Micro-JLT GNSS™ User Manual
24 © 2019 Jackson Labs Technologies, Inc.
In this Automatic mode, the unit will configure the GNSS receiver based on the actual
vehicle-velocity:
Please note that in order to switch from the Automotive mode into the first Airborne (1g) mode, both
a vehicle velocity greater than 60 knots as well as a climb/descent rate greater than 400 feet per
minute are required. Alternatively, a vehicle velocity of greater than 100 Knots will also initiate a
switch into airborne-1g mode.
Without an appropriate climb/descent, the unit will remain in Automotive mode unless 100 knots of
velocity are exceeded.
The following command returns the setting of the GNSS dynamic model:
GPS:DYNAMic:MODE?
The actual state chosen by the firmware for the GNSS receiver based on vehicle velocity can be
obtained with the command:
GPS:DYNAMic:STATe?
A value between 0 and 7 is then returned depending on vehicle dynamics.
The dynamic state is always set to STATIONARY if one of the Position Hold Auto Survey stationary
modes is selected using the command GPS:TMODe, as the Position Hold mode setting overrides any
dynamic state user setting.
Settings will be applied immediately to the GNSS receiver, and are stored in Non Volatile memory.
3.3.21 GPS:DYNAMic:STATe?
This query returns the actual state of the dynamic model, chosen by the firmware to be applied to the
GNSS receiver depending on vehicle velocity. It returns a value between 0 and 7, which correspond
to one of the dynamic models defined in the Table in Section 3.3.20 .
This state can be different from the user-selected Dynamic model mode for two reasons:
• if the dynamic mode is set to 8 (Automatic mode), the state will reflect the dynamic model being
applied to the GNSS receiver depending on actual vehicle dynamics
>60 knots and >400 Feet/min
climb/descent
Airborne 1g <50 knots
>150 knots Airborne 2g <130 knots
>240 knots Airborne 4g <210 knots
Table 3.3 Auto Dynamic Mode Switching Rules
Velocity Threshold Selected Dynamic Model Fallback to lower setting
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