Introduction
GMS-2 Operator’s Manual
1-6
GMS-2 Overview
The GMS-2 is a fully integrated hand-held controller and GPS+
receiver. Included in the system is an electronic compass and digital
camera.
The hand-held controller component of the GMS-2
includes the
Windows® CE operating system and color LCD touch screen.
Integrated Bluetooth® wireless technology allows this system to be a
cable-free controller/receiver for maximum portability. The casing is
durable and built for rugged use.
As a field controller, the GMS-2 can run a full suite of field software
for working with total stations and RTK GPS systems.
The GPS+ receiver component of the GMS-2
can receive and
process GPS+GLONASS L1 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, provide under-
canopy and low signal strength reception.
When power is turned on and the receiver self-test completes, the
receiver’s 50 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 satellites at any time and location.
An internal GPS 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 channels. The receiver
processor controls the process of signal tracking.
Once the signal is locked in the channel, it is demodulated and
necessary signal parameters (carrier and code phases) are measured.
Also, broadcast navigation data are retrieved from the navigation
frame.
After the receiver locks on to four or more satellites, it is possible to
solve the so-called “absolute positioning problem” and compute the
receiver’s coordinates (in WGS-84) and the time offset between the
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Summary of Contents for GMS-2
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