Spectracom GSG-5 series, User Manual With Scpi Manual

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Figure 3-26:
Adjusting external attenuation
3.6.1.3 Adjusting Noise Generation
GSG-5/6 has the capability to simulate noise on the GPS L1 band. Noise simulation can be a
powerful tool for receiver testing, since it allows for a strong signal to be submitted, without
jamming the receiver.
To access the Transmit Power view, which—among other things—allows to adjust the noise set
tings, navigate to Options > Transmit Power :
Figure 3-27:
Adjusting noise settings in the Transmit Power view
Noise generation (GSG-5, GSG-56 and GSG-6)
The noise generated by GSG-5, GSG-56 and GSG-6 is similar to the noise of GSG-55, but dif
fers in so that the noise bandwidth is constant and set to cover both the GPS L1 as well as the
GLONASS L1 band. The noise central frequency is not configurable.
Noise-related adjustable parameters
Simulate Noise : Yes/No (Default: Yes)
C/N
O
: Carrier-to-noise density. Range: 0 … 56 dB-Hz
General considerations
International regulations keep the L1 band practically clean from disturbing signals, so the only
noise source is the natural background noise, as expressed in the following equation:
P
N
= kTB
N
3.6 "Options" Menu
CHAPTER
3
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User Manual GSG-5/6 Series Rev. 26
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