# Configure Reference Station

* Under the project window on the left side, left click on the [GNSS reference station](https://docs.phoenixlidar.com/lidarmill-desktop/post-processing/workflow-kk/uploading-files/gnss-reference-station#gnss-reference-station-chc-dat-t-02) file name, and then click on the wrench icon at the bottom left

![](/files/-M_7j3HHE98uTVEJcu12)

* Specify GNSS reference station antenna model next to "Antenna-Type" 

![](/files/-M_7kYieZTGuV6DHOup6)

* Click on "Compute position" to generate a refined reference station position using various methods:
  * NOAA's NGS OPUS
  * Trimble RTX
  * PPP solution
  * Averaged Position
* Note: The refined coordinates are computed at the Antenna Phase Center, and not the ground.
* **Skip the "Compute Position" step if the base reference station was setup over a known ground mark**

![](/files/-M_7jxUS6VkX1RdMVMj3)

* Select from an existing LiDARMill project, or create a new project by inputting a name and description.
* Click "Finish" to begin computing refined positions

![](/files/-M_7mI9Vef8DFI8OL9Wi)

* The uploading and processing status is displayed next to "LiDARMIll Status:"

![](/files/-M_7mfPyp1nyLuQc5vPK)

* Once "LiDARMill Status:" is "Ready", you can select a refined position using the "Position Type" dropdown. 

![](/files/-M_7oiMD80aNy0kBG1tR)

* If the base was setup over a known ground mark:
  * Select "Position Type" as "Custom"
  * Select GNSS reference station antenna model with "Antenna-Type" dropdown
  * Select Coordinate System of reference station coordinates by clicking "..."
  * Input known XY coordinates (Latitude and Longitude, or Easting and Northing)
  * Click "Set height..." to input antenna height and height of ground marker
  * Input Datum Epoch

![Click "Set height..." to configure reference station antenna height](/files/-M_7qYF3Y1wMESqDVK1n)

![](/files/-M_7r26SAvQrJOA9qZpa)

* Click "OK" to finalize Reference Station Configuration


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