Chapter 5
Timing and 1 PPS Analysis Results
GNSS Results
T-BERD/MTS 5800 Timing Expansion Module User Manual
July 2017
22112315, Rev. 004
Page 55
as well. The CNO Sky Plot test is an easy way to determine what the GNSS receiver
will be able to see given the antenna location. The test will take 6-8 hours but the data
it produces will enable planners to determine if GNSS antennas are in a good location
or if they need to be moved to roll out advanced services.
The sky is divided into 15 parts of azimuth degrees (0-15, 15-30, and so on, until 345-
360) and 9 parts of elevation degrees (0-10, 10-20, and so on, until 80-90), and calcu-
late a running average of CNO in each of the 135 segments. The results are updated
every second and represented in two formats: a table and a spectrogram.
The CNO Map Table has 15 azimuth ranges as rows and 9 elevation ranges as columns
(see
CNO Map Table
in the picture below). The same data is also provided as a spec-
trogram (see
CNO Map Spectrogram
below). The color scheme used in the spectro-
gram is represented in the bar under the map. It color-codes the intensity of CNO in
each of the segment.
GNSS Results
GNSS results provide the status, details concerning the instrument’s location, and the
GNSS time.
Figure 11
CNO Map Spectrogram and CNO Map Table
