Introduction
GR-3 Operator’s Manual
1-6
data integrity information (for example, satellite health
warnings).
– Current ephemerides and almanacs.
Conclusion
This overview simply outlines the basics of satellite positioning. For
more detailed information, visit the TPS website.
Receiver Overview
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, GLONASS, or GALILEO signals. The number of channels
available allows the receiver to track all visible global positioning
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, its absolute
position in WGS-84 and the time offset between the receiver clock
and GPS time are computed. This information and the measurement
data can be stored in the optional MMC or SD card
1
and downloaded
later onto a computer, then processed using a post-processing
software package. When the receiver operates in RTK mode, raw data
measurements can also be recorded into the receiver’s internal
memory. This allows the operator to double check real-time results
obtained in the field.
1. MMC = multi-media card; SD = secure digital
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