Skip to main content
RACELOGIC Support Centre

IMU – VBOX 3iS Dual Antenna RTK Settings

You can access the menu by pressing the OK button. Use the Up and Down arrows to navigate through the menu and press the OK button to enter a submenu or change a setting. When you edit a setting, the Up and Down buttons will let you scroll through the available options for that setting and the OK button will confirm your selection. Use the Back button to exit a setting. 
This menu can be used to configure the internal/external IMU settings. VB3iSDR Main Menu_IMU Selected.png

IMU Integration

This setting enables IMU integration.

This action will add IMU channels to CAN ID 31B and 31C.

VB3iSDR IMU integratin.png

IMU Location

This setting specifies whether the speed sensor will be using its in-built IMU or an external IMU.

Notes:

  • This option is only presented when the IMU integration is Enabled.
  • When you change the IMU Location, the offset sections will be reset.
VBOX 3iSDR IMU_IMU Location_Internal_Selected (Framed).png

Roof Mount

This setting specifies whether you are using a roof-mounted IMU from Racelogic or not. You should enable this when you have an external IMU installed on the roof mount that the primary antenna is mounted on

When it is Enabled, it will automatically configure an Antenna to IMU offset to account for the 3 cm distance between the IMU and Antenna on the Roof Mount and the Ant to IMU Offset setting will become Ant to Ref. Offset.

Note: This option is only presented when the IMU Location is set to External.

VB3iSDR IMU-roof mount-enabled.png

Wheel Speed Input

 

This setting allows wheel speeds to be passed into the Kalman Filter.

If the unit cannot detect CAN data, you will see a Warning Message on the front panel.

Notes:

  • This option is only presented when the IMU integration is Enabled.
  • If you want to configure the wheel speed further, you can do this in the VBOX Setup software

This action will add the Wheel Speeds channel to CAN ID 31D. 

IMPORTANT
Wheel speeds must not be used when conducting brake stops! 

VBOX 3iSDR IMU_Wheel Speed Input_Enabled_Selected (Framed).png

Ant to Wheel Offset

 

This setting specifies the X, Y, and Z distances between the antenna and the wheel speed reference point. 

The reference point is the centre point between the rear wheels.

You can find more information here.

Note: This option is only presented when Wheel Speed Input is Enabled.

VBOX 3iSDR IMU_Ant to Wheel Offset (Framed).png

Ant to IMU Offset

When Roof Mount is Disabled - Provides the X, Y, and Z offset values from the antenna to the Speed Sensor/IMU that is required for the Kalman Filter algorithm.

When Roof Mount is Enabled - Becomes Ant to Ref. Offset and provides the X, Y, and Z offset values from the roof-mounted IMU to the nominated reference point where all the measurements will be made.

VBOX 3iSDR IMU_Ant to IMU Offset (Framed).png

IMU to Ref. Offset

This is where you can add the X, Y, and Z offset values from the roof-mounted IMU to the nominated reference point where all measurements will be made. 

When Roof Mount is Enabled:

This setting will become available and will automatically add a 1-metre Z-offset, to translate the filtered speed down into the vehicle towards the centre of gravity.

VBOX 3iSDR IMU_IMU to Ref Offset (Framed).png

Orientation - Side facing down

Select the orientation of the VBOX 3iS side facing down. This is only applied once the IMU menu is exited to the Main Menu. When the orientation is changed, the Kalman Filter is reset.

Note:

  • This option is only presented when the IMU Location is set to ‘Internal’.
  • If you use an invalid combination of sides facing down/forward, you will see an error message when you exit the IMU menu. 

VBOX 3iSDR IMU_Side Facing Down_F_Selected (Framed).png

Orientation - Side facing forward

Select the orientation of the VBOX 3iS side facing forward. This is only applied once the IMU menu is exited to the Main Menu. When the orientation is changed, the Kalman Filter is reset.

Notes:

  • This option is only presented when the IMU Location is set to ‘Internal’.
  • If you use an invalid combination of sides facing down/forward, you will see an error message when you exit the IMU menu.

VBOX 3iSDR IMU_Side Facing Forwrd_A_Selected (Framed).png

Pitch/Roll Offset

Auto Level - Begins the process of levelling the IMU calculated Pitch and Roll Angles. Once selected, the unit averages the pitch/roll angles over a 5-second period and will then subtract/add the averaged values to make the pitch/roll angle 0. This offset will be displayed on the main screen.

Clear - Clears the current pitch/roll offset values.

VBOX 3iSDR IMU_Pitch&Roll Offset (Framed).png

Gyro Offset

Auto Level - Begins the process of levelling the IMU calculated Pitch, Roll and Yaw Rates. Once selected, the unit averages the rates over a 5-second period and will then subtract/add the averaged values to make the rates equal to 0. These offsets will be displayed on the main screen.

If the IMU location is set to External and the unit cannot detect an external IMU, it will display an error message.

Clear - Clears the current offset values.

 

VBOX 3iSDR IMU_Gyro Offset (Framed).png

  • Was this article helpful?