Quality Analysis of Observation Data of Conventional Railway Basic Control Network
This paper selected 14 days of observation data from 7 GNSS basic stations in different environments along a conventional railway.Based on evaluation indicators such as data integrity,signal-to-noise ratio,multipath effect,ionospheric delay,and cycle slip,the quality of every frequency observation data from BDS-2,BDS-3,GPS,and Galileo satellites was analyzed.The impact of different railway environments on the observation data quality of reference stations was explored.The results show that,7 GNSS basic stations in different railway environments have consistency in various evaluation indicators,the data integrity of daily observation data is greater than 98%,the pseudorange multipath effect is less than 0.32 m,the average SNR value is between 41～50 dB-Hz,the average IOD-RMS value is less than 0.10 m/min,and the average CSR value is less than 50,all indicators can meet the demand for high-precision positioning along the railway.The performance of Beidou-3 satellites B1C and B2a new signals is equivalent to or even better than that of GPS and Galileo satellites.When selecting GNSS basic stations along the railway line,it is advisable to choose open environments such as building roofs,and choose the weak ground shelter or the environment near the line when the location is difficult.
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