PX4-Autopilot/docs/en/msg_docs/RtcmData.md

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RtcmData (UORB message)

RTCM3 data exchanged with GNSS receivers.

Published under two topic names that share this definition (see TOPICS below):

rtcm_corrections - external fixed-base corrections fed into the vehicle (MAVLink GPS_RTCM_DATA, UAVCAN RTCMStream, GPS drivers in dump mode). Multiple sources are allowed, one uORB instance each; consumers select an instance via their stale-link logic.

rtcm_moving_baseline - moving-base GPS output (RTCM 4072 or equivalent) intended for a rover. Single publisher per vehicle (on-board moving base, or a CANnode forwarding MovingBaselineData); consumers only read instance 0.

TOPICS: rtcm_corrections rtcm_moving_baseline

Fields

Name	Type	Unit [Frame]	Range/Enum	Description
timestamp	uint64	us		Time since system start
device_id	uint32			Unique device ID of the publisher that produced this RTCM
len	uint16			Length of data
flags	uint8			LSB: 1=fragmented
data	uint8[300]			Correction payload (fixed-base RTCM3 and/or SPARTN frames, or moving-baseline RTCM3)

Constants

Name	Type	Value	Description
ORB_QUEUE_LENGTH	uint8	16
MAX_INSTANCES	uint8	4

Source Message

Source file (GitHub)

::: details Click here to see original file

# RTCM3 data exchanged with GNSS receivers.
#
# Published under two topic names that share this definition (see TOPICS below):
#
# rtcm_corrections - external fixed-base corrections fed into the vehicle (MAVLink
# GPS_RTCM_DATA, UAVCAN RTCMStream, GPS drivers in dump mode). Multiple
# sources are allowed, one uORB instance each; consumers select an instance
# via their stale-link logic.
#
# rtcm_moving_baseline - moving-base GPS output (RTCM 4072 or equivalent) intended for a rover.
# Single publisher per vehicle (on-board moving base, or a CANnode
# forwarding MovingBaselineData); consumers only read instance 0.

uint64 timestamp # [us] Time since system start

uint32 device_id # [-] Unique device ID of the publisher that produced this RTCM

uint16 len # [-] Length of data
uint8 flags # [-] LSB: 1=fragmented
uint8[300] data # Correction payload (fixed-base RTCM3 and/or SPARTN frames, or moving-baseline RTCM3)

uint8 ORB_QUEUE_LENGTH = 16

# Sized for the fixed-base corrections case (up to four independent sources). The moving-baseline
# topic only uses instance 0 (single publisher per vehicle).
uint8 MAX_INSTANCES = 4

# TOPICS rtcm_corrections rtcm_moving_baseline

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