Next Gen GRADE 3D for Certain Track-Type Tractors Caterpillar

Introduction

The GNSS precision tolerance is a setting for warning limits related to the GNSS signal quality. If the error approximations for the GNSS signal quality exceed the GNSS precision tolerance, the system will warn the operator.

There are three GNSS precision tolerance modes:

• Fine

• Medium

• Coarse

The site incharge sets the limit for each mode to suit the type of work being done, and these modes can be deactivated. The operator must determine if the system performance in low accuracy mode is acceptable for the application. If not, then actions should be taken to correct the issues causing low accuracy mode.

Note: The system can lose GNSS signal due to radio frequency interference in the L1, L2, or GLONASS frequency bands. Radio frequency can be caused by the following, an obstructed view of the sky due to buildings, vegetation, other structures, the number of available satellites above the operating location at a given time, or problems with the base system being used to receive corrections.

If the error approximations for the GNSS signal quality exceed the GNSS precision tolerance value of the system application, there are a number of actions that an operator can take:

• Wait for the GNSS precision tolerance to improve and then continue in the selected GNSS precision tolerance.

• Change the GNSS precision tolerance and then continue working on an area that does not require the "Fine" mode GNSS precision tolerance.

• Change the GNSS precision tolerance and then raise the vertical offset in order to leave the constructed surface high. Return to the area when the GNSS signal quality has improved and allows GNSS precision tolerance operation. This change allows the operator to continue working on the same area of the design and not overcut the final design surface.

Selecting the GNSS Accuracy Mode

The operator should check that the selected GNSS precision tolerance is appropriate for the work to be completed. To check and/or set the GNSS precision tolerance, follow the procedure below:

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Illustration 1	g06284660

1. Access the System Settings menu and select "GNSS Precision Tolerance" from the menu.

2. Use the dropdown menu to select or view the desired tolerance.

   • Fine

   • Medium

   • Course

3. Press "Save" to confirm the settings or press "Cancel" to exit without saving.