Evb Installation Angle Confirmation; Yaw Rate Calibration - Quectel LG69T AA User Manual

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4.2.1. EVB Installation Angle Confirmation

Before the 6-axis accelerometer sensor is available, the EVB installation angle needs to be confirmed by

following steps:

Step 1: Install the EVB on a vehicle and connect the antenna.

Step 2: Start the vehicle and power on the EVB.

Step 3: Keep the vehicle stationary for at least 20 s on a flat road (the tolerance of the gravity direction is

1°–2°).

Step 4: Drive the vehicle for 1 minute.

Step 5: Stop the vehicle and keep it still for at least 5 seconds. The module saves the calculated

installation angle to the flash memory through software logic.

The yaw rate calibration steps of LG69T (AA) EVB are as follows:

Once the installation angle is confirmed, the following steps should be performed to fine tune the calibration

accurately:

Step 1: Based on Step 5 above, the yaw rate offset will be automatically initialized with a reliable value.

After it is initialized, drive in a straight road (speed > 30 km/h) for at least 5 minutes.

Step 2: Drive in areas rich in curved roads (speed > 30 km/h). This is required for calibrating the yaw rate

gain. It is important to make tight turns (with narrow curvature radius). Typical scenarios that allow

proper performance of this step involve roundabouts, tight turns, and sharp bends greater than

90 degrees. Broader turns (e.g. smooth turns on highway, lane changes, etc.) will not work.

Please note that the success of this operation does not depend on its duration, but rather on the

number of valid turns. In order to have a fine-tuned yaw rate gain, it is suggested that the first-

boot calibration route should include at least 10 tight turns described above. The same turn can

be repeated many times.

It is most important to perform all these operations under adequate GNSS signal conditions, which means

that the antenna must have maximum sky visibility. Thus, the calibration should be performed under clear

sky conditions, i.e. in the area away from high-rise buildings, forests, tunnels and any other element that

may cause signal blocking or reflection.

LG69T(AA,AD)_EVB_User_Guide

GNSS Module Series

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