北斗卫星B1频段信号质量时域评估方法

针对北斗信号的调制特点，用离线数据分析方法,理论分析与实测信号测试相结合，从北斗B1频点信号时域波形、眼图等方面对北斗B1频段信号数据的时域进行了质量分析评估测试，验证了评估方法的可行性，得到相对完善的时域评估方法,为信号时域畸变排查提供依据。此外，为了衡量信号的畸变程度,计算了国际民航组织发布的国际民用航空公约附件10所采纳的2OS模型中的3个参数：数字畸变中的超前/滞后参数、模拟畸变中的谐振频率和衰减因子的数值，并分析了其与测距偏差之间的关系，为单颗星信号质量在时域方面的评估提供了判断依据。

Research ontime domain evaluation method ofBDS B1 band signal quality#br#

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.