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A Cooperative Vehicular Technique for Direction

A Cooperative Vehicular Technique for Direction

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第五届中国卫星导航学术年会

作者： Dengyun Lei Weijun Lu Yanbin Zhang DunShan Yu Institute of Microelectronics Peking University School of electronics engineering Beijing University of posts and Telecommunication

Due to the shadowing in the urban environment,the GNSS receiver positioning accuracy is poor which is unable to meet the critical applications in vehicle *** meet the accuracy of relative positioning in critical vehicles application,a variety of wireless ranging methods is being applied to the vehicle ***,they not get the direction information between *** this paper,a method that combines wireless ranging and difference pseudorange is *** method increase the accuracy of direction information in the relative positioning and can be implemented in the case of only 2～3 shared satellites which expand the cooperation positioning *** with traditional method,the variance of Azimuth is reduced by 50%.

关键词： pseudorange difference Direction method Cooperation position

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Analysis of Signal Characteristic and Positioning Performance Affected by pseudorange Multipath for COMPASS

Analysis of Signal Characteristic and Positioning Performanc...

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第四届中国卫星导航学术年会

作者： Feng Zhang Haibo He Bin Tang Fei Shen Rong Chen Beijing satellite navigation center

With the GNSS modernization, the satellite orbit error, the ionospheric delay and the tronospheric delay has been effectively eliminated or reduced, but the multipath error for different users is non-correlation, which can not be removed through differential technique,and then it will be the major error source for GNSS navigation and positioning. Considering COMPASS constellation contains GEO and IGSO satellites, which are high-orbiting satellites, so the multipath effect of COMPASS is different from that of GPS. In order to analyze the multipath effect of high-orbiting satellites, three schemes are adopted in this paper. 1) Model of code tracking multipath error is deduced based on coherent early minuslate delay lock loop, multipath error envelopes are achieved for different bandwidth and different correlation space.2) The multipath effects on pseudo-range is quantitative analyzed based on the satellite signals and multipath signals simulated by the signal source. The performance of anti-multipath is analyzed for the first time with different receivers. 3) The pseudorange multipath effect on the navigation and positioning is analyzed with the observations of Compass receiver through differencial algorithm of short line. The calculation and analysis shows that: pseudorange Multipath of B1 is larger than B3, and pseudorange Multipath of GEO is larger than IGSO and MEO. In static positioning, RMS of Multipath of B1 can reach up to 2.53m, and RMS of Multipath of B3 can reach up to 0.73m.

关键词： Multipath error code tracking simulation analysis narrow correlator pseudorange difference

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