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Title: Improved weighting scheme using consumer-level GNSS L5/E5a/B2a pseudorange measurements in the urban area
Authors: Ng, HF 
Zhang, G 
Yang, KY
Yang, SX
Hsu, LT 
Issue Date: 1-Oct-2020
Source: Advances in space research, 1 Oct. 2020, v. 66, no. 7, p. 1647-1658
Abstract: The accurate global navigation satellite system (GNSS) positioning in the dense urban areas is still a challenge, especially for low-cost receivers. The multipath effects and non-line-of-sight (NLOS) receptions from surrounding buildings will significantly degrade the positioning performance. Due to the increasing channel number in GNSS chip, the low-cost receiver tends to be capable of acquiring multi-frequency signals, including the new L5-band signal. Because of the higher chipping rate, the GNSS L5-band measurement is less affected by the multipath effect, whereas the measurement number is limited in the current stage. On the contrary, the availability of the conventional L1-band measurement is sufficient to achieve a good dilution of precision (DOP). Based on the complementary characteristics, a GNSS L1/L5 bands integrated positioning algorithm is developed in this study to improve the positioning performance in urban areas. A modified weighting model based on carrier-to-noise ratio and satellite elevation angle is employed to assign proper weighting between L1-band and L5-band measurements. Meanwhile, the dMP5 feature from dual-frequency measurement and the consistency check algorithm are employed to detect and exclude outliers, which are possibly NLOS receptions. Experimental results and analyses indicate that the developed DFE-CCWLS method can significantly improve the positioning accuracy, achieving the root-mean-square error less than 10 m for most of the urban scenarios.
Keywords: GNSS
GNSS L5-band
Urban canyon
Publisher: Pergamon Press
Journal: Advances in space research 
EISSN: 0273-1177
DOI: 10.1016/j.asr.2020.06.002
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