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PX4-Autopilot/docs/en/msg_docs/TransponderReport.md
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---
pageClass: is-wide-page
---
# TransponderReport (UORB message)
Transponder report.
ADSB report closely matching MAVLink's ADSB_VEHICLE (246) message with few internal extra fields at the end.
Populated by ADSB receivers, processed for user messaging and navigator, logging and republishing ADSB information.
**TOPICS:** transponder_report
## Fields
| Name | Type | Unit [Frame] | Range/Enum | Description |
| ------------------------------------------- | ----------- | ------------ | --------------------------------------- | ------------------------------------------------------------------------------------- |
| <a id="fld_timestamp"></a>timestamp | `uint64` | us | | Time since system start |
| <a id="fld_icao_address"></a>icao_address | `uint32` | | | ICAO address |
| <a id="fld_lat"></a>lat | `float64` | deg | | Latitude, validity flag: PX4_ADSB_FLAGS_VALID_COORDS |
| <a id="fld_lon"></a>lon | `float64` | deg | | Longitude, validity flag: PX4_ADSB_FLAGS_VALID_COORDS |
| <a id="fld_altitude_type"></a>altitude_type | `uint8` | | | Type from ADSB_ALTITUDE_TYPE enum |
| <a id="fld_altitude"></a>altitude | `float32` | m | | Altitude (ASL), validity flag: PX4_ADSB_FLAGS_VALID_ALTITUDE |
| <a id="fld_heading"></a>heading | `float32` | rad | | Course over ground, 0 to 2pi, 0 is north, validity flag: PX4_ADSB_FLAGS_VALID_HEADING |
| <a id="fld_hor_velocity"></a>hor_velocity | `float32` | m/s | | Horizontal velocity, validity flag: PX4_ADSB_FLAGS_VALID_VELOCITY |
| <a id="fld_ver_velocity"></a>ver_velocity | `float32` | m/s | | Vertical velocity, positive is up, validity flag: PX4_ADSB_FLAGS_VALID_VELOCITY |
| <a id="fld_callsign"></a>callsign | `char[9]` | | | The callsign, 8+null, validity flag: PX4_ADSB_FLAGS_VALID_CALLSIGN |
| <a id="fld_emitter_type"></a>emitter_type | `uint8` | | [ADSB_EMITTER_TYPE](#ADSB_EMITTER_TYPE) | Type matching MAVLink's ADSB_EMITTER_TYPE enum |
| <a id="fld_tslc"></a>tslc | `uint8` | s | | Time since last communication |
| <a id="fld_flags"></a>flags | `uint16` | | [PX4_ADSB_FLAGS](#PX4_ADSB_FLAGS) | Flags matching MAVLink's ADSB_FLAGS bitmask |
| <a id="fld_squawk"></a>squawk | `uint16` | | | Squawk code, validity flag: PX4_ADSB_FLAGS_VALID_SQUAWK |
| <a id="fld_uas_id"></a>uas_id | `uint8[18]` | | | Unique UAS ID, not part of ADSB_VEHICLE MAVLink message |
## Enums
### ADSB_EMITTER_TYPE {#ADSB_EMITTER_TYPE}
Used in field(s): [emitter_type](#fld_emitter_type)
| Name | Type | Value | Description |
| ------------------------------------------------------------------------------------- | -------- | ----- | ----------- |
| <a id="#ADSB_EMITTER_TYPE_NO_INFO"></a> ADSB_EMITTER_TYPE_NO_INFO | `uint16` | 0 |
| <a id="#ADSB_EMITTER_TYPE_LIGHT"></a> ADSB_EMITTER_TYPE_LIGHT | `uint16` | 1 |
| <a id="#ADSB_EMITTER_TYPE_SMALL"></a> ADSB_EMITTER_TYPE_SMALL | `uint16` | 2 |
| <a id="#ADSB_EMITTER_TYPE_LARGE"></a> ADSB_EMITTER_TYPE_LARGE | `uint16` | 3 |
| <a id="#ADSB_EMITTER_TYPE_HIGH_VORTEX_LARGE"></a> ADSB_EMITTER_TYPE_HIGH_VORTEX_LARGE | `uint16` | 4 |
| <a id="#ADSB_EMITTER_TYPE_HEAVY"></a> ADSB_EMITTER_TYPE_HEAVY | `uint16` | 5 |
| <a id="#ADSB_EMITTER_TYPE_HIGHLY_MANUV"></a> ADSB_EMITTER_TYPE_HIGHLY_MANUV | `uint16` | 6 |
| <a id="#ADSB_EMITTER_TYPE_ROTOCRAFT"></a> ADSB_EMITTER_TYPE_ROTOCRAFT | `uint16` | 7 |
| <a id="#ADSB_EMITTER_TYPE_UNASSIGNED"></a> ADSB_EMITTER_TYPE_UNASSIGNED | `uint16` | 8 |
| <a id="#ADSB_EMITTER_TYPE_GLIDER"></a> ADSB_EMITTER_TYPE_GLIDER | `uint16` | 9 |
| <a id="#ADSB_EMITTER_TYPE_LIGHTER_AIR"></a> ADSB_EMITTER_TYPE_LIGHTER_AIR | `uint16` | 10 |
| <a id="#ADSB_EMITTER_TYPE_PARACHUTE"></a> ADSB_EMITTER_TYPE_PARACHUTE | `uint16` | 11 |
| <a id="#ADSB_EMITTER_TYPE_ULTRA_LIGHT"></a> ADSB_EMITTER_TYPE_ULTRA_LIGHT | `uint16` | 12 |
| <a id="#ADSB_EMITTER_TYPE_UNASSIGNED2"></a> ADSB_EMITTER_TYPE_UNASSIGNED2 | `uint16` | 13 |
| <a id="#ADSB_EMITTER_TYPE_UAV"></a> ADSB_EMITTER_TYPE_UAV | `uint16` | 14 |
| <a id="#ADSB_EMITTER_TYPE_SPACE"></a> ADSB_EMITTER_TYPE_SPACE | `uint16` | 15 |
| <a id="#ADSB_EMITTER_TYPE_UNASSGINED3"></a> ADSB_EMITTER_TYPE_UNASSGINED3 | `uint16` | 16 |
| <a id="#ADSB_EMITTER_TYPE_EMERGENCY_SURFACE"></a> ADSB_EMITTER_TYPE_EMERGENCY_SURFACE | `uint16` | 17 |
| <a id="#ADSB_EMITTER_TYPE_SERVICE_SURFACE"></a> ADSB_EMITTER_TYPE_SERVICE_SURFACE | `uint16` | 18 |
| <a id="#ADSB_EMITTER_TYPE_POINT_OBSTACLE"></a> ADSB_EMITTER_TYPE_POINT_OBSTACLE | `uint16` | 19 |
| <a id="#ADSB_EMITTER_TYPE_ENUM_END"></a> ADSB_EMITTER_TYPE_ENUM_END | `uint16` | 20 |
### PX4_ADSB_FLAGS {#PX4_ADSB_FLAGS}
Used in field(s): [flags](#fld_flags)
| Name | Type | Value | Description |
| ------------------------------------------------------------------------------------------- | -------- | ----- | ----------- |
| <a id="#PX4_ADSB_FLAGS_VALID_COORDS"></a> PX4_ADSB_FLAGS_VALID_COORDS | `uint16` | 1 |
| <a id="#PX4_ADSB_FLAGS_VALID_ALTITUDE"></a> PX4_ADSB_FLAGS_VALID_ALTITUDE | `uint16` | 2 |
| <a id="#PX4_ADSB_FLAGS_VALID_HEADING"></a> PX4_ADSB_FLAGS_VALID_HEADING | `uint16` | 4 |
| <a id="#PX4_ADSB_FLAGS_VALID_VELOCITY"></a> PX4_ADSB_FLAGS_VALID_VELOCITY | `uint16` | 8 |
| <a id="#PX4_ADSB_FLAGS_VALID_CALLSIGN"></a> PX4_ADSB_FLAGS_VALID_CALLSIGN | `uint16` | 16 |
| <a id="#PX4_ADSB_FLAGS_VALID_SQUAWK"></a> PX4_ADSB_FLAGS_VALID_SQUAWK | `uint16` | 32 |
| <a id="#PX4_ADSB_FLAGS_SIMULATED"></a> PX4_ADSB_FLAGS_SIMULATED | `uint16` | 64 |
| <a id="#PX4_ADSB_FLAGS_VERTICAL_VELOCITY_VALID"></a> PX4_ADSB_FLAGS_VERTICAL_VELOCITY_VALID | `uint16` | 128 |
| <a id="#PX4_ADSB_FLAGS_BARO_VALID"></a> PX4_ADSB_FLAGS_BARO_VALID | `uint16` | 256 |
| <a id="#PX4_ADSB_FLAGS_SOURCE_UAT"></a> PX4_ADSB_FLAGS_SOURCE_UAT | `uint16` | 32768 |
## Constants
| Name | Type | Value | Description |
| ----------------------------------------------- | ------- | ----- | ----------- |
| <a id="#ORB_QUEUE_LENGTH"></a> ORB_QUEUE_LENGTH | `uint8` | 16 |
## Source Message
[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/TransponderReport.msg)
::: details Click here to see original file
```c
# Transponder report
#
# ADSB report closely matching MAVLink's ADSB_VEHICLE (246) message with few internal extra fields at the end.
# Populated by ADSB receivers, processed for user messaging and navigator, logging and republishing ADSB information.
uint64 timestamp # [us] Time since system start
uint32 icao_address # [-] ICAO address
float64 lat # [deg] Latitude, validity flag: PX4_ADSB_FLAGS_VALID_COORDS
float64 lon # [deg] Longitude, validity flag: PX4_ADSB_FLAGS_VALID_COORDS
uint8 altitude_type # Type from ADSB_ALTITUDE_TYPE enum
float32 altitude # [m] Altitude (ASL), validity flag: PX4_ADSB_FLAGS_VALID_ALTITUDE
float32 heading # [rad] Course over ground, 0 to 2pi, 0 is north, validity flag: PX4_ADSB_FLAGS_VALID_HEADING
float32 hor_velocity # [m/s] Horizontal velocity, validity flag: PX4_ADSB_FLAGS_VALID_VELOCITY
float32 ver_velocity # [m/s] Vertical velocity, positive is up, validity flag: PX4_ADSB_FLAGS_VALID_VELOCITY
char[9] callsign # The callsign, 8+null, validity flag: PX4_ADSB_FLAGS_VALID_CALLSIGN
uint8 emitter_type # [@enum ADSB_EMITTER_TYPE] Type matching MAVLink's ADSB_EMITTER_TYPE enum
uint16 ADSB_EMITTER_TYPE_NO_INFO=0
uint16 ADSB_EMITTER_TYPE_LIGHT=1
uint16 ADSB_EMITTER_TYPE_SMALL=2
uint16 ADSB_EMITTER_TYPE_LARGE=3
uint16 ADSB_EMITTER_TYPE_HIGH_VORTEX_LARGE=4
uint16 ADSB_EMITTER_TYPE_HEAVY=5
uint16 ADSB_EMITTER_TYPE_HIGHLY_MANUV=6
uint16 ADSB_EMITTER_TYPE_ROTOCRAFT=7
uint16 ADSB_EMITTER_TYPE_UNASSIGNED=8
uint16 ADSB_EMITTER_TYPE_GLIDER=9
uint16 ADSB_EMITTER_TYPE_LIGHTER_AIR=10
uint16 ADSB_EMITTER_TYPE_PARACHUTE=11
uint16 ADSB_EMITTER_TYPE_ULTRA_LIGHT=12
uint16 ADSB_EMITTER_TYPE_UNASSIGNED2=13
uint16 ADSB_EMITTER_TYPE_UAV=14
uint16 ADSB_EMITTER_TYPE_SPACE=15
uint16 ADSB_EMITTER_TYPE_UNASSGINED3=16
uint16 ADSB_EMITTER_TYPE_EMERGENCY_SURFACE=17
uint16 ADSB_EMITTER_TYPE_SERVICE_SURFACE=18
uint16 ADSB_EMITTER_TYPE_POINT_OBSTACLE=19
uint16 ADSB_EMITTER_TYPE_ENUM_END=20
uint8 tslc # [s] Time since last communication
uint16 flags # [@enum PX4_ADSB_FLAGS] Flags matching MAVLink's ADSB_FLAGS bitmask
uint16 PX4_ADSB_FLAGS_VALID_COORDS = 1
uint16 PX4_ADSB_FLAGS_VALID_ALTITUDE = 2
uint16 PX4_ADSB_FLAGS_VALID_HEADING = 4
uint16 PX4_ADSB_FLAGS_VALID_VELOCITY = 8
uint16 PX4_ADSB_FLAGS_VALID_CALLSIGN = 16
uint16 PX4_ADSB_FLAGS_VALID_SQUAWK = 32
uint16 PX4_ADSB_FLAGS_SIMULATED = 64
uint16 PX4_ADSB_FLAGS_VERTICAL_VELOCITY_VALID = 128
uint16 PX4_ADSB_FLAGS_BARO_VALID = 256
uint16 PX4_ADSB_FLAGS_SOURCE_UAT = 32768
uint16 squawk # [-] Squawk code, validity flag: PX4_ADSB_FLAGS_VALID_SQUAWK
uint8[18] uas_id # [-] Unique UAS ID, not part of ADSB_VEHICLE MAVLink message
uint8 ORB_QUEUE_LENGTH = 16
```
:::
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