Abstract:

According to the modulation characteristics of BeiDou signal, the time do main quality of Beidou B1 frequency band signal was assessed from the time-domain waveforms, eye diagrams of Beidou B1 frequency signal and other aspects by using offline data analysis method, and theoretical analysis combined with real signal test. The feasibility of the evaluation method was verified and a relatively perfect time domain evaluation method was obtained to provide a basis for checking the signal time domain distortion. Besides, in order to measure the degree of signal distortion, three parameters were calculated, namely, lead/lag parameters in TMA, resonance frequency and attenuation factor in TMB, derived from the 2OS model adopted in Annex 10 of the Convention on International Civil Aviation issued by ICAO. The relationship between ranging bias and these parameters was analyzed to provide criteria for evaluating the single-satellite signal quality in time-domain.

Key words:

satellite navigation system, signal quality monitor, time domain, signal distortion, offline data analysis