PX4 User Guide
  • Introduction
  • Getting Started
    • Basic Concepts
    • Vehicles/Frames
    • Flight Controllers
    • Sensors
    • Radio Systems
    • Flight Modes
    • Vehicle Status Notifications
      • LED Meanings
      • Tune/Sound Meanings
      • Preflight Checks
    • Payloads & Cameras
    • Flight Reporting
  • Basic Assembly
    • Mounting the Flight Controller
    • Mounting the GPS/Compass
    • Vibration Isolation
    • Cable Wiring
    • CUAV Pixhawk V6X Wiring QuickStart
    • CUAV V5+ Wiring Quickstart
    • CUAV V5 nano Wiring Quickstart
    • Holybro Pixhawk 6C Wiring Quickstart
    • Holybro Pixhawk 6X Wiring Quickstart
    • Holybro Pixhawk 5X Wiring Quickstart
    • Holybro Pixhawk 4 Wiring Quickstart - Discontinued
    • Holybro Pixhawk 4 Mini Wiring Quickstart - Discontinued
    • Holybro Durandal Wiring Quickstart
    • Holybro Pix32 v5 Wiring Quickstart
    • Cube Wiring Quickstart
    • Pixracer Wiring Quickstart
    • mRo (3DR) Pixhawk Wiring Quickstart
  • Standard Configuration
    • Firmware
    • Airframe
    • Sensor Orientation
    • Compass
    • Gyroscope
    • Accelerometer
    • Airspeed
    • Level Horizon Calibration
    • Radio Setup
    • Joystick Setup
    • Flight Modes
    • Battery
    • Safety
      • Failsafe Simulation
    • ESC Calibration
    • Actuators
    • Autotune
  • Vehicle Types & Setup
    • Multicopters
      • Multicopter Config/Tuning
        • MC Filter/Control Latency Tuning
        • MC PID Tuning (Manual/Basic)
        • MC PID Tuning Guide (Manual/Advanced)
        • MC Setpoint Tuning (Trajectory Generator)
          • MC Jerk-limited Type Trajectory
        • Multicopter Racer Setup
      • X500 v2 (Pixhawk 6C)
      • X500 v2 (Pixhawk 5X)
      • X500 (Pixhawk 4)
      • S500 V2 (Pixhawk 4)
      • DJI F450 (CUAV v5+)
      • DJI F450 (CUAV v5 nano)
      • QAV250 (Pixhawk4 Mini) - Discontinued
      • DJI F450 + RTK (Pixhawk 3 Pro)
      • QAV250 (Pixhawk Mini)
      • QAV-R 5" Racer (Pixracer)
      • Omnicopter
    • Planes
      • Fixed Wing Config/Tuning
        • Fixedwing PID Tuning Guide
        • Fixedwing Advanced Tuning Guide
        • Fixedwing Trimming Guide
      • Reptile Dragon 2 (ARK6X)
      • Turbo Timber Evolution (Pixhawk 4 Mini)
      • Wing Wing Z84 (Pixracer)
    • VTOL
      • VTOL Config/Tuning
        • QuadPlane Configuration
        • Back-transition Tuning
        • VTOL w/o Airspeed Sensor
        • VTOL Weather Vane
      • Standard VTOL
        • FunCub QuadPlane (Pixhawk)
        • Ranger QuadPlane (Pixhawk)
        • Falcon Vertigo QuadPlane (Dropix)
      • Tailsitter VTOL
        • Build: TBS Caipiroshka Tailsitter Build (Pixracer)
      • Tiltrotor VTOL
        • Build: Convergence Tiltrotor (Pixfalcon)
    • Airships (experimental)
    • Autogyros (experimental)
      • ThunderFly Auto-G2 (Holybro pix32)
    • Balloons (experimental)
    • Helicopter (experimental)
      • Helicopter Config/Tuning
    • Rovers (experimental)
      • Traxxas Stampede
    • Submarines (experimental)
      • BlueROV2
    • Airframes Reference
  • Flying
    • First Flight Guidelines
    • Flying 101
    • Missions
      • Package Delivery Mission
    • GeoFence
    • Safety Point Planning
    • Flight Modes
      • Position Mode (MC)
      • Altitude Mode (MC)
      • Manual/Stabilized Mode (MC)
      • Acro Mode (MC)
      • Orbit Mode (MC)
      • Position Mode (FW)
      • Altitude Mode (FW)
      • Stabilized Mode (FW)
      • Acro Mode (FW)
      • Manual Mode (FW)
      • Takeoff Mode
      • Land Mode
      • Return Mode
      • Hold Mode
      • Mission Mode
      • Follow Me Mode
      • Offboard Mode
    • Terrain Following/Holding
  • Flight Log Analysis
    • Log Analysis using Flight Review
    • Log Analysis using PlotJuggler
  • Advanced Configuration
    • Finding/Updating Parameters
    • Full Parameter Reference
    • ECL/EKF Overview & Tuning
    • Flight Termination Configuration
    • Bootloader Flashing onto Betaflight Systems
    • Land Detector Configuration
    • Prearm/Arm/Disarm Configuration
    • IMU Factory Calibration
    • Sensor Thermal Compensation
    • Compass Power Compensation
    • Advanced Controller Orientation
    • Static Pressure Buildup
    • Serial Port Configuration
    • MAVLink Telemetry (OSD/GCS)
    • PX4 Ethernet Setup
    • Bootloader Update
  • Hardware (Drones&Parts)
    • Complete Vehicles
      • ModalAI Starling
      • PX4 Vision Kit
      • MindRacer BNF & RTF
        • MindRacer 210
        • NanoMind 110
      • Holybro Kopis 2
      • Bitcraze Crazyflie 2.1
    • Flight Controllers (Autopilots)
      • Pixhawk Series
        • Silicon Errata
      • Pixhawk Standard Autopilots
        • CUAV Pixhawk V6X (FMUv6X)
        • Holybro Pixhawk 6X (FMUv6X)
        • Holybro Pixhawk 6C (FMUv6C)
        • Holybro Pixhawk 6C Mini(FMUv6C)
        • Holybro Pix32 v6 (FMUv6C)
        • Holybro Pixhawk 5X (FMUv5X)
        • Holybro Pixhawk 4 (FMUv5) - Discontinued
        • Holybro Pixhawk 4 Mini (FMUv5) - Discontinued
        • Drotek Pixhawk 3 Pro (FMUv4pro)
        • mRo Pixracer (FMUv4)
        • Hex Cube Black (FMUv3)
        • mRo Pixhawk (FMUv3)
        • Holybro Pixhawk Mini (FMUv3) - Discontinued
      • Manufacturer-Supported Autopilots
        • AirMind MindPX
        • AirMind MindRacer
        • ARK Electronics ARKV6X
        • CUAV X7
        • CUAV Nora
        • CUAV V5+ (FMUv5)
        • CUAV V5 nano (FMUv5)
        • CUAV Pixhack v3 (FMUv3)
        • CubePilot Cube Orange+ (CubePilot)
        • CubePilot Cube Orange (CubePilot)
        • CubePilot Cube Yellow (CubePilot)
        • Holybro Kakute H7v2
        • Holybro Kakute H7mini
        • Holybro Kakute H7
        • Holybro Durandal
        • Holybro Pix32 v5
        • ModalAI Flight Core v1
        • ModalAI VOXL Flight
        • ModalAI VOXL 2
        • mRobotics-X2.1 (FMUv2)
        • mRo Control Zero F7)
        • NXP RDDRONE-FMUK66 FMU
        • Sky-Drones AIRLink
        • SPRacing SPRacingH7EXTREME
        • ThePeach FCC-K1
        • ThePeach FCC-R1
      • Experimental Autopilots
        • BeagleBone Blue
        • Raspberry Pi 2/3 Navio2
        • Raspberry Pi 2/3/4 PilotPi
          • PilotPi with Raspberry Pi OS
          • PilotPi with Ubuntu Server
      • Discontinued Autopilots/Vehicles
        • Drotek Dropix (FMUv2)
        • Omnibus F4 SD
        • BetaFPV Beta75X 2S Brushless Whoop
        • Bitcraze Crazyflie 2.0
        • Aerotenna OcPoC-Zynq Mini
        • CUAV v5
        • Holybro Kakute F7 (Discontinued)
        • Holybro Pixfalcon
        • Holybro pix32 (FMUv2)
        • mRo AUAV-X2
        • 3DR Pixhawk 1
        • Snapdragon Flight
        • Intel® Aero RTF Drone (Discontinued)
      • Pixhawk Autopilot Bus (PAB) & Carriers
        • ARK Electronics Pixhawk Autopilot Bus Carrier
    • Flight Controller Peripherals
      • ADSB/FLARM (Traffic Avoidance)
      • Air Traffic Avoidance: ADSB/FLARM
      • Air Traffic Avoidance: UTM
      • Airspeed Sensors
        • TFSlot Airspeed Sensor
      • Barometers
      • Camera
      • Distance Sensors (Rangefinders)
        • Lightware SFxx Lidar
        • Ainstein US-D1 Standard Radar Altimeter
        • LeddarOne Lidar
        • Benewake TFmini Lidar
        • Lidar-Lite
        • TeraRanger
        • Lanbao PSK-CM8JL65-CC5
        • Avionics Anonymous Laser Altimeter UAVCAN Interface
      • ESCs & Motors
        • PWM ESCs and Servos
        • DShot ESCs
        • OneShot ESCs and Servos
        • DroneCAN ESCs
          • Zubax Telega
          • PX4 Sapog ESC Firmware
            • Holybro Kotleta
            • Zubax Orel
        • VESC
      • TBS Crossfire (CRSF) Telemetry
      • FrSky Telemetry
      • Gimbal (Mount) Configuration
      • GPS/Compass
        • ARK GPS
        • Holybro DroneCAN M8N GPS
        • LOCOSYS Hawk A1 GNSS
        • Hex Here2
        • Holybro M8N & M9N GPS
        • Sky-Drones SmartAP GPS
      • Grippers
        • Servo Gripper
      • Optical Flow
        • ARK Flow
        • PMW3901
        • PX4FLOW (Deprecated)
      • Precision Landing
      • Parachute
      • Power Modules/PDB
        • CUAV HV pm
        • CUAV CAN PMU
        • Holybro PM02
        • Holybro PM07
        • Holybro PM06 V2
        • Holybro PM02D (digital)
        • Holybro PM03D (digital)
        • Pomegranate Systems Power Module
        • Sky-Drones SmartAP PDB
      • Satellite Coms (Iridium/RockBlock)
      • Telemetry Radios
        • SiK Radio
          • RFD900 (SiK) Telemetry Radio
          • HolyBro (SIK) Telemetry Radio
        • Telemetry Wifi
          • ESP8266 WiFi Module
          • ESP32 WiFi Module
          • 3DR Telemetry Wifi (Discontinued)
        • Microhard Serial Telemetry Radio
          • ARK Electron Microhard Serial Telemetry Radio
          • Holybro Microhard P900 Telemetry Radio
        • CUAV P8 Telemetry Radio
        • HolyBro XBP9X - Discontinued
      • RTK GPS
        • ARK RTK GPS
        • RTK GPS Heading with Dual u-blox F9P
        • CUAV C-RTK
        • CUAV C-RTK2 PPK/RTK GNSS
        • CUAV C-RTK 9Ps
        • Femtones MINI2 Receiver
        • Freefly RTK GPS
        • Holybro H-RTK-F9P
        • Holybro H-RTK-M8P
        • Holybro H-RTK Unicore UM982 GPS
        • Locosys Hawk R1
        • Locosys Hawk R2
        • Septentrio AsteRx-RIB
        • Septentrio mosaic-go
        • Trimble MB-Two
        • CubePilot Here+ (Discontined)
      • Remote ID
      • Smart Batteries
        • Rotoye Batmon Battery Smartification Kit
      • Tachometers (Revolution Counters)
        • ThunderFly TFRPM01 Tachometer Sensor
      • I2C Peripherals
        • I2C bus accelerators
        • TFI2CADT01 I2C address translator
      • CAN Peripherals
      • DroneCAN Peripherals
        • PX4 DroneCAN Firmware
        • ARK CANnode
    • Companion Computers
      • Pixhawk + Companion Setup
        • RasPi Pixhawk Companion
      • Companion Computer Peripherals
      • Holybro Pixhawk RPI CM4 Baseboard
      • Auterion Skynode
      • Computer Vision
        • Obstacle Avoidance
        • Safe Landing
        • Collision Prevention
        • Path Planning Interface
        • Motion Capture (MoCap)
        • Visual Inertial Odometry (VIO)
          • Realsense T265 Tracking Camera (VIO)
      • Video Streaming
  • Development
    • Getting Started
      • Recommended Hardware/Setup
      • Toolchain Installation
        • MacOS Setup
        • Ubuntu Setup
        • Windows Setup
        • Visual Studio Code IDE
        • Other/Generic Tools
      • Building the Code
      • Writing your First Application
      • Application/Module Template
    • Concepts
      • PX4 Architecture
      • PX4 Flight Stack Architecture
        • Controller Diagrams
      • Events Interface
      • Flight Modes
      • Flight Tasks
      • Control Allocation
      • PWM limit state machine
      • System Startup
      • SD Card Layout
    • Simulation
      • jMAVSim Simulation
        • Multi-Vehicle Sim with JMAVSim
      • Gazebo Simulation
        • Vehicles
        • Multi-Vehicle Sim
      • Gazebo Classic Simulation
        • Vehicles
        • Worlds
        • Multi-Vehicle Sim
      • FlightGear Simulation
        • FlightGear Vehicles
        • Multi-Vehicle Sim with FlightGear
      • JSBSim Simulation
      • AirSim Simulation
      • Multi-Vehicle Simulation
      • Simulate Failsafes
      • HITL Simulation
      • Simulation-In-Hardware
    • Hardware
      • Flight Controller Reference Design
      • Manufacturer’s Board Support Guide
      • Flight Controller Porting Guide
        • PX4 Board Configuration (kconfig)
        • NuttX Board Porting Guide
      • Serial Port Mapping
      • Airframes
        • Adding a New Airframe
      • Device Drivers
      • Telemetry Radio
        • SiK Radio
      • Sensor and Actuator I/O
        • DroneCAN
        • I2C Bus
        • UART/Serial Ports
          • Port-Configurable Serial Drivers
      • RTK GPS (Integration)
    • Middleware
      • uORB Messaging
      • uORB Graph
      • uORB Message Reference
        • ActionRequest
        • ActuatorArmed
        • ActuatorControlsStatus
        • ActuatorMotors
        • ActuatorOutputs
        • ActuatorServos
        • ActuatorServosTrim
        • ActuatorTest
        • AdcReport
        • Airspeed
        • AirspeedValidated
        • AirspeedWind
        • AutotuneAttitudeControlStatus
        • BatteryStatus
        • ButtonEvent
        • CameraCapture
        • CameraStatus
        • CameraTrigger
        • CellularStatus
        • CollisionConstraints
        • CollisionReport
        • ControlAllocatorStatus
        • Cpuload
        • DebugArray
        • DebugKeyValue
        • DebugValue
        • DebugVect
        • DifferentialPressure
        • DistanceSensor
        • Ekf2Timestamps
        • EscReport
        • EscStatus
        • EstimatorAidSource1d
        • EstimatorAidSource2d
        • EstimatorAidSource3d
        • EstimatorBias
        • EstimatorBias3d
        • EstimatorEventFlags
        • EstimatorGpsStatus
        • EstimatorInnovations
        • EstimatorSelectorStatus
        • EstimatorSensorBias
        • EstimatorStates
        • EstimatorStatus
        • EstimatorStatusFlags
        • Event
        • FailsafeFlags
        • FailureDetectorStatus
        • FollowTarget
        • FollowTargetEstimator
        • FollowTargetStatus
        • GeneratorStatus
        • GeofenceResult
        • GimbalControls
        • GimbalDeviceAttitudeStatus
        • GimbalDeviceInformation
        • GimbalDeviceSetAttitude
        • GimbalManagerInformation
        • GimbalManagerSetAttitude
        • GimbalManagerSetManualControl
        • GimbalManagerStatus
        • GpioConfig
        • GpioIn
        • GpioOut
        • GpioRequest
        • GpsDump
        • GpsInjectData
        • Gripper
        • HealthReport
        • HeaterStatus
        • HomePosition
        • HoverThrustEstimate
        • InputRc
        • InternalCombustionEngineStatus
        • IridiumsbdStatus
        • IrlockReport
        • LandingGear
        • LandingGearWheel
        • LandingTargetInnovations
        • LandingTargetPose
        • LaunchDetectionStatus
        • LedControl
        • LogMessage
        • LoggerStatus
        • MagWorkerData
        • MagnetometerBiasEstimate
        • ManualControlSetpoint
        • ManualControlSwitches
        • MavlinkLog
        • MavlinkTunnel
        • Mission
        • MissionResult
        • ModeCompleted
        • MountOrientation
        • NavigatorMissionItem
        • NormalizedUnsignedSetpoint
        • NpfgStatus
        • ObstacleDistance
        • OffboardControlMode
        • OnboardComputerStatus
        • OrbTest
        • OrbTestLarge
        • OrbTestMedium
        • OrbitStatus
        • ParameterUpdate
        • Ping
        • PositionControllerLandingStatus
        • PositionControllerStatus
        • PositionSetpoint
        • PositionSetpointTriplet
        • PowerButtonState
        • PowerMonitor
        • PpsCapture
        • PwmInput
        • Px4ioStatus
        • QshellReq
        • QshellRetval
        • RadioStatus
        • RateCtrlStatus
        • RcChannels
        • RcParameterMap
        • Rpm
        • RtlTimeEstimate
        • SatelliteInfo
        • SensorAccel
        • SensorAccelFifo
        • SensorBaro
        • SensorCombined
        • SensorCorrection
        • SensorGnssRelative
        • SensorGps
        • SensorGyro
        • SensorGyroFft
        • SensorGyroFifo
        • SensorHygrometer
        • SensorMag
        • SensorOpticalFlow
        • SensorPreflightMag
        • SensorUwb
        • SensorSelection
        • SensorsStatus
        • SensorsStatusImu
        • SystemPower
        • TakeoffStatus
        • TaskStackInfo
        • TecsStatus
        • TelemetryStatus
        • TiltrotorExtraControls
        • TimesyncStatus
        • TrajectoryBezier
        • TrajectorySetpoint
        • TrajectoryWaypoint
        • TransponderReport
        • TuneControl
        • UavcanParameterRequest
        • UavcanParameterValue
        • UlogStream
        • UlogStreamAck
        • UwbDistance
        • UwbGrid
        • VehicleAcceleration
        • VehicleAirData
        • VehicleAngularAccelerationSetpoint
        • VehicleAngularVelocity
        • VehicleAttitude
        • VehicleAttitudeSetpoint
        • VehicleCommand
        • VehicleCommandAck
        • VehicleConstraints
        • VehicleControlMode
        • VehicleGlobalPosition
        • VehicleImu
        • VehicleImuStatus
        • VehicleLandDetected
        • VehicleLocalPosition
        • VehicleLocalPositionSetpoint
        • VehicleMagnetometer
        • VehicleOdometry
        • VehicleOpticalFlow
        • VehicleOpticalFlowVel
        • VehicleRatesSetpoint
        • VehicleRoi
        • VehicleStatus
        • VehicleThrustSetpoint
        • VehicleTorqueSetpoint
        • VehicleTrajectoryBezier
        • VehicleTrajectoryWaypoint
        • VtolVehicleStatus
        • Wind
        • YawEstimatorStatus
      • MAVLink Messaging
      • uXRCE-DDS (PX4-ROS 2/DDS Bridge)
    • Modules & Commands
      • Autotune
      • Commands
      • Communication
      • Controllers
      • Drivers
        • Airspeed Sensor
        • Baro
        • Distance Sensor
        • IMU
        • INS
        • Magnetometer
        • Optical Flow
        • Rpm Sensor
        • Transponder
      • Estimators
      • Simulations
      • System
      • Template
    • Debugging/Logging
      • FAQ
      • Consoles/Shells
        • MAVLink Shell
        • System Console
      • Debugging with GDB
        • SWD Debug Port
        • JLink Probe
        • Black Magic/DroneCode Probe
        • STLink Probe
        • Hardfault Debugging
      • Debugging with Eclipse
      • Failure Injection
      • Sensor/Topic Debugging
      • Simulation Debugging
      • Sending Debug Values
      • System-wide Replay
      • Profiling
      • Binary Size Profiling
      • Logging
      • Flight Log Analysis
      • ULog File Format
    • Tutorials
      • Long-distance Video Streaming
      • Connecting an RC Receiver on Linux
    • Advanced Topics
      • Parameters & Configs
      • Package Delivery Architecture
      • Computer Vision
        • Motion Capture (VICON, Optitrack, NOKOV)
      • Installing driver for Intel RealSense R200
      • Switching State Estimators
      • Out-of-Tree Modules
      • STM32 Bootloader
      • System Tunes
      • Advanced Linux Installation Cases
      • Windows Cygwin Toolchain Maintenance
      • Unsupported Developer Setup
        • CentOS Linux
        • Arch Linux
        • Windows VM Toolchain
        • Windows Cygwin Toolchain
        • Qt Creator IDE
    • Platform Testing and CI
      • Test Flights
        • Test MC_01 - Manual Modes
        • Test MC_02 - Full Autonomous
        • Test MC_03 - Auto Manual Mix
        • Test MC_04 - Failsafe Testing
        • Test MC_05 - Indoor Flight (Manual Modes)
      • Unit Tests
      • Continuous Integration
      • MAVSDK Integration Testing
      • ROS Integration Testing
      • Docker Containers
      • Maintenance
  • Drone Apps & APIs
    • Offboard Control from Linux
    • ROS
      • ROS 2
        • ROS 2 User Guide
        • ROS 2 Offboard Control Example
        • ROS 2 Multi Vehicle Simulation
      • ROS 1 with MAVROS
        • ROS/MAVROS Installation Guide
        • ROS/MAVROS Offboard Example (C++)
        • ROS/MAVROS Offboard Example (Python)
        • ROS/MAVROS Sending Custom Messages
        • ROS/MAVROS with Gazebo Classic Simulation
        • Gazebo Classic OctoMap Models with ROS 1
        • ROS/MAVROS Installation on RPi
        • External Position Estimation (Vision/Motion based)
    • DroneKit
  • Contribution (&Dev Call)
    • Dev Call
    • Support
    • Source Code Management
      • GIT Examples
    • Documentation
    • Translation
    • Terminology/Notation
    • Licenses
  • Releases
    • 1.14
    • 1.13
    • 1.12
Powered by GitBook
On this page
  • Air Traffic Avoidance: ADS-B/FLARM
  • Supported Hardware
  • Hardware Setup
  • FLARM
  • Software Configuration
  • Implementation
  • Testing/Simulated ADSB Traffic
  • Further Information
  1. Hardware (Drones&Parts)
  2. Flight Controller Peripherals

Air Traffic Avoidance: ADSB/FLARM

PreviousADSB/FLARM (Traffic Avoidance)NextAir Traffic Avoidance: UTM

Last updated 1 year ago

Air Traffic Avoidance: ADS-B/FLARM

PX4 can use or transponders to support simple air traffic avoidance in . If a potential collision is detected, PX4 can warn, immediately , or (depending on the value of ).

Supported Hardware

PX4 traffic avoidance works with ADS-B or FLARM products that supply transponder data using the MAVLink message.

It has been tested with the following devices:

  • (uAvionix)

Hardware Setup

Either device can be connected to any free/unused serial port on the flight controller. Most commonly it they are connected to TELEM2 (if this is not being use for some other purpose).

PingRX

The PingRX MAVLink port uses a JST ZHR-4 mating connector with pinout as shown below.

Pin
Signal
Volt

1 (red)

RX (IN)

+5V tolerant

2 (blk)

TX (OUT)

3 (blk)

Power

+4 to 6V

4 (blk)

GND

GND

FLARM

Pin
Signal
Volt

1 (red)

VCC

+4V to +36V

2 (blk)

TX (OUT)

+3.3V

3 (blk)

RX (IN)

+3.3V

4 (blk)

-

+3.3V

5 (blk)

-

+3.3V

6 (blk)

GND

GND

:::note The TX and RX on the flight controller must be connected to the RX and TX on the FLARM, respectively. :::

Software Configuration

Port Configuration

Then reboot the vehicle.

Configure Traffic Avoidance

Configure the action when there is a potential collision using the parameter below:

Parameter
Description

Enable traffic avoidance mode specify avoidance response. 0: Disable, 1: Warn only, 2: Return mode, 3: Land mode.

Horizonal radius of cylinder around the vehicle that defines its airspace (i.e. the airspace in the ground plane).

Collision time threshold. Avoidance will trigger if the estimated time until collision drops below this value (the estimated time is based on relative speed of traffic and UAV).

Implementation

PX4 listens for valid transponder reports during missions.

PX4 will also forward the transponder data to a GCS if this has been configured for the MAVLink instance (this is recommended). The last 10 Digits of the GUID is displayed as Drone identification.

Testing/Simulated ADSB Traffic

:::note Simulated ADS-B traffic can trigger real failsafe actions. Use with care in real flight! :::

To enable this feature:

  1. Rebuild and run PX4.

The code in run_fake_traffic() is then executed. You should see ADS-B warnings in the Console/MAVLink shell, and QGC should also show an ADS-B traffic popup.

::: details Information about the test methods

run_fake_traffic() method

The run_fake_traffic() method is run when the navigator fake_traffic command is called.

The method calls the fake_traffic() method to generate simulated transponder messages around the current vehicle position. It passes in the current vehicle position, and information about the simulated traffic, such as callsign, distances, directions, altitude differences, velocities, and emitter types.

The (commented out) code in run_fake_traffic() simulates a number of different scenarios, including conflicts and non-conflicts, as well as spamming the traffic buffer.

fake_traffic() method

This takes several parameters, which specify the characteristics of the fake traffic:

  • callsign: Callsign of the fake transponder.

  • distance: Horizontal distance to the fake vehicle from the current vehicle.

  • direction: Direction in NED from this vehicle to the fake in radians.

  • traffic_heading: Travel direction of the traffic in NED in radians.

  • altitude_diff: Altitude difference of the fake traffic. Positive is up.

  • hor_velocity: Horizontal velocity of fake traffic, in m/s.

  • ver_velocity: Vertical velocity of fake traffic, in m/s.

  • emitter_type: Type of fake vehicle, as an enumerated value.

  • icao_address: ICAO address.

  • lat_uav: Lat of this vehicle (used to position fake traffic around vehicle)

  • on_uav: Lon of this vehicle (used to position fake traffic around vehicle)

  • alt_uav: Altitude of the vehicle (as reference - used to position fake traffic around vehicle)

The method creates a simulated transponder message near the vehicle, using following steps:

  • Calculates the latitude and longitude of the traffic based on the UAV's position, distance, and direction.

  • Computes the new altitude by adding the altitude difference to the UAV's altitude.

  • If the board supports a Universally Unique Identifier (UUID), the method retrieves the UUID using board_get_px4_guid and copies it to the uas_id field of the structure. Otherwise, it generates a simulated GUID.

  • Publishes the simulated traffic message using orb_publish.

:::

Further Information

The PingRX comes with connector cable that can be attached directly to the TELEM2 port (DF13-6P) on an . For other ports or boards, you will need to obtain your own cable.

FLARM has an on-board DF-13 6 Pin connector that has an identical pinout to the .

Flarm/PingRX are configured in the same way as any other . The only specific setup is that the port baud rate must be set to 57600 and the a low-bandwidth profile (MAV_X_MODE).

Assuming you have connected the device to the TELEM2 port, as shown:

= TELEM 2

= Normal

= 0 (default sending rate for port).

= Enabled

You will now find a new parameter called , which must be set to 57600.

Vertical height above and below vehicle of the cylinder that defines its airspace (also see ).

If a valid transponder report is received, PX4 first uses the traffic transponder information to estimate whether the traffic heading and height indicates there will be an intersection with the airspace of the UAV. The UAV airspace consists of a surrounding cylinder defined by the radius and height , with the UAV at it's center. The traffic detector then checks if the time until intersection with the UAV airspace is below the threshold based on the relative speed. If the both checks are true, the action is started, and the vehicle will either warn, land, or return.

The code can be found in Navigator::check_traffic ().

You can simulate ADS-B traffic for testing. Note that this requires that you .

Uncomment the code in AdsbConflict::run_fake_traffic()().

Execute the in the (or some other , such as the PX4 simulator terminal).

By default run_fake_traffic() publishes a number of traffic messages (it calls to emit each report). These simulate ADS-B traffic where there may be a conflict, where there won't be a conflict, as well as spamming the traffic buffer.

The relevent methods are defined in .

AdsbConflict::fake_traffic() is called by the to create individual ADS-B transponder reports.

Populates a topic with the simulated traffic data.

mRo Pixhawk
mRo Pixhawk
MAVLink Peripheral
set the parameters
/src/modules/navigator/navigator_main.cpp
Build PX4
AdsbConflict.cpp
AdsbConflict.cpp
TransponderReport
MAVLink Peripherals
Serial Port Configuration
ADS-B
FLARM
missions
land
return
ADSB_VEHICLE
PingRX ADS-B Receiver
FLARM
NAV_TRAFF_AVOID
AdsbConflict::fake_traffic()
run_fake_traffic()
NAV_TRAFF_A_HOR
QGroundControl MAVLink Shell
PX4 Console or MAVLink shell
NAV_TRAFF_A_HOR
NAV_TRAFF_A_VER
NAV_TRAFF_COLL_T
Traffic Avoidance Failsafe
navigator fake_traffic command
MAV_1_CONFIG
MAV_1_MODE
MAV_1_RATE
MAV_1_FORWARD
SER_TEL2_BAUD
NAV_TRAFF_AVOID
NAV_TRAFF_A_HOR
NAV_TRAFF_A_VER
NAV_TRAFF_COLL_T