ZED-F9P-Integration Manual
UBX-18010802 - R02
3 Getting started Page 15 of 114
Advance Information
3. The NTRIP client receives streaming RTMC data from the NTRIP caster to apply as real-time
corrections to a GNSS rover .
u-center provides a NTRIP client and server application that can be used to easily evaluate a ZED-
F9P base or rover. Typically a u-center NTRIP client connects over the internet to a NTRIP service
provider. The u-center NTRIP client then provides the RTCM 3x corrections to a ZED-F9P rover
connected to the local u-center application. VRS is also supported by the u-center NTRIP client.
The relevant RTCM standard NTRIP version 2 can be downloaded from the RTCM standards
website: NTRIP.
3.5 Configuration of the base and rover for RTK operation
The configuration settings are modified using UBX protocol configuration messages. For more
information, see the Receiver Configuration and CFG Interface sections in the ZED-F9P Interface
Description [2]. If stored in RAM, then the modified settings remain effective until power-down
or reset. If these settings have been stored in BBR (Battery Backed RAM), then the modified
configuration will be used as long as the backup battery supply is not removed or interrupted. The
configuration can be saved permanently in flash memory. The messages that are used to change
or verify the configuration are the UBX-CFG-VALSET, UBX-CFG-VALGET, and UBX-CFG-VALDEL
messages. See the u-blox ZED-F9P Interface Description [2]. u-center 18.05 or later has support
for these messages.
With the new configuration concept a configuration group is identified as CFG-GROUP-*
Within a configuration group there is a configuration item: CFG-GROUP-ITEM.
This configuration item is also known as the "key name" as identified within u-center "Message
view", CFG-VALSET message window.
Within u-center, "Generation 9 Configuration View" - "Advanced Configuration" view. The
configuration group is identified as "Group name", the configuration item is identified as the "item
name".
In this chapter these terms are used in this concept
3.5.1 Time mode configuration on the base
This section relates to the configuration item: CFG-TMODE-MODE for putting the ZED-F9P base
receiver into the correct RTK mode to provide corrections to a ZED-F9P rover.
3.5.1.1 Introduction
Time Mode is a receiver mode where the position of the receiver is known and fixed and only the time
is calculated using all available satellites. This mode allows for using the receiver as a stationary
base station.
There are two possible modes: Fixed mode or survey-in.
3.5.1.2 Fixed position
In order to use the Time Mode, the receiver's position must be known as accurately as possible.
Either the user already knows and enters the position, or it is determined using Survey-in. Errors in
the fixed position will translate into time errors depending on the satellite constellation.
Errors in the base station position will directly translate into rover position errors. The base station
position accuracy should therefore be at least as good as the desired rover absolute position
accuracy.
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