To observe the adjacent band spectrum for the GPS signal, repeat the signal at the baseband. Plot the signal power spectral density at the baseband. 'Comparison of Power Spectral Density of GPS baseband I and Q Signals'. IqScope = dsp.SpectrumAnalyzer( 'SampleRate',1.023e6*repeatFactor. IBranchUpsampled = real(IBranchUpsampled(:)) IBranchUpsampled = repmat(IBranchData(:).',repeatFactor/10,1) Repeat the in-phase branch samples ten times less % as every sample in quadrature-branch corresponds to 10 samples in in-phase branch % Repeat the generated BPSK signal of in-phase component to see the % adjacent bands spectrum. QBranchUpsampled = repmat(QBranchData(:).',repeatFactor,1) % Repeat the generated BPSK signal of C/A-code to see the adjacent bands spectrum This figure does not show an actual GPS satellite, and the figure is for illustration only. This figure shows five orbital parameters for a satellite in the Earth-centered Earth-fixed (ECEF) coordinate system. Each GPS satellite transmits its own ephemeris data on subframes 2 and 3 for LNAV data and on message types 10 and 11 for CNAV data. A set of orbital parameters that accurately defines a satellite position in this elliptical orbit is called ephemeris. GPS satellites revolve around the Earth in an elliptical orbit, with Earth at one of the focal points of the ellipse. These errors deviate the satellite clocks from the GPS system time. In practice, deterministic satellite clock error characteristics of bias, drift, and aging as well as satellite implementation characteristics of group delay bias and mean differential group delay exist.

In theory, clocks of all satellites must be synchronized, which implies that all GPS satellite clocks must show the same time at a given moment in time. The property, CEIDataSet, is a configuration object of type HelperGPSCEIConfig, which contains clock, ephemeris, and integrity (CEI) data parameters. TextInMessageType15: 'This content is part of Satellite Communications Toolbox' TextInMessageType36: 'This content is part of Satellite Communications Toolbox' HelperGPSNavigationConfig with properties:

Gps almanac file