Range/Enum        | Description                                                                                                                  |
| -------------------------------- | --------- | ------------ | ----------------- | ---------------------------------------------------------------------------------------------------------------------------- |
| timestamp                        | `uint64`  | us           |                   | Time since system start                                                                                                      |
| indicated_airspeed_m_s           | `float32` | m/s          |                   | Indicated airspeed (IAS) (Invalid: NaN)                                                                                      |
| calibrated_airspeed_m_s          | `float32` | m/s          |                   | Calibrated airspeed (CAS) (Invalid: NaN)                                                                                     |
| true_airspeed_m_s                | `float32` | m/s          |                   | True airspeed (TAS) (Invalid: NaN)                                                                                           |
| airspeed_source                  | `int8`    |              | [SOURCE](#SOURCE) | Source of currently published airspeed values                                                                                |
| calibrated_ground_minus_wind_m_s | `float32` | m/s          |                   | CAS calculated from groundspeed - windspeed, where windspeed is estimated based on a zero-sideslip assumption (Invalid: NaN) |
| calibraded_airspeed_synth_m_s    | `float32` | m/s          |                   | Synthetic airspeed (Invalid: NaN)                                                                                            |
| airspeed_derivative_filtered     | `float32` | m/s^2        |                   | Filtered indicated airspeed derivative                                                                                       |
| throttle_filtered                | `float32` |              |                   | Filtered fixed-wing throttle                                                                                                 |
| pitch_filtered                   | `float32` | rad          |                   | Filtered pitch                                                                                                               |

## Enums

### SOURCE {#SOURCE}

| Name                                                            | Type   | Value | Description             |
| --------------------------------------------------------------- | ------ | ----- | ----------------------- |
| <a id="#SOURCE_DISABLED"></a> SOURCE_DISABLED                   | `int8` | -1    | Disabled                |
| <a id="#SOURCE_GROUND_MINUS_WIND"></a> SOURCE_GROUND_MINUS_WIND | `int8` | 0     | Ground speed minus wind |
| <a id="#SOURCE_SENSOR_1"></a> SOURCE_SENSOR_1                   | `int8` | 1     | Sensor 1                |
| <a id="#SOURCE_SENSOR_2"></a> SOURCE_SENSOR_2                   | `int8` | 2     | Sensor 2                |
| <a id="#SOURCE_SENSOR_3"></a> SOURCE_SENSOR_3                   | `int8` | 3     | Sensor 3                |
| <a id="#SOURCE_SYNTHETIC"></a> SOURCE_SYNTHETIC                 | `int8` | 4     | Synthetic airspeed      |

## Constants

| Name                                          | Type     | Value | Description |
| --------------------------------------------- | -------- | ----- | ----------- |
| <a id="#MESSAGE_VERSION"></a> MESSAGE_VERSION | `uint32` | 1     |

## Source Message

[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/versioned/AirspeedValidated.msg)

::: details Click here to see original file

```c
# Validated airspeed
#
# Provides information about airspeed (indicated, true, calibrated) and the source of the data.
# Used by controllers, estimators and for airspeed reporting to operator.

uint32 MESSAGE_VERSION = 1

uint64 timestamp # [us] Time since system start

float32 indicated_airspeed_m_s # [m/s] [@invalid NaN] Indicated airspeed (IAS)
float32 calibrated_airspeed_m_s # [m/s] [@invalid NaN] Calibrated airspeed (CAS)
float32 true_airspeed_m_s # [m/s] [@invalid NaN] True airspeed (TAS)

int8 airspeed_source # [@enum SOURCE] Source of currently published airspeed values
int8 SOURCE_DISABLED = -1 # Disabled
int8 SOURCE_GROUND_MINUS_WIND = 0 # Ground speed minus wind
int8 SOURCE_SENSOR_1 = 1 # Sensor 1
int8 SOURCE_SENSOR_2 = 2 # Sensor 2
int8 SOURCE_SENSOR_3 = 3 # Sensor 3
int8 SOURCE_SYNTHETIC = 4 # Synthetic airspeed

float32 calibrated_ground_minus_wind_m_s # [m/s] [@invalid NaN] CAS calculated from groundspeed - windspeed, where windspeed is estimated based on a zero-sideslip assumption
float32 calibraded_airspeed_synth_m_s # [m/s] [@invalid NaN] Synthetic airspeed
float32 airspeed_derivative_filtered # [m/s^2] Filtered indicated airspeed derivative
float32 throttle_filtered # [-] Filtered fixed-wing throttle
float32 pitch_filtered # [rad] Filtered pitch
```

:::