Case K44 Spécifications Page 55

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User InterfaceGPS and Assisted GPS
41Operating Manual 1171.5248.12 ─ 15
Activates/deactivates spreading. When spreading is deactivated the pure navigation data
is modulated onto the RF carrier.
SCPI command:
[:SOURce<hw>]:BB:GPS:SPReading[:STATe] on page 98
Initial HDOP
(R&S SMx/AMU instruments only)
Displays the HDOP (Horizontal Dilution of Precision) of the selected satellite constellation
at the beginning of the simulation.
The displayed HDOP value is not updated. The dynamic "HDOP" calculated on the cur-
rent satellite constellation is displayed in the Real-Time S.P.O.T. dialog.
The HDOP can be used as an indication of 2D positioning quality. The general rule here
is that the smaller the HDOP the better the precision of the position fix will be.
At least four different satellites have to be configured to get a reasonable value; otherwise
-1 will be displayed.
Note: This parameter is enabled only for "Localization" mode.
SCPI command:
[:SOURce<hw>]:BB:GPS:HDOP on page 85
Initial PDOP
(R&S SMx/AMU instruments only)
Displays the PDOP (Position Dilution of Precision) of the selected satellite constellation
at the beginning of the simulation.
The displayed PDOP value is not updated. The dynamic PDOP calculated on the current
satellite constellation is displayed in the Real-Time S.P.O.T. dialog.
The PDOP can be used as an indication of 3D positioning quality. The general rule hire
is, that the smaller the PDOP the better the precision of the position fix will be.
At least four different satellites need to be configured to get a reasonable value; otherwise
-1 will be displayed.
Note: This parameter is enabled only for Localization mode.
SCPI command:
[:SOURce<hw>]:BB:GPS:PDOP on page 92
State
Activates/deactivates the generation of the satellite signal.
SCPI command:
[:SOURce<hw>]:BB:GPS:SATellite<st>:STATe on page 97
Ranging Code
Selects the type of ranging code.
Note: Selecting the ranging code is only enabled for "Generic" simulation mode; for
"Localization" mode this parameter is read-only.
Satellite Configuration
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