Specifications

IntroductionGPS and Assisted GPS
22Operating Manual 1171.5248.12 ─ 15
Enable this mode, if a simulation of realistic GPS scenario of up to 4 configurable GPS
satellites per baseband with satellite handover is required. The signal will be calculated
for the selected fixed or moving location. Simulation of moving receiver requires option
Assisted GPS R&S-K65.
1. Execute "Set To Default" to adjust the instrument's settings to a standard set of oper-
ating conditions.
2. Select the required "RF Band".
3. Adjust the output frequency of the instrument to the frequency selected with the
parameter "RF Band":
a) for RF instruments, select "Set to Default RF and Level" or
b) select the FREQ key to set the frequency in the header of the instrument.
4. Set the parameters "Simulation Mode" to "Localization Mode".
5. Set the "Localization Mode" to "Auto SV Selection and Update".
6. Select and configure a static predefined or user-defined "Geographic Location" or a
moving receiver.
7. Use the "Select Almanac File" function and choose an almanac file.
The navigation message will be extracted from this almanac file.
8. Adjust the "Date" and the simulation time ("GPS Mean Time").
9. Choose the generation of GPS signal of 4 or 8 satellites.
10. Adjust the required "Satellite Elevation Mask" and set the elevation mask of the GPS
receiver to this value.
11. Set the GPS "State" to ON to enable the GPS signal generation.
The R&S Signal Generator generates a realistic GPS signal for 4 or 8 satellites' con-
stellation, calculated to fulfill the minimum PDOP and satellite visibility criteria. The
selected satellites are dynamically and on-the-fly exchanged as soon as a handover
is necessary. The satellites parameters displayed in the "Satellite Configurations"
dialog and the "Navigation Message" parameters are read-only.
Open the Real-Time S.P.O.T. display to show the position of the active and inactive
satellites. The current values of the parameters "PDOP", "HDOP", "Receiver Loca-
tion", "Time of Simulation" and "Elapsed Time" are also displayed. If a moving
receiver had been configured, the "Real-Time S.P.O.T." displays the ideal trajectory
the receiver should have.
2.8.5 Generating A-GPS Custom Build Scenarios (Localization Mode Full
Configuration)
(for R&S SMx/AMU instruments equipped with option Assisted GPS (R&S-K65) only)
1. Execute "Set To Default" to adjust the instrument's settings to a standard set of oper-
ating conditions.
Typical Workflows