Heading IMU vs Heading IMU2

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This page explains the difference between the different Heading channels used by VBOX.

VBOX Heading Channels

Heading

The direction of travel at the antenna/IMU location.

Heading_IMU

The forward direction of the IMU.

It is important to try to align the IMU/VIPS in the forward direction of the vehicle frame as accurately as possible as the channel Heading_IMU is dictated by the forward direction of the IMU.

Heading _IMU2

This value is the Heading_IMU plus an alignment compensation.

The VBOX IMU integration includes a process that will compensate for IMU mounting errors.

When you are using a single antenna unit, the VBOX detects when the vehicle is travelling in a straight line, compares average Heading and Heading_IMU and adds the difference to Heading_IMU to create Heading_IMU2.

When you are using a dual antenna unit, the VBOX uses the dual antenna True Heading to compare the average True Heading and Heading_IMU. It then adds the difference to Heading_IMU to create Heading_IMU2.

In a VIPS system, the VBOX unit detects when the vehicle goes from 0 to 20 km/h in a straight line and compares average Heading and Heading_IMU. It then adds the difference to Heading_IMU to create Heading_IMU2.