iGMAS BDS-3观测数据质量建模与应用

Modeling and application of iGMAS BDS-3 observation data quality

针对目前已有全球导航卫星系统(GNSS)数据质量分析软件模型中存在的可视化和批处理问题,提出了利用公式翻译器(Fortran)语言开发一款全球连续监测评估系统(iGMAS)多GNSS数据质量分析软件(MGQA)。该软件拥有可视化操作界面和批处理功能,可对多GNSS卫星信号数据从数据完整率、信噪比、多路径效应误差、电离层延迟变化率、周跳五个方面进行质量分析。采用该软件和GNSS数据预处理软件(TEQC)分别对全球定位系统(GPS)卫星观测数据质量进行评价,以TEQC的GPS数据质量分析结果为准确值,对比MGQA与TEQC软件质量分析结果,数据完整率中误差为0.27、信噪比中误差为0.85 dB、多路径效应误差中误差为0.046 m、电离层延迟变化率中误差为0.01 m/min、周跳中误差为1.67,二者结果具有高度一致性,验证了MGQA软件的有效性。基于iGMAS跟踪站观测数据,利用该软件对iGMAS各跟踪站接收BDS-3卫星信号的能力进行评价。结果表明:GNSS-GGR接收机在数据完整率方面表现的不如UB4B0-13478、CETC-54-GMR-4016以及CETC-54-GMR-4011接收机,CETC-54-GMR-4016接收机抗多路径能力较差,UB4B0-13478接收机削弱电离层延迟能力较差,GNSS-GGR接收机与CETC-54-GMR-4011接收机易发生周跳,且4种类型接收机对BDS-3卫星B2a频点信号的接收能力要强于B1C频点。

In order to solve the visualization and batch processing problems of existing global navigation satellite system(GNSS)data quality analysis software,an international GNSS monitoring and assessment system(iGMAS)Multi-GNSS data quality analysis(MGQA)software was developed based on Fortran language.This software had visual operation interface and batch processing function and could analyze the quality of Multi-GNSS satellite signal data from five aspects:data integrity rate,signal-to-noise ratio,multipath effect error,ionospheric delay change rate and cycle slip.The software and translation,editing and quality checking(TEQC)software were applied to evaluate the quality of global positioning system(GPS)satellite observation data respectively.Taking the GPS data quality analysis result of TEQC as the accurate value,comparing the MGQA and TEQC software quality analysis results.The mean square error of data integrity rate was 0.27,the mean square error of signal-to-noise ratio was 0.85 dB,the mean square error of multipath effect error was 0.046 m,the mean square error of ionospheric delay change rate was 0.01 m/min,and the mean square error of cycle slip was 1.67.The two results were highly consistent,which verified the effectiveness of MGQA software.Based on the observation data of iGMAS tracking station,the software was explored to evaluate the ability of iGMAS tracking stations to receive BDS-3 satellite signals.The results showed that GNSS-GGR receiver was inferior to UB4B0-13478,CETC-54-GMR-4016 and CETC-54-GMR-4011 receivers in terms of data integrity.CETC-54-GMR-4016 receiver had poor anti multipath ability,UB4B0-13478 receiver had poor ability to weaken ionospheric delay,and GNSS-GGR receiver and CETC-54-GMR-4011 receiver were prone to cycle hopping,And the receiving ability of the four types of receivers for BDS-3 satellite B2a frequency point signal was stronger than B1C frequency point signal.