Satellite's Constellation - R&S SMW-K44 User Manual

Satellite Navigation

8 Satellite's Constellation

Multi-satellite GNSS signal
The default multi-satellite single GNSS system constellation is the realistic constella-
tion in a theoretical unobscured environment of a static receiver at a specific location. It
includes all visible GNSS satellites, where a line-of-sign (LOS) situation is assumed. In
the GPS system, for instance, the constellation comprises of 11 visible GPS satellites
and it can include maximum of 24 satellites.
Multi-GNSS system signal
The default single GNSS system configuration can be extended to support receiver
tests with complex test signal. You can generate mixed signal comprising satellites of
different GNSS systems or signals spread with different codes, possibly also modula-
ted on the other frequency.
See
Satellites selection criteria
If your test case requires a mixed GNSS signal with predefined minimum and maxi-
mum number of satellites per GNSS system, you can set these limits per GNSS sys-
tem, too.
Moreover, you can adjust the SV handover criteria and thus define when the satellite's
constellation is updated and satellites are exchanged. Satellites exchange is optimized
to fulfill the selected criteria; considered are all available satellites, regardless of the
GNSS system but obeying the limits for maximum and minimum number of satellites.
Visible satellites can be deactivated or reactivated on-the-fly. Current constellation and
an overview of the number of active satellites per GNSS system are displayed.
See
Dynamic monitor
You can observe the real-word situation of disappearance and reappearance of satel-
lites in real time on the build-in simulation monitor. The monitor is also a dynamic dis-
play of several parameters like HDOP and the PDOP.
See
User Manual 1178.6379.02 ─ 01
Chapter 8.1, "Systems and Signals
Chapter 8.2, "Satellites
Chapter 5.3, "Simulation
Settings", on page 52.
Settings", on page 54.
Monitor", on page 26.
Satellite's Constellation
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