Analysis Method for GNSS Signal Quality Based on Constellation Diagram

Modern Global Navigation Satellite System (GNSS) signals commonly use very complex modulation and combining method to get diversified and high quality service of navigation, positioning and timing. For that reason, analysis methods of communication signal are not sufficient to reflect navigation signal quality. Based on the analysis of differences between navigation signal and general communication signal, this paper noted concerns and research method of constellation diagram, through real signal generation system, analysed the differences between real signal and ideal signal, proved the method is intuitive and credible through other signal quality analysis methods, and can display more problems of signal generation system and signal quality.