Operating Manual Vol 1 - ES Documentation

SMIQDigital Standard GPSFor more detailed information on the content and frame structure of navigation data, as well as C/Acode generation, refer to the following documentation.References:[1] Interface Control Document ICD-GPS-200.[2] Global Positioning System Standard Positioning Service Signal Specification, 2 nd Edition, 1995.2.20.2 GPS MenuThe following graphics show the menu for generating a GPS signal for one satellite. The individual menuitems are explained below:Fig. 2-212STATEDIGITAL STD - GPS menuSwitch-on/off of modulation - digital standard GPS. If vector modulation, digitalmodulation or another digital standard were switched on, they areautomatically switched off.STATE = ON starts the calculation and output of the GPS signal on the basisof the current settings. There are no significant delays until the signal is output,since the signal is generated in realtime.IEC/IEEE-bus command:SOUR:GPS:STAT ONNote:When a parameter is changed (exception: DOPPLER SHIFT and SYMBOL RATE), STATE isautomatically switched to OFF to ensure that the set values and the output signal areconsistent. Once all the values have been changed, STATE can manually be set to ON again.This can be done using the menu parameter STATE or the MOD ON/OFF key below therollkey.SET DEFAULTSets the default setting for GPS:• The DOPPLER SHIFT is set to 0 kHz.• The set SYMBOL RATE is positioned to 1.023 Msps.• The C/A CODE 1 is used.• PATTERN is used as NAVIGATION DATA SOURCE.• The PATTERN is set to 1010101010101010.• All TRIGGER settings are set to default values.IEC/IEEE-bus command :SOUR:GPS:PRES:STAN1125.5555.03 2.335D-9