GNSS environment
Select a predefined value from the dropdown list.
If the system is used predominantly in open-sky, then the Open skies setting should be
used. In environments with a lot of GNSS multipath then Some obstructions or Frequent
obstructions can be used depending on the environment. This will allow less accurate
GNSS measurements to update the system and it also places more reliance on the inertial
sensors compared to the GNSS.
Unless the open-skies setting is used, the RT will not report accuracies that meet its
specifications.
Vibration levels
Select a predefined value from the dropdown list.
The Normal vibration level is adequate for most circumstances. The RT is very tolerant
of vibration and has been used successfully in environments with more than 2 g RMS
using the Normal setting. If the velocity innovations are very high, and many GNSS
packets are being dropped, then this setting can be changed.
Typical situations where the High vibration setting should be used include those where
vibration mounts have been used, or where the RT and the antenna are mounted on
different sprung parts of the vehicle (e.g. the cab/chassis of a truck).
Heading lock
The heading of single antenna systems can drift when the RT remains stationary for long
periods of time. To solve this, the RT includes an option to lock the heading to a fixed
value when stationary. This option cannot be used if the vehicle can turn on the spot (i.e.
with no forward velocity). With heading lock enabled the RT can remain stationary for
indefinite periods of time without any problems. For vehicle testing this option is
recommended.
There are four settings to choose from. Disabled should be selected if the vehicle can turn
on the spot. The default setting Normal is best for most applications as it is least likely
to cause problems in the Kalman filter. Tight and Very tight are better when trying to
reduce position drift in poor GNSS environments and traffic jams.
Table 23 gives a more detailed description on each of the heading lock options.
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