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
- PDF / 991,518 Bytes
- 12 Pages / 439.37 x 666.142 pts Page_size
- 55 Downloads / 247 Views
Analysis Method for GNSS Signal Quality Based on Constellation Diagram Ying Wang, Zhe Su, Yansong Meng and Xiaoxia Tao
Abstract 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. Keywords Constellation diagram
Satellite navigation Signal quality
28.1 Introduction Users’ receivers realize navigation, positioning and timing function, relying on the signal broadcasted by satellite navigation system, so the quality of satellite navigation signals plays a key role in the evaluation of a satellite navigation system Y. Wang (&) Z. Su Y. Meng X. Tao China Academy of Space Technology (Xi’an), Xi’an 710100, China e-mail: [email protected] Z. Su e-mail: [email protected] Y. Meng e-mail: [email protected] X. Tao e-mail: [email protected]
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume I, Lecture Notes in Electrical Engineering 303, DOI: 10.1007/978-3-642-54737-9_28, Springer-Verlag Berlin Heidelberg 2014
315
316
Y. Wang et al.
performance. China Beidou Satellite Navigation System (BDS) is rapidly developed recently, and plans to use more complex modulation and combining method. In this case, the general vector signal analyzers and other instruments are not sufficient to fully reflect the signal performance, and therefore it is necessary to develop an intuitive vector signal quality measurement method. In this study, the satellite navigation signals were compared with the general communication signals, and the constellation diagram was proposed for the analysis of satellite navigation signal quality. This method is suitable for the evaluation of signal design and signal transmission signal quality when high SNR (Signal to Noise Ratio) and a large amount of data conditions. The method can be integrated and more finely examines the amplitude and phase information of all the signals added to one frequency carrier, analyzes the error between the theoretical limit and real signal, and evaluates the phase relationship between the signals from various quarters in the combined signal.
28.2 Features of Satellite Navigation Signals Constellation diagram is developed from the motion of signal along with time and any one-dimension signal can be expressed as a time-variable function of the amplitude and phase. This paper will be focused on the baseband signal.
28.2.1 The Difference
Data Loading...
