北斗新一代试验星观测数据质量分析

5颗北斗新一代试验星搭载了包括B1C、B2a和B2b的诸多新体制民用信号,并且为了与北斗区域系统平稳过渡而搭载了B1I和B3I两个旧体制信号。采集了来自国内的6个监测站7 d的试验星观测数据,针对信号载噪比和码伪距多路径偏差分析了新一代试验星观测数据质量。结果表明,新一代试验星信号的各项指标整体较北斗区域系统卫星更好。前者载噪比较高,虽然仍发现了部分测站数据微小的多路径波动,但通过实时相位平滑伪距的方法可以很好地消除之;新一代试验星上B3I与B1I频点的载噪比最大,B2a和B2b次之,B1C的载噪比最小,且不同测站的观测结果存在明显差异;新一代试验星各频点的MP基本相同,但B2a、B2b和B3I频点MP的RMS明显小于B1I和B1C频点的结果。

Quality Assessment of the Beidou-3 New Generation Experimental Satellites Observation Data

Five Beidou new generation navigation experimental satellites transmit a number of new open-service signals including B1C,B2a and B2b,meanwhile B1I and B3I for a smooth transition from the Beidou-2 regional system.Observation data in seven days collected from six domestic monitoring stations were analyzed.To assess the quality of these data,indexes like the carrier to noise ratio(CNR) and pseudorange multipath(MP) deviation were discussed.The result shows that the new generation experimental satellites' indicators as a whole are better than those of the Beidou-2 satellites with higher CNRs and weaker MP(multipath) bias.Even though some slight MP fluctuations can still be noticed in the former,it can be eliminated using Code Noise and Multipath Correction (CNMC) algorithm.The B3I and B1I signal have the biggest CNRs,and the B2a and B2b have the bigger one,while that of the B1C is minimum.The MP of each frequency point of the new generation test star is basically the same,but the RMS of B2a,B2b and B3I frequency point MP is obviously smaller than that of B1C.