Analysis of Multipath Effect on the Antennas of CORS Receivers
Though state-of-the-art Trimble dual-frequency receivers are employed in Continuously Operating Reference Stations (CORS) in China [1 ], the accuracy of CORS coordinate are affected by multipath, receiver noise, etc., while multipath is generally consider
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Analysis of Multipath Effect on the Antennas of CORS Receivers Shengjia Tang, Hui Liu and Shujing He
Abstract Though state-of-the-art Trimble dual-frequency receivers are employed in Continuously Operating Reference Stations (CORS) in China [1], the accuracy of CORS coordinate are affected by multipath, receiver noise, etc., while multipath is generally considered as the main contributor. To make a wisely choice on receivers and antennas in the construction of CORS, Trimble NetR5 with TRM55971.00 antenna and Trimble R8 Model 2 with TRM60158.00 antenna, which are common used, are selected to making a comparison in terms of multipath effect. The same data is calculated by TEQC for the sake of validating the algorithm this paper used. The answer shows that the multipath effect of Trimble NetR5 is better than R8 Model 2 about 12 % in the same place in adjacent days. What’s more, to ensure that Trimble NetR5 has a stable performance, the multipath effect time series of an IGS station is calculated. Keywords Multipath effect
CORS TEQC Antenna Trimble
This paper was funded by the National high technology research and development plan (863 Program), 2007AA12Z309; The National Basic Research Program of China (973 Program) (2007CB310805). S. Tang (&) H. Liu GNSS Research Center, Wuhan University, No.129, Luoyu Road, Wuhan 430079, China e-mail: [email protected] H. Liu e-mail: [email protected] S. He Fujian Institute of Surveying and Mapping, Fuzhou, Fujian Province 350003, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 244, DOI: 10.1007/978-3-642-37404-3_30, Ó Springer-Verlag Berlin Heidelberg 2013
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30.1 Introduction Multipath effects are inevitable for the reflections from ground and surfaces of other objects [2]. Moreover, due to complicated conditions of observation, there are no universal effective algorithms in eliminating multipath effects. To decrease the effects of multipath, and increase the quality of observation data, 10 or more degree of elevation mask and anti-multipath antennas technique are usually adopted [3]. Trimble NetR5 GNSS infrastructure receiver with TRM55971.00 antenna, designed as a permanent reference station for use in Trimble VRS network, is common employed in CORS in China, such as GDCORS, JXCORS. And Trimble R8 Model 2 with TRM60158.00 antenna is an integrated system and widely used in GNSS project. Both receivers can track all GPS signals (L1/L2/L5) as well as GLONASS(L1/L2). By finishing the pre-treatment of observation files of 2 receivers, and contrasting the result TEQC calculated, an overall analysis is made including the relationship between multipath value and satellite elevation, multipath effects on different types of antennas.
30.2 Preliminaries 30.2.1 Cycle Slip Detection Before calculate the multipath value of each epoch, observation data must be cleaned by detecting cycle slips and deleting the gross error and bad epoch. A method integrating M-W combinat
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