Setup
This device can be used in three modes:
GNSS Positioning (~30cm accuracy)
GNSS Positioning with RTK (1.4cm accuracy)
GNSS Base Station
When the SETUP switch is set to
Rover
the device will enter
Position
mode. RTK Surveyor will receive L1 and L2
GNSS signals from the four constellations (GPS, GLONASS, Galileo, and BeiDou) and calculate the position
based on these signals. Similar to a standard grade GPS receiver, the RTK Surveyor will output industry standard
NMEA sentences at 4Hz and broadcast them over any paired Bluetooth device at 115200bps. The end user will
need to parse the NMEA sentences using commonly available mobile apps, GIS products, or embedded devices
(there are many open source libraries). Unlike standard grade GPS receivers that have 2500m accuracy, the
accuracy in this mode is approximately 300mm horizontal positional accuracy with a good grade L1/L2 antenna.
When the SETUP switch is set to
Rover
and RTCM correction data is sent into the radio port or over Bluetooth, the
device will automatically enter
Positioning with RTK
mode. In this mode RTK Surveyor will receive L1/L2 signals
from the antenna and correction data from a base station. The receiver will quickly (within a few seconds) obtain
RTK float, then fix. The NMEA sentences will have increased accuracy of 14mm horizontal and 10mm vertical
accuracy. The RTCM correction data can be obtained from a cellular link to online correction sources or over a
radio link to a 2nd RTK Surveyor setup as a base station.
When the SETUP switch is set to
Base
the device will enter
Base Station
mode. This is used when the device is
mounted to a fixed position (like a tripod or roof). The RTK Surveyor will initiate a survey. After 60 to 120 seconds
the survey will complete and the RTK Surveyor will begin transmitting RTCM correction data out the radio port. A
