Operating Manual Vol 1 - ES Documentation

Digital Standard GPSSMIQFig. 2-213DIGITAL STD - GPS menuDOPPLER SHIFTSets the desired Doppler shift of the GPS signal. This affects the symbol rateused as well as the frequency shift of the carrier signal.IEC/IEEE-bus command :SOUR:GPS:DSH 0SYMBOL RATERESULTING SYMBOLRATERESULTINGFREQUENCYC/A CODENAVIGATION DATASOURCESets the basic value of the symbol rate for zero Doppler, i.e. without Dopplershift. This value is used to calculate the actual symbol rate as a function of theDoppler shift set. At a Doppler shift of 0 Hz, the values of SYMBOL RATE andRESULTING SYMBOL RATE (see below) are identical.IEC/IEEE-bus command:SOUR:GPS:SRAT 1023000.0Displays the physical symbol rate currently used. The value is obtained fromthe set frequency, the Doppler shift and the set basic symbol rate for zeroDoppler according to the following equation:fSymbolresulting f = ∗ +DopplerfSymbol1 ZeroDoppler FREQ IEC/IEEE-bus command:SOUR:GPS:CURR:SRAT?Displays the physical carrier frequency currently output. The value is obtainedfrom the sum of the set frequency under FREQ and Doppler shift according tothe following equation:f = FREQ +f DopplerIEC/IEEE-bus command :SOUR:GPS:CURR:FREQ?Sets the C/A code for spreading the navigation data. This clearly defines thesimulated GPS satellite.IEC/IEEE-bus command :SOUR:GPS:CODE 1Selects the navigation data source. Either simple bit patterns (see PATTERN)or more complex data lists (see DATA LIST) with GPS-specific navigation data(ephemeris and almanac), for example, can be selected.IEC/IEEE-bus command :SOUR:GPS:DATA PATT1125.5555.03 2.338E-9