000			01713cam a2200181 4500
100	1		_aNG Hoi-Fung
700			_aZHANG Guohao
700			_aLuo Yiran
700			_aHSU Li-Ta
245			_aUrban positioning: _b3D mapping-aided GNSS using dual-frequency pseudorange measurements from smartphones/ _cHoi-Fung Ng, Guohao Zhang, Yiran Luo, and Li-Ta Hsu
260			_c2021
520			_aA smartphone with a highly sensitive antenna receiving numerous unhealthy measurements suffers from non-line-of-sight (NLOS) reception and multipath effects. 3D mapping-aided (3DMA) GNSS has been proven to be effective in urban environments. However, the multipath effect remains challenging for urban positioning. In nature, the new GNSS civilian L5-band signal with a shorter chip length shows a much better resistibility to multipath than the conventional L1-band signal. Therefore, this study integrated the multi-constellation L5-band measurements into 3DMA GNSS to improve the positioning performance in urban canyons, namely the L1-L5 3DMA GNSS. Furthermore, this study compares different approaches on the receiver clock biases estimation for 3DMA GNSS. Finally, the integration of different 3DMA GNSSs is presented. The experiments conducted using smartphone data show that the L1-L5 3DMA GNSS is available for a better position solution than the 3DMA GNSS with L1-band only, thereby achieving a positioning accuracy within 10 m on average.
650			_a3DMA GNSS _xGNSS L5 _xSMARTPHONES _xURBAN CANYONS _xTECHNOLOGY
773			_aNavigation : _gVol 68 No 4, Winter 2021, pp.727-749 (43)
598			_aTECHNOLOGY
856			_uhttps://navi.ion.org/content/68/4/727 _zClick here for full text
945			_i67161.1001 _rY _sY
999			_c41240 _d41240