The Data Quality Check Methods Of IGMAS Monitoring Receiveand Software Implementation

The development of the Beidou Navigation System(BDS) led to the evolution ofiGMAS.The full name of iGMAS is international GNSS Monitoring&Analysis Service.Theservice of iGMAS is similar to IGS(international GNSS Service) which provide the data ofnavigation system and precise products all over the world.The main difference between them isthat IGS could only provide the data of GPS and GLONASS,iGMAS could provide the data offour navigation systems which are GPS、GLONASS、BDS、Galileo.The publishing of BDS ICD led to the development of iGMAS chips and receiver,and whatif the ability of positiong which provided by iGMAS receiver which belong to the data quality.Based on the above needs, this paper took the comparison and test tasks of several iGMASreceiver,that is analyze the data quality of iGMAS data,and do positioning to determine whetherit could provide basic service.Based on these requirements,this paper did a study include the following three points:(1) Data quality checkData quality check including the integrity of data、multipath、cycle slip.This paper studiedthe methoeds of cycles slip detection、multipath calculation and so on.Measured the qualitycheck of GPS、GLONASS data using TEQC,and measured the quality check of BDS data usingBNC which improved by me.(2) Positioning solutionThe positioning solution contain zero-difference precise point positioning anddouble-difference relative positioning.It is studied that these two ways of positioning in thispaper,and caculated the data using these two ways,and do assessment from the inside andoutside accuracy.These results was given by Bernese5.0.The main contribution of this paper:Improved BNC which is open source,made it could identify BDS and read the data of BDScorrectly,and could calculate the multipath of every satellite.and also could calculate the positionof GEO satellites,and finally did the quality check of BDS...