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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.
- Show eLevel - to show / hide the electronic bubble level. With the check box selected, the bubble level indicator displays in the GNSS survey and stake dialogs.
- Auto Store After - to activate or deactivate the auto store option. With the check box selected, MAGNET Field automatically measures and then saves a point if the pole tilt value was less than one degree during the time interval longer than the specified Auto Store After value (2 seconds by default). With the check box cleared, points are not stored automatically by the pole tilt value criterion. This feature is disabled for Auto Topo surveys.
- Pole tilt handling selector defines how the tilt correction features will work:
- Compensate radio button - to activate Tilt Correction. When enabled and the pole is tilted from the vertical axis, MAGNET Field will 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 value selected in the Compensate field defines the maximal tilt angle to compensate.
Enabled Compensate mode:
  | Green Bubble The bubble is within the external circle when value in of the tilt pole angle is in the range from zero to the value in the Compensate field. The external circle radius depends on the value, selected in the Compensate field: - if the value in the Compensate field is less than six degrees, the internal circle has the radius equal to value in the Compensate field, and the external circle is fixed to six degrees;
- if the value in the Compensate field is more than six degrees the internal circle radius is fixed to one degree and the external circle is equal to the value in the Compensate field.
|
 | Red Bubble The bubble touches the external circle when the value of the tilt pole angle exceeds the value in the Compensate field. |
- Filter radio button - to activate the use of the maximal tilt angle of the pole. When enabled, after exceeding the specified angle, GNSS epochs will not be used in position calculation in Topo and Stake surveys. Epoch counter will be stopped until the current tilt angle becomes less than the specified value.
Enabled Filter mode:
 | Green Bubble The bubble is within the internal circle when the value of the tilt pole angle is in the range from 0 to the value, selected in the Filter field. |
 | Blue Bubble The bubble is between the internal and external circle when the value of the tilt pole angle is in the range from the value, selected in the Filter field to six degrees. |
 | Red Bubble The bubble touches the external circle when the value of the tilt pole angle is six degrees or more. |
- Disabled radio button - to turn off the tilt correction control:
 | Green Bubble The bubble is always green when shown the GNSS survey and stake dialogs. Right click (tap and hold) the bubble to open the context menu to configure TILT™ Settings. When bubble is not shown in GNSS survey and stake dialogs (the Show eLevel check box is cleared), click and select Setup - TILT™ Settings. |
- Calibrate - to open the Calibrate Level and Compass dialog. Current calibration status is shown near the button.
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 the value of the external magnetic field is in the range from abnormal value to a unacceptable value, the
icon appears and starts blinking. The epoch counter will be paused and the software forbids saving point coordinates for these conditions. Wait will be displayed.
- If the value of the external magnetic field is more than the critical value, the
icon is displayed continuously. The epoch counter will be paused and the software forbids saving point coordinates for these conditions. Wait will be displayed
- To show the text information about magnetic field, click on any data field. The Select Value to Display dialog is opened. Select the Magnetic Field from the list and click
to display it's value during the survey.
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:
- Calibrate the electronic level of the receiver in the Level field. More...
- Calibrate the magnetic compass of the receiver in 3D in the Compass field. More...
- 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:
- The calibration is performed in the field after the receiver has tracked the satellites and determined a position.
- The connection with a controller is established via Bluetooth or Wi-Fi.
- Before calibration it is necessary to turn on and/or attach all equipment which will be used for the survey. For RTK survey, receive the corrections data using the desired modem and obtain the Fixed solution.
- if you use UHF or FH modem, connect the radio antenna; after that, turn on the radio modem;
- if you will use both batteries for the survey, attach the removable battery,
- do not use an external power source.
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:
- 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.
- Click the Calibrate button in the Level: field.
- Wait (up to 30 seconds) until MAGNET Field displays one of the following messages:
- Calibration has completed. In this case, the calibration parameters are saved and the receiver is ready to use
- Calibration has failed. In this case you need to perform the procedure again.
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.
- Hold the receiver flat with the GNSS antenna pointed up.
- Click the Calibrate Compass button.
-
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.
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The calibration process will be completed as soon as the whole sphere is filled. This can be indicated by the following message displayed:
- Calibration has completed. In this case, the calibration parameters are saved and the receiver’s compass is ready to use.
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:
- Calibration has failed. In this case you need to perform the procedure again.
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:
- 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.
- Click the Calibrate button in the Compass Alignment field.
- 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.
- When you turn the receiver necessary number of times, MAGNET Field will display one of the following messages:
- Calibration has completed. In this case, the calibration parameters are saved and the receiver is ready to use .
or
- Calibration has failed. In this case you need to perform the procedure again.
When Compass Recalibration is Required
You will need to calibrate the ELC sensor for the following conditions:
- If the receiver has been off for a long time.
- If the receiver is used for the first time.
- If the survey location changes frequently.
- If the receiver took a shock such as being dropped.
- If the temperature changes on 10 degrees or more.
- If the receiver was transported by a car or airplane.
- If the receiver was near a strong magnetic object or material, such as a permanent magnet, electromagnet, electric transformer, AC power supply, etc.
- After loading new firmware.
- After clearing the NVRAM.
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