A GNSS receiver calculates station marker coordinates with the phase center coordinates, antenna model, and ARP height.
A GNSS receiver does not find the coordinates of a station marker directly. It finds the coordinates of the GNSS antenna phase center.
Topcon Field or other post-processing applications use the coordinates of the phase center and two user-specified parameters to calculate the station marker coordinates:
- Model of the receiver
- Measured height of the antenna reference point (ARP, 4) above the station marker
The antenna model and the received signal frequency position of the GNSS give the antenna phase center. Any Topcon GNSS antenna has accurate vertical offsets from the phase center to the ARP for the L1 and L2 frequencies. After the application identifies the receiver model, it automatically takes the applicable offsets from the built-in database and calculates the ARP coordinates.
- Antenna L2 phase center
- L2 phase center vertical offset
- L1 phase center vertical offset
- Antenna Reference Point (ARP)
- Antenna L1 phase center
The input of the measured height of the ARP above the station marker is necessary for field or post-processing applications to calculate the coordinates of the station marker.
The combination of the correct antenna phase center offsets and a reliable ARP height measurement method is necessary to accurately calculate the station marker coordinates of a given point.
Use a measuring tape and the vertical or slant measurement method to find the height of the ARP above the station marker:
Base station (static) occupation | Use the slant measurement method for a tripod-mounted receiver. |
Rover (kinematic) survey | Use the vertical measurement method for a pole-mounted receiver. |
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