Spectracom GSG-5 series, Руководство пользователя с руководством по SCPI

Страница: 98 / 378

Table 3-2:
Transmit power offsets
Constellation Signal Power offset, dB
GPS
L1 C/A 0.0
L1 P -3.0
L2 P -3.0
L2C 0.0
L5 +1.5
GLONASS
L1 -2.5
L2 -8.5
Galileo
E1 +1.5
E5a +3.5
E5b +3.5
Beidou
B1 -4.5
B2 -4.5
QZSS
L1 C/A 0.0
L1 SAIF -2.5
3.6.1.1 Adjusting Transmit Power
The term Transmit Power refers to the satellite signal power (signal level) transmitted by GSG
during the execution of a scenario. Transmit Power can be controlled individually by signal
type:
As of software version 7.1.1 (January 2018) the Reference Power setting is used to control the
absolute power level of the GPS L1 C/A signal. Then, the default relative power offset can be
adjusted for each individual signal type other than GPS L1 C/A.
Furthermore, for BeiDou only, you can assign different relative power offsets, depending on
the orbit type (MEO/GEO/IGSO).
This power configuration defines by channel which power level will be used by satellites once
they appear in view.
The power configuration can be changed only before starting a simulation. During the sim
ulation, you can see the power configuration in read-only mode (press the
N/S key to open the
Transmit power
menu). Note that the effect of changing the
Reference power
during
the sim
ulation is different than
before
the simulation: During the simulation, the specified Absolute
power
will be set for all active channels.
There are two ways to adjust the power configuration: Via the front panel (see below), or by
using SCPI commands (see "SOURce: Subsystem Commands" on page 226). Once you mod
ified the power configuration, it will be saved with all other settings when the unit is turned off.
To configure signals power:
82
CHAPTER
3
•
User Manual GSG-5/6 Series Rev. 26
3.6 "Options" Menu