Deformation Characteristics of COMPASS Satellite Signals

Stanford University’s study declare that navigation signals of healthy satellite may be deformed which results in ranging bias, so micro-deformation characteristics of COMPASS satellite signal is studied based on measured data. Using of periodicity of PRN code for civil signals, data is collected at sampling rate which the interval of first point of each PRN code from the starting point is fixed. Rearranging the data, which makes that several PRN code waveforms in one data code incorporate into one PRN code waveform, so each chip has enough data points and data rate increases. A large-diameter dish antenna is used, and initial phase, frequency, secondary code and information code of sampling data are removed, then data is rearranged into one PRN code period, then average for noise reduction. Finally the clean COMPASS satellite signal waveform is compared with the real GPS satellite signal waveform and the TMB fault model.