5.4. Correction service (RTK) configuration
The Vision-RTK 2 requires RTCM3 data to provide real-time corrections for accurate lo-
calization. The user can configure the correction service in the "Configuration → GNSS"
panel of the web interface. The correction service configuration must fulfill the following
specifications:
• Coverage: The area of operation of the sensor must match the geographic opera-
tion area of the correction service provider.
• Transport: Networked Transport of RTCM via Internet Protocol (NTRIP), version 1
only. This method implies that the sensor must have access to the Internet and the
chosen service/server.
• Data format: The supported RCTM3 messages are listed in Subsection 7.2.1.
• Data content: OSR-style multi-signal messages (MSM).
• GNSS constellations: The data must include all four major GNSS constellations
(i.e., GPS, GLONASS, Galileo, and BeiDou). Missing systems will degrade perfor-
mance significantly.
The user must select the desired method to input the correction service data in the
"Source" parameter of the "Correction data" field inside the "Configuration → GNSS"
panel of the web interface (see Figure 5.14 for reference). The following methods are
available:
• Built-in NTRIP client: Connects to the selected NTRIP caster through the Internet.
The sensor automatically sends its location to the caster either from (a) the auto-
matic position estimate from GNSS or (b) a manually configured reference position.
The user must fill in all NTRIP fields to establish a connection (e.g., user, password,
address, and mountpoint). If the NTRIP caster does not use a login, put dummy or
none for the user and password fields. The mountpoint field is mandatory.
• I/O port: The user streams the corresponding RTCM3 messages at appropriate
rates over one of the five TCP ports or one of the two serial ports available on the
Vision-RTK 2. Note that the user can visualize the number of bytes, messages, and
errors received through any port in the "I/O status" field found in the "System →
Info" panel of the web interface. Please refer to Subsection 6.3 for the details.
Vision-RTK 2 | Fixposition Positioning Sensor 26
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