7.7 Sensor Ranges
GNSS Compass supports dynamic ranging on its sensors. Each of the three sensors have three different range
settings. At lower ranges the sensor performance is better, but at higher ranges GNSS Compass can be used in
more extreme dynamics. The best performance is achieved by choosing the lowest range that your application
won't generate over-range events.
Sensor over-range events can be detected in the Filter Status field. In the web UI and GNSS Compass
Manager the status indicator will go orange to indicate that a sensor has gone over-range. When a sensor goes
over-range this causes the filter to become inaccurate, and in some cases it can cause the filter to reset.
By default GNSS Compass comes configured to the lowest (most sensitive) sensor ranges. In this configuration
it is possible to send the gyroscopes over-range by quickly rotating the unit in your hand. It is recommended to
monitor the web UI or GNSS Compass Manager when you do this.
The sensor range can be set using the 8.1.3.1 Sensor Ranges page in the web UI or using the 8.2 Using
GNSS Compass Manager.
7.8 Vehicle Profiles
GNSS Compass supports a number of different pre-configured vehicle profiles. These vehicle profiles impose
constraints upon the filter to increase performance. If your application matches one of the available vehicle
profiles, it is required that you select it for use in the Filter Options page in the Web UI or GNSS Compass
Manager. For a list of the different vehicle profiles, see 10.5.5.1 Vehicle Types. If the wrong vehicle profile is
selected, it can cause a significant decrease in performance.
7.9 RTK
The GNSS Compass internal GNSS receiver supports RTK GNSS which uses correction data (RTCM
messages) from a nearby base station to provide accuracy of up to 0.1 m in real time. An RTK system requires
additional infrastructure equipment to generate and receive corrections data, and is not practical for all
applications. Customers who require this level of accuracy but do not need it in real time should consider using
Kinematica.
There are two different methods for receiving RTK corrections:
l
Network
l
Radio modem
For applications where GNSS Compass can achieve internet access, network RTK corrections (NTRIP) are
recommended.
For applications that are unable to access the internet, radio modems can be used to communicate between
GNSS Compass and the base station, see 7.9.2 Radio Modem RTK Corrections.
Note: If you do not need high accuracy positioning in real time, for example if you are planning to use
Kinematica to post-process log files, an RTK system may not be necessary at all.
7.9.1 Network RTK Corrections (NTRIP)
NTRIP can be configured in three ways:
1. Using the GNSS Compass Web UI 8.1.3.8 NTRIP Client in the Configuration Menu.
2. Using the GNSS Compass Manager application, select 8.2.8.2 NTRIP Client under the Tools menu.
v2.0 Page 34 04 Nov 2021
GNSS Compass Reference Manual • Using GNSS Compass
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