Specifications

User InterfaceGPS and Assisted GPS
43Operating Manual 1171.5248.12 ─ 15
Time Shift ms
(R&S SMx/AMU instruments only)
Indicates the time shift of the code sequence in milliseconds.
SCPI command:
[:SOURce<hw>]:BB:GPS:SVID<st>:TSSeconds on page 100
Power
(R&S SMx/AMU instruments only)
Sets the power offset of the satellite in dB. The offset determines the power ratio of the
activated satellites.
After Adjust Total Power to 0dB has been performed, the resulting level of a certain
satellite is calculated according to the following:
Resulting Level = Global Level + Satellite Power + Additional Power
SCPI command:
[:SOURce<hw>]:BB:GPS:SVID<st>:POWer on page 99
Doppler Shift
Enters the Doppler shift of the simulated signal of the satellite.
The simulation of Doppler-shifted GPS signals can be used to check the receiver char-
acteristics under more realistic conditions than with zero Doppler. In contrast to the real
system, however, in "Generic mode" the set Doppler frequency is fixed.
In Localization mode, this parameter is not configurable and is set automatically depend-
ing on the simulated "Geographic Location" and on the satellite's orbit.
Note: The value displayed is the initial Doppler shift at the beginning of the simulation.
This value will be updated internally to implement moving satellites and receivers. How-
ever the value displayed is not updated.
The relevant change to the chip rate of the C/A code is carried out automatically. The
currently valid values for Doppler-shifted carrier frequency and chip rate are displayed
under:
●
Resulting Frequency
●
Resulting C/A chip rate
●
Resulting P chip rate
SCPI command:
[:SOURce<hw>]:BB:GPS:SVID<st>:DSHift on page 98
Duration (Elevation > 2.5/5/7.5/10°)
(R&S SMx/AMU instruments only)
Displays the time the satellite's elevation will be higher than 2.5, 5, 7.5 or 10° at the
beginning of the simulation, as selected with the parameter Satellite Elevation Mask.
The value is displayed in format hh:mm:ss.
This parameter can be used to get an impression of how long the connected GPS receiver
will use this certain satellite for its position fix.
Satellite Configuration