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Remote-Control CommandsGPS and Assisted GPS

92Operating Manual 1171.5248.12 ─ 15

[:SOURce<hw>]:BB:GPS:NAVigation:SIMulation[:BEGin]:TIME <Time>

Enters the exact time for the simulation. The used time zone is Greenwich Mean Time.

The command is only available if data source Real Navigation Data is selected

(SOURce:BB:GPS:NAV:DATA RND).

While calculating the GPS signal offline with R&S WinIQSIM2, there is a limitation for the

values allowed for the second's subfield. Since a GPS subframe is 6 seconds long, to

align the waveform generation to the start of a GPS subframe, only values that are aligned

to 6 are allowed. i.e. 0, 6, 12, etc.

To generate an offline GPS signal with time of simulation different than these values,

select a Marker Delay (BB:GPS:TRIG:OUTP:DEL).

Parameters:

<Time> HH,MM,SS

*RST: 0,0,0

Example:

BB:GPS:NAV:SIM:TIME 12,45,36

sets the time for the simulation.

[:SOURce<hw>]:BB:GPS:NAVigation:SIMulation[:BEGin]:YEAR <Year>

Sets the year of the simulation start. The command is only available if data source Real

Navigation Data is selected (SOURce:BB:GPS:NAV:DATA RND).

Parameters:

<Year> float

Range: -9999 to 9999

*RST: -

Example:

BB:GPS:NAV:SIM:YEAR 10

sets the simulation start year.

[:SOURce<hw>]:BB:GPS:PDOP?

(R&S SMx/AMU instruments only)

Queries the PDOP (Position Dilution of Precision) of the selected satellite constellation

at the beginning of the simulation.

The PDOP can be used as an indication of 3D positioning quality.

The general rule here is, that the smaller the PDOP the better the precision of the position

fix will be.

At least three different satellites need to be configured to get a reasonable value, other-

wise -1 will be set.

Note: This parameter is enabled only for "Localization" Mode.

Return values:

<Pdop> float

Satellites Configuration and Satellites Signal Settings

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Case K44 Spécifications Page 106