TILT™ Settings

To configure automatic tilt correction features for TILT™ enabled GNSS receivers.

This dialog is available for the HiPer HR, HiPer VR and Sokkia GRX3 receivers.

Note: GNSS topo points measured with TILT™ enabled have the icon in the Properties column (the Points dialog).



Tilt Correction

If the GNSS receiver contains HIMU, the user can activate tilt correction in the TILT™ Settings dialog. For Topo, Auto Topo and Stake survey, MAGNET Field uses the tilt pole value from HIMU to calculate the offset of the GNSS antenna phase center in the horizontal plane, for each GNSS epoch. These offset values are used for obtaining the true coordinate of the measured ground point. The offset values are calculated if the current tilt angle does not exceed the value in the Compensate field.

When the current tilt angle exceeds the value in the Compensate field, but it is less than 30 degrees, the epoch counter will be paused and the software forbids saving the point coordinates for these angles. The Topo, Auto Topo and Stake dialogs will display the current position.

When the current tilt angle exceeds 30 degrees, tilt correction will be automatically deactivated.

Note: The icon next to the bubble in Topo / Auto Topo / Stake dialogs (Map View) indicates that an epoch received from the rover does not contain magnetic declination angle data and tilt correction is not performed. If you run across such an issue, please check that your receiver has the latest firmware installed.


Magnetic Interference indicator

Changing of the external magnetic field can influence magnetic compass accuracy. MAGNET Field displays the value of the external magnetic field in the graphical and text view in the Topo / Auto Topo / Stake dialogs (when Map View is selected):

If you need to perform a survey in magnetic interference, we recommend you to deactivate tilt Compensate and activate tilt Filter feature.


Calibrate Level and Compass

This dialog is displayed for the HiPer HR, HiPer VR and Sokkia GRX3 receivers. Before starting with IMU, you must perform the IMU calibration procedure. The procedure consists of the following steps:

  1. Calibrate the electronic level of the receiver in the Level field. More...
  2. Calibrate the magnetic compass of the receiver in 3D in the Compass field. More...
  3. Calibrate the magnetic compass of the receiver in the horizontal plane in the Compass Alignment field. More...

Calibration is performed independently and sequentially. After all three calibrations are finished, the receiver IMU is ready to use.

Below are general recommendations on carrying out the calibration of the IMU:

If the calibration data are no longer valid, the icon appears in the Topo / Auto Topo / Stake dialogs (when Map or Normal view is selected). The epoch counter will be paused and the software forbids saving point coordinates. You need to perform the calibration procedures for the electronic level and the magnetic compass in 3D and the horizontal plane.

See also when compass recalibration is required.


Calibrate Level

To take an accurate level and compass reading, you need to perform the electronic level calibration procedure. To calibrate the level using MAGNET Field:

  1. Set a tripod with a universal tribrach and tribrach adapter. Level the tribrach. Set the receiver on a trigger adapter with 100 mm aluminum prism spacer. Eliminate any vibrations during the calibration. The receiver will track the satellites and determining a position.
  2. Click the Calibrate button in the Level: field.
  3. Wait (up to 30 seconds) until MAGNET Field displays one of the following messages:

Calibrate Compass

To take an accurate compass reading, you need to perform the compass calibration procedure for each location before starting the survey. Make sure to calibrate the level before calibrating the compass.

  1. Hold the receiver flat with the GNSS antenna pointed up.
  2. Click the Calibrate Compass button.
  3. Rotate the receiver 360 degrees in any planes and directions so that the position of the receiver antenna's phase center during rotation would fill the entire sphere around the receiver. Progress bar in MAGNET Field will reflect the process of filling the sphere in percent.

  4. The calibration process will be completed as soon as the whole sphere is filled. This can be indicated by the following message displayed:

    If you stop rotating the receiver during the calibration procedure, the calibration will finish with error after 2 minutes of leaving the receiver still (without movement) and the following message will be displayed:

  5. Note: After you performed the calibration, its parameters will be automatically saved into the receiver. It means that the saved calibration will be used even after you turn off the receiver and turn it on again.


Calibrate Compass in the Horizontal Plane

To take accurate compass reading, you need to perform the compass calibration procedure in the horizontal plane for each location before starting the survey. First, perform the calibration of the level and calibration of the compass in 3D, then calibrate compass in 2D. To calibrate the compass using MAGNET Field:

  1. Set a tripod with a universal tribrach and tribrach adapter. Level the tribrach. Set the receiver on a trigger adapter with 100 mm aluminum prism spacer. Maximum accuracy of calibration is possible when the receiver is orthogonal to the horizontal plane. Eliminate any vibrations during the calibration.
  2. Click the Calibrate button in the Compass Alignment field.
  3. Turn the receiver clockwise in the horizontal plane. The indicator will show how many turns are left until the calibration process is finished. If you have not made any turns for 2 minutes, calibration routine automatically stops.
  4. When you turn the receiver necessary number of times, MAGNET Field will display one of the following messages:

When Compass Recalibration is Required

You will need to calibrate the ELC sensor for the following conditions: