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IntroductionGPS and Assisted GPS

20Operating Manual 1171.5248.12 ─ 15

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 "Generic Mode".

5. Select an arbitrary data or "Real Navigation Data" as "Data Source".

6. When using Real Navigation Data, use the "Select Almanac File" function and choose

an almanac file.

The navigation message will be extracted from this almanac file.

7. Adjust the "Date" and the simulation time ("GPS Mean Time").

8. Select "Satellite Configurations" and configure the satellites as required.

9. Set the GPS "State" to ON to enable the GPS signal generation.

The generated GPS signal is calculated according to the satellite configuration set-

tings, the selected almanac file and selected moment of time (date and time).

2.8.2 Generating Multipath Scenarios

(for R&S SMx/AMU instruments only)

1. Enable the instrument to work in "Generic Mode", "Localization Mode Auto SV Selec-

tion" or "Full Configuration" mode.

2. Select the "Satellite Configuration".

3. To simulate multipath, assign the same space vehicle ("SV ID") to more than one

configuration columns (simulated satellites) and select different:

a) Additional Time Shift

b) Additional Power

c) Additional Doppler Shift

4. Enable the GPS signal generation.

The instrument will generate the GPS signal of satellite(s) that experiences multipath

propagation.

2.8.3 Generating GPS Signal with Flexible Simulation Time (Localization

Mode Auto SV Selection)

(for R&S SMx/AMU instruments only)

Typical Workflows

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Case K44 Spécifications Page 34