px4-firmware/msg/transponder_report.msg

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uint64 timestamp # time since system start (microseconds)
uint32 icao_address # ICAO address
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float64 lat # Latitude, expressed as degrees
float64 lon # Longitude, expressed as degrees
uint8 altitude_type # Type from ADSB_ALTITUDE_TYPE enum
float32 altitude # Altitude(ASL) in meters
float32 heading # Course over ground in radians, -pi to +pi, 0 is north
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float32 hor_velocity # The horizontal velocity in m/s
float32 ver_velocity # The vertical velocity in m/s, positive is up
char[9] callsign # The callsign, 8+null
uint8 emitter_type # Type from ADSB_EMITTER_TYPE enum
uint8 tslc # Time since last communication in seconds
uint16 flags # Flags to indicate various statuses including valid data fields
uint16 squawk # Squawk code
# ADSB flags
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_RETRANSLATE = 256
uint32 ORB_QUEUE_LENGTH = 10