A method for mitigating GNSS multipath effect based on multi-point hemispherical grid model

doi:10.11947/j.AGCS.2020.20190184

Abstract

Abstract: Multipath effect is related to the observational environment of stations, and cannot be eliminated or mitigated by differential algorithm. It is a major factor affecting accuracy and reliability in GPS signal processing. This paper proposes a method to mitigate the multipath effect—MHGM (Multi-point Hemispherical Grid Model). The method divides the hemisphere centered on each station into a grid, and estimates the multipath error at the station based on parametrization of the grid points, which can be applied to different kinds of hardware and software system of GPS data processing and observation environment. The experimental results in this paper show that, MHGM multipath error modeling based on data from observations made improvements in the mean RMS of double-differenced observation residuals averaging about 71.3%, an average increase of 26.9% compared with the traditional sidereal filtering method, the positioning results of 1.7 mm in level and 3.0 mm in altitude are obtained for static observation using real-time kinematic relative positioning mode. MHGM proposed in this paper also can used to assess orientation of error sources around the station, giving guidance which may assist in the physical elimination of sources of multipath error.

Key words: multipath error, sidereal filter, hemisphere, grid model, environmental reconstruction

CLC Number:

P228.4

WANG Yawei, ZOU Xuan, TANG Weiming, CUI Jianhui, LI Yangyang. A method for mitigating GNSS multipath effect based on multi-point hemispherical grid model[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(4): 461-468.

References

[1] HOFMANN-WELLENHOF B, LICHTENEGGER H, WASLE E. GNSS-global navigation satellite systems:GPS, GLONASS, Galileo, and more[M]. Vienna:Springer, 2008.
[2] 黄声享, 李沛鸿, 杨保岑, 等. GPS动态监测中多路径效应的规律性研究[J]. 武汉大学学报(信息科学版), 2005, 30(10):877-880. HUANG Shengxiang, LI Peihong, YANG Baocen, et al. Study on the characteristics of multipath effects in GPS dynamic deformation monitoring[J]. Geomatics and Information Science of Wuhan University, 2005, 30(10):877-880.
[3] ZUMBERGE J F, HEFLIN M B, JEFFERSON D C, et al. Precise point positioning for the efficient and robust analysis of GPS data from large networks[J]. Journal of Geophysical Research, 1997, 102(B3):5005-5017.
[4] 钟萍, 丁晓利, 郑大伟. CVVF方法用于GPS多路径效应的研究[J]. 测绘学报, 2005, 34(2):161-167. DOI:10.3321/j.issn:1001-1595.2005.02.013. ZHONG Ping, DING Xiaoli, ZHENG Dawei. Study of GPS multipath effects with method of CVVF[J]. Acta Geodaetica et Cartographica Sinica, 2005, 34(2):161-167.
[5] 周晓卫, 戴吾蛟, 朱建军, 等. HVF方法在GPS多路径效应研究中的应用[J]. 大地测量与地球动力学, 2007, 27(1):107-111. ZHOU Xiaowei, DAI Wujiao, ZHU Jianjun, et al. HVF method and its application in the study on GPS multipath effects[J]. Journal of Geodesy and Geodynamics, 2007, 27(1):107-111.
[6] 袁林果, 黄丁发, 丁晓利, 等. GPS载波相位测量中的信号多路径效应影响研究[J]. 测绘学报, 2004, 33(3):210-215. YUAN Linguo, HUANG Dingfa, DING Xiaoli, et al. On the influence signal multipath effects in GPS carrier phase surveying[J]. Acta Geodaetica et Cartographica Sinica, 2004, 33(3):210-215.
[7] 范晓燕, 周乾. GPS测量中多路径效应研究综述[J]. 工程地球物理学报, 2010, 7(3):382-386. FAN Xiaoyan, ZHOU Qian. Review of multipath effects in GPS measurement[J]. Chinese Journal of Engineering Geophysics, 2010, 7(3):382-386.
[8] 钟萍, 丁晓利, 郑大伟, 等. 一种基于交叉证认技术的自适应小波变换及其在削减GPS多路径误差中的应用[J]. 测绘学报, 2007, 36(3):279-285. ZHONG Ping, DING Xiaoli, ZHENG Dawei. An adaptive wavelet transform based on cross-validation and its application to mitigate GPS multipath effects[J]. Acta Geodaetica et Cartographica Sinica, 2007, 36(3):279-285.
[9] MEINDL M, SCHAER S, HUGENTOBLER U, et al. Tropospheric gradient estimation at CODE:results from global solutions[J]. Journal of the Meteorological Society of Japan, 2004, 82(1B):331-338.
[10] LAU L, MOK E. Improvement of GPS relative positioning accuracy by using SNR[J]. Journal of Surveying Engineering, 1999, 125(4):185-202.
[11] GENRICH J F, BOCK Y. Rapid resolution of crustal motion at short ranges with the global positioning system[J]. Journal of Geophysical Research, 1992, 97(B3):3261-3269.
[12] BOCK Y, NIKOLAIDIS R M, DE JONGE P J, et al. Instantaneous geodetic positioning at medium distances with the Global Positioning System[J]. Journal of Geophysical Research, 2000, 105(B12):28223-28253.
[13] NIKOLAIDIS R M, BOCK Y, DE JONGE P J, et al. Seismic wave observations with the Global Positioning System[J]. Journal of Geophysical Research, 2001, 106(B10):21897-21916.
[14] RAGHEB A E, CLARKE P J, EDWARDS S J. GPS sidereal filtering:coordinate- and carrier-phase-level strategies[J]. Journal of Geodesy, 2007, 81(5):325-335.
[15] CHOI K, BILICH A, LARSON K M, et al. Modified sidereal filtering:implications for high-ate GPS positioning[J]. Geophysical Research Letters, 2004, 31(22):608-623.
[16] 陈德忠, 叶世榕, 刘炎炎, 等. 基于观测值域的GPS多路径误差应用分析[J]. 武汉大学学报(信息科学版), 2014, 39(2):147-151. CHEN Dezhong, YE Shirong, LIU Yanyan, et al. Applied analysis of GPS multipath errors based on observation domain[J]. Geomatics and Information Science of Wuhan University, 2014, 39(2):147-151.
[17] 郑彬, 周宁, 欧钢. 基于恒星日滤波的PPP多径误差消除研究[J]. 大地测量与地球动力学, 2014, 34(3):178-182. ZHENG Bin, ZHOU Ning, OU Gang. Study on elimination of multipath error in PPP based on sidereal filtering[J]. Journal of Geodesy and Geodynamics, 2014, 34(3):178-182.
[18] ZHONG Ping, DING Xiaoli, YUAN Linguo, et al. Sidereal filtering based on single differences for mitigating GPS multipath effects on short baselines[J]. Journal of Geodesy, 2010, 84(2):145-158.
[19] COHEN C E, PARKINSON B W. Mitigating multipath error in GPS based attitude determination[C]//Proceedings of Guidance and Control 1991. Washington D C:NASA, 1991:53-68.
[20] FUHRMANN T, LUO Xiaoguang, KNÖPFLER A, et al. Generating statistically robust multipath stacking maps using congruent cells[J]. GPS Solutions, 2015, 19(1):83-92.
[21] DONG D, WANG M, CHEN W, et al. Mitigation of multipath effect in GNSS short baseline positioning by the multipath hemispherical map[J]. Journal of Geodesy, 2016, 90(3):255-262.
[22] ELÓSEGUI P, DAVIS J L, JALDEHAG R T K, et al. Geodesy using the Global Positioning System:the effects of signal scattering on estimates of site position[J]. Journal of Geophysical Research, 1995, 100(B6):9921-9934.
[23] ZOU Xuan, WANG Yawei, DENG Chenlong, et al. Instantaneous BDS+GPS undifferenced NRTK positioning with dynamic atmospheric constraints[J]. GPS Solutions, 2018, 22(1):17.
[24] WÜBBENA G, BAGGE A, SEEBER G, et al. Reducing distance dependent errors for real-time precise DGPS applications by establishing reference station networks[C]//Proceedings of the 9th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GPS 1996). Kansas City:Institute of Navigation, 1996:1845-1852.
[25] BOCK Y, PRAWIRODIRDJO L, MELBOURNE T I. Detection of arbitrarily large dynamic ground motions with a dense high-rate GPS network[J]. Geophysical Research Letters, 2004, 31(6):L06604.