Javad TRIUMPH-LS, User Manual

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Introduction
GNSS Interference
The D-SNR screen which tells you at a glance the general
status of satellite signals in the (4) GNSS Bands used in RTK
solutions
Blue shows nominal GNSS signal strength interference less
than -3 db of the expected signal strength. In this example,
the setting was in a fairly open urban area with mostly open
sky above but with buildings, trees and overhead utilities
within the surrounding immediate area.
Green values indicate an area with interference greater
than -3 db up to -6 db.
Red values indicate an area with interference greater than
-6 db and though this interference level is high and will
often be accompanied with the warning LED being lit. Its
still possible that you may be able to obtain positions in
such difficult environments; however, you’ll likely need to
remain in that location for longer periods of time.