Principles of Operation
P/N 7010-0926 1-7
This overview simply outlines the basics of satellite positioning. For
more detailed information, visit the TPS website at
The GRS-1 is a fully integrated hand-held controller and
GPS+GLONASS L1 receiver. Integrated into the unit is a 72 channel
dual frequency GPS and Glonass receiver, and electronic compass,
digital camera and optional cellular modem for internet connections.
The hand-held controller component of the GRS-1 includes the
Windows® Mobile operating system and color LCD touch screen.
Integrated Bluetooth® and Wi-Fi wireless LAN technology allows
this system to be easily connected to other Topcon sensors or wireless
networks. The casing is durable and built for rugged use.
As a field controller, the GRS-1 can run a full suite of field software
for working with total stations and RTK GPS systems.
The GPS+ receiver component of the GRS-1 can receive and
process GPS+GLONASS L1 and L2 signals improving the accuracy
of your survey points and positions. The GPS+ features of the
receiver combine to provide a positioning system accurate for any
survey. Several other features, including multipath mitigation and co-
op tracking, provide under-canopy and low signal strength reception.
When power is turned on and the receiver self-test completes, the
receiver’s 72 channels initialize and begin tracking visible satellites.
Each of the receiver’s channels can be used to track any one of the
GPS or GLONASS signals. The number of channels available allows
the receiver to track all visible GPS and Glonass satellites at any time
An internal L1 GPS+Glonass antenna equipped with a low noise
amplifier (LNA) and the receiver’s radio frequency (RF) device are
connected with a coaxial cable. The wide-band signal received is
down-converted, filtered, digitized, and assigned to different