SonTek, a Xylem brand
RiverSurveyor S5/M9 System Manual (February 2013)
7
2.3.1. SonTek RTK GPS - Optional
The RTK GPS option provides precise (±3 cm) real-time kinematic position data to the ADP.
The Bluetooth or Spread Spectrum PCM includes an internal RTK GPS receiver, an external,
high-gain GPS antenna and a mounting mast. It also includes an additional Spread Spectrum
radio modem for communication with the RTK Base Station. The RTK Base Station consists of
an RTK GPS receiver with an external, high-gain GPS antenna, a Spread Spectrum radio mo-
dem for communication with the PCM, an external, high gain antenna and a mounting tripod.
The Base Station receives GPS data at 10-Hz and provides RTK corrections at 1-Hz to the
PCM connected to the ADP. The Base Station should be in a fixed location on shore. A direct
line of sight is best for communication. The maximum communication range is about 2 km.
Figure 6 shows the details for the Base Station.
Table 2 describes the Base Station LED labels.
Figure 6. RTK Base Station Components
Table 2. RTK Base Station LED label descriptions
RTK Quality Connection (Green)
The RTK Base Station receives GPS data via satellite and applies an RTK correction that is
transmitted to the internal GPS of the PCM via Spread Spectrum radio communications. The
RTK correction data is transferred to the ADP’s internal memory for processing. It is then
transmitted along with the ADP data from the PCM to the PC or Mobile device.
Note: If communication between the RTK Base Station and PCM is lost, a sub-meter correction
is typically valid for up to 45 minutes without having to re-establish communications.
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