Tilt compensation

• Accuracy specifications

• Using Tilt Compensation

• Tilt Compensation workflow

• The Plumb Pole routine

• Tilt Compensation data in the Trimble Business Center software and elsewhere

Tilt Compensation is a measurement mode for pole- and vehicle-mounted GNSS receivers. It uses Inertial Measurement Units (IMUs) in the SPS986 and R780 receivers to automatically correct measured points for receiver/vehicle tilt, which enables more accurate point and line measurements when the receiver is not perfectly vertically plumb over the rod tip.

The requirements for Tilt Compensation are:

• Siteworks software, version 1.10 or later.

• SPS986 or R780 receiver with firmware version 6.01 or later.

• IMU or the Premium Precise Rover option code installed on the SPS986 or R780 receiver.

Tilt Compensation in Siteworks:

• is immune to magnetic disturbances (that is, not dependent on a magnetometer or a compass).

• the maximum tilt is limited only by practical reasons (that is, the visibility of GNSS satellites).

After entering Tilt Compensation mode, you must "align" the receiver to begin obtaining tilt-corrected measurements. To align the receiver, move the receiver so that it experiences accelerations. In survey pole-mounted workflows, simply rock the pole back and forth or walk a short distance and change direction several times. For vehicle-mounted workflows, driving in a circle is the fastest way to align. For best results when using Tilt Compensation, Trimble recommends that you do not use the quick release.