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User InterfaceGPS and Assisted GPS

39Operating Manual 1171.5248.12 ─ 15

(enabled for "Localization" mode)

Sets the satellite's elevation, i.e. determines the minimum angular distance of a satellite

above the horizon.

When the elevation decreases below the selected elevation mask, the GPS satellite is

considered as invisible and hence the GPS receiver can not use this satellite for deter-

mining its position. The GPS receiver has to search for another satellite with better visi-

bility. This process is called handover.

Satellites handover is performed in Localization mode set to "Auto SV Selection and

Update" only. The expected time of the next upcoming satellites handover is displayed

in the "Real-Time S.P.O.T." view with the parameter Real-Time S.P.O.T..

While analyzing the generated GPS signal, make sure that the elevation mask of the GPS

receiver is set to the "Satellite Elevation Mask" used by the signal generation.

SCPI command:

[:SOURce<hw>]:BB:GPS:SEMask on page 81

Satellite Configuration

Calls the dialog for configuring the satellite data (see chapter 3.2, "Satellite Configura-

tion", on page 39).

SCPI command:

n.a.

Real-Time S.P.O.T.

Calls the dialog for real-time display of the current PDOP and HDOP values, display of

the satellites states and position and display of the receiver position (see Real-Time

S.P.O.T.).

SCPI command:

n.a.

Assistance Data Generation

(enabled with option Assisted GPS (R&S-K65) only)

This button is available only for "Localization Mode" set to "Full Configuration".

Calls the dialog for generation of assistance data (see chapter 3.4, "Assistance Data

Generation", on page 52).

SCPI command:

n.a.

3.2 Satellite Configuration

In the Satellite Configuration menu, the signal simulation of up to four satellites per path

can be activated and configured, i.e. four satellites for one path instrument and eight

satellites for two path instruments.

The GPS implementation in the R&S WinIQSIM2 is a simplified offline version of the real-

time GPS option. The offline version provides the possibility to generate an one-satellite

generic signal, i.e. only one satellite can be activated and configured.

Satellite Configuration

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Case K44 Spécifications Page 53