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大地测量与地球动力学 2024年第5期44卷 468-472,478页

作者：蓝敏益高成发东南大学交通学院南京市211189

针对国内外无CORS站服务地区存在的定位精度低、可靠性差等问题,提出一种利用智能手机设立自设基站进行差分定位的方法。该方法使用外接天线来提升智能手机GNSS观测数据质量,并使用射频屏蔽箱等设备共同组成自设基站。采用智能手机华为M... 详细信息

针对国内外无CORS站服务地区存在的定位精度低、可靠性差等问题,提出一种利用智能手机设立自设基站进行差分定位的方法。该方法使用外接天线来提升智能手机GNSS观测数据质量,并使用射频屏蔽箱等设备共同组成自设基站。采用智能手机华为Mate40作为流动站,分别同传统CORS基准站和自设基站进行RTK定位,并设计静态、步行、骑车3组实验来评估自设基站的服务能力。实验结果表明,静态实验中,智能手机华为Mate40同自设基站的RTK定位精度可达cm级;动态实验中,智能手机华为Mate40分别同自设基站、CORS基准站差分的RTK定位精度均能达到dm级,2种方式的平面定位精度差异在0.1 m左右。基于智能手机的自设基站能够提供稳定的基准站服务,满足特定场景下的测绘工作需求。

关键词：智能手机自设基站相对定位精度分析

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北斗四频中长基线模糊度解算研究

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南京信息工程大学学报（自然科学版） 2024年第1期16卷 137-144页

作者：曹相张杰高成发邵沛涵南京市计量监督检测院南京210049 东南大学交通学院南京211189

随着北斗三号卫星导航系统完成全球组网并正式开通,中国已成为世界上第3个独立拥有全球卫星导航系统的国家.目前BDS-3卫星可播发5个频点的观测信号,研究BDS-3多频组合对于实现模糊度快速固定、提高定位精度具有重要意义.针对中长基线解... 详细信息

随着北斗三号卫星导航系统完成全球组网并正式开通,中国已成为世界上第3个独立拥有全球卫星导航系统的国家.目前BDS-3卫星可播发5个频点的观测信号,研究BDS-3多频组合对于实现模糊度快速固定、提高定位精度具有重要意义.针对中长基线解算,本文充分利用BDS-3四频中存在电离层延迟极小且具有整数特性的组合,同时考虑对流层延迟的影响,建立了基于弱电离层组合的中长基线解算模型.实验结果表明,相比于传统双频无电离层模型,该模型的模糊度固定速度提高10%以上,N、E、U 3个方向定位精度相比最优双频无电离层组合分别提高了7.7%、7.9%、8.2%.

关键词： BDS-3 四频模糊度解算长基线

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北斗三号带状CORS系统基准站布设距离研究

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测绘工程 2024年第1期33卷 62-70页

作者：王剑超高成发刘濛濛尚睿张瑞成王付有东南大学交通学院南京211189

针对传统的CORS系统在高速公路等带状区域场景下存在的定位性能不足问题,尝试通过构建单站RTK和多站VRS结合的带状CORS系统从而提升定位性能,并实地采集多组不同基线长度的北斗三频观测数据,测试在满足平面2 cm、高程3 cm的最大定位误... 详细信息

针对传统的CORS系统在高速公路等带状区域场景下存在的定位性能不足问题,尝试通过构建单站RTK和多站VRS结合的带状CORS系统从而提升定位性能,并实地采集多组不同基线长度的北斗三频观测数据,测试在满足平面2 cm、高程3 cm的最大定位误差前提下,该种CORS服务模式下基站的合理布设距离。实验结果表明,在开阔、轻微遮挡和中度遮挡环境下,满足该定位精度的基线长度分别可以达到30 km、19.7 km、15 km,而对于更长的基线,其定位精度及模糊度固定成功率均明显下降,不能保证定位的可靠性。

关键词：带状场景地基增强系统北斗卫星系统 RTK定位站间布设距离

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Single-epoch Integer Ambiguity Resolution for Long-Baseline RTK with Ionosphere and Troposphere Estimation

Single-epoch Integer Ambiguity Resolution for Long-Baseline ...

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第四届中国卫星导航学术年会

作者： Denghui Wang chengfa gao Shuguo Pan School of Transportation Southeast University School of Instrument Science and Engineering Southeast University

A new single-epoch ambiguity resolution for long baseline RTK, on the basis of the ionosphere-weighted model, is proposed in this paper, which is applicable to several hundred km baselines by using linear combination of the measurements, including the double-different wide-lane combination and ionosphere-free combination carrier-phase observation equations and UofC model. By the correct ambiguity and double-different atmosphere delay, the real-time atmosphere model was established to provide a predicted value for new-risen satellite. The establishment of real-time atmosphere predicted model, estimating the relative tropospheric zenith delay and the regional ionospheric parameters, is proved to have an acceptable accuracy. Test data from the multiple reference station GPS networks in Chongqing, consisting of 36 baselines from 40 kilometers to 350 kilometers, were used to evaluate the performance of the proposed approach. It is showed that the proposed algorithm can reduce the effect of the ionosphere and troposphere on the network AR and the true integer ambiguity could be achieved in a short time after the establishment of the predicted atmosphere model.

关键词： Ambiguity resolution Network RTK UofC Real-time atmosphere model

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Wide-lane Ambiguity Fixing Method Based on BDS Triple Frequency Observations

Wide-lane Ambiguity Fixing Method Based on BDS Triple Freque...

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第九届中国卫星导航学术年会

作者： Jianjian Jin chengfa gao Bo Chen School of Transportation Southeast University

In this paper, based on the characteristics of easy to fix the ambiguity of Bei Dou triple frequency ultra-wide lane, a fast solution method of wide lane ambiguity of BDS/GPS dual system based on Bei Dou triple frequency is proposed. Firstly, the combination ambiguity of Bei Dou(0,-1, 1) ultra-wide lane is fixed by using combination of wide-lane carrier and narrow-lane pseudo-range;Then, according to the principle of least squares, the ambiguity of Beidou(1,4,-5) ultra wide lane is solved by constraint;Next, the ambiguities of Beidou(1,-1, 0) and(1,0,-1) wide lane can be obtained by linear combination of the two ambiguities of fixed ultra wide lane;Considering the effects of tropospheric and ionospheric errors on long and medium baselines, the combined wide-lane ambiguity of Beidou(1, 0,-1) is taken as the optimal constraint, which is brought into the comprehensive constraint model to realize the fixed solution of GPS wide-lane ambiguity. Experimental results show that the method proposed in this paper can quickly fix the ambiguity of wide-lane GPS. Compared with the traditional MW method, this method greatly reduces the number of primitive epochs needed to correctly fix the wide-lane ambiguity, and improve timeliness of GNSS ambiguity resolution.

关键词： Triple-frequency Integer ambiguity Wide lane constraint BDS GPS

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Assessment of GPT2 Empirical Troposphere Model and Application Analysis in Precise Point Positioning

Assessment of GPT2 Empirical Troposphere Model and Applicati...

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第五届中国卫星导航学术年会

作者： Weirong Chen chengfa gao Shuguo Pan School of Transportation Southeast University School of Instrument Science and Engineering Southeast University

Precise Point Positioning （PPP） has been demonstrated to be a powerful tool in geodetic applications, such as deformation monitoring. Troposphere delay is an important error source which directly affects positioning accuracy in height direction. At the end of 2012, an improved model named Global Pressure and Temperature 2 （GPT2） was proposed. Compared with early empirical models, this new model mainly eliminates the weakness of limited spatial and temporal variability. In this study, we assess the precision of GPT2 model and apply it in PPP analysis. The analysis data of VMF1, which is produced using European Centre for Medium-Range Weather Forecasts （ECMWF）, provides the nearly true value of zenith delays and mapping function for International GNSS Service （IGS） stations. Therefore a globally distributed set of 11 IGS stations is chosen to validate GPT2 model. In the case of using GPT2 as a priori model while the residual zenith delay still estimated with other unknown parameters, it would improve the zenith troposphere delay adjustments to nearly zero-mean. Therefore GPT2 is helpful to improve the efficiency in PPP data processing. However, GPT2 model is only resting upon a global 5 degree grid and sufficient global troposphere models are not yet available. Due to the complexity of wet zenith delay, PPP height solutions would be unsatisfactory when residual troposphere delay is not parameterized. We conclude that GPT2 is capable of predicting troposphere delay worldwide with an acceptable uncertainty. And GPT2-based PPP solution performs well only in the case of regarding residual model error as an additional unknown parameter.

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Application of Fitting of Moving Quadric Surface to height anomaly fitting in the bandshaped area

Application of Fitting of Moving Quadric Surface to height a...

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第十一届中国卫星导航年会

作者： Puyu Sun chengfa gao Xinde Zhai Yongsheng Liu School of Transportation Southeast University Changjiang Waterway Bureau

Global Navigation Satellite System(GNSS), whichcan provide highprecision coordinates in the global geodetic framework, is able to replace most geodetic surveying, but it is difficult to replace conven

关键词： Quasi-geoid Height anomaly Fitting of Moving Quadric Surface Leveling surveying

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Ill-posedness Analysis of Ambiguity Resolution Using BDS-2 and Its Fusion with GPS

Ill-posedness Analysis of Ambiguity Resolution Using BDS-2 a...

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第五届中国卫星导航学术年会

作者： Wang gao chengfa gao Shuguo Pan Shengli Wang Xiaofei Shi School of Transportation Southeast University School of Instrument Science and Engineering Southeast University

Different from GPS or GLONASS, BDS （BeiDou Navigation Satellite System） consists of not only MEO satellites but GEO and IGSO satellites, both of which are high-orbit satellites. Now BDS has finished its second step of the all three steps, and can provide regional navigation and positioning service. BDS-2 now mainly consists of 5 GEO, 5 IGSO and 4 MEO satellites. For most places of China, the GEO satellites always gather in a south part of the visible satellites sky plot. The IGSO satellites are also often seen in the south part. These lead into poor satellite geometry. Besides this, the running angular velocities of GEO and IGSO satellites are much smaller compared with MEO satellites. This results in that the geometric relationship between the satellite and the station changes slowly, so that there exists strong correlation between the observation equations from adjacent epochs. The poor satellite geometry and the small velocities make the ambiguity resolution （AR） of BDS-2 be a more serious ill-posed problem. In this paper the ill-posedness of the AR of BDS-2 was analyzed. And on this basis, some different combinations of GEO, IGSO and MEO satellites of BDS-2 were used in the AR experiments to reveal the characteristic of ill-posedness. AR experiment of GPS was also carried out at the same time for comparison with BDS-2. At last, the fusion AR experiment of BDS and GPS was done. From these experiments we concluded that BDS-2 AR which mainly relied on high-orbit satellites is a serious ill-posedness problem, so it takes much more time than GPS. The fusion with GPS will make the problem change much better.

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The Analysis of Ill Posedness in GNSS High-Precision Differential Positioning

The Analysis of Ill Posedness in GNSS High-Precision Differe...

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第四届中国卫星导航学术年会

作者： Wang gao chengfa gao Shuguo Pan Shengli Wang Denghui Wang School of Transportation Southeast University School of Instrument Science and Engineering Southeast University

GNSS high precision differential positioning generally requires the high-precision float solution and the reasonable covariance matrix for ambiguity integers in short observational time spans. But station-star geometric changes little in short observational time spans, which causes the design matrix to be ill-conditioned seriously during adjustment calculation and lead to the solving of parameter is unstable. With the development of Compass Navigation Satellite System, the GNSS high-precision positioning is now entering the multi-system combined ages. GPS, GLONASS and Compass have different orbits and operating features so that there is some difference from each other in adjustment calculation. The paper combining with the analysis theory on ill-conditioned system, analyses the ill-posedness of GPS, GLONASS and Compass comparatively through a method called spectrum analysis of eigenvalue. The paper reveals the characteristics of the ill-conditioned in several different positioning forms. The conclusion that the faster the satellites runs, the weak the ill-posedness of the parameters solving system will be is presented.

关键词： GNSS double differential positioning Ill posedness Algebraic structure spectrum analysis

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Rapid Ambiguity Resolution Algorithm for Multi-constellation between Reference Stations Based on Ambiguity Tight Constraint

Rapid Ambiguity Resolution Algorithm for Multi-constellation...

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第九届中国卫星导航学术年会

作者： Ruicheng Zhang chengfa gao Shuguo Pan Zhiyue Yan Qing Zhao School of Transportation Southeast University School of Instrument Science and Engineering Southeast University

The development of multi-GNSS remarkably increased the number of available satellites, but how to solve the multi-dimensional ambiguity parameters quickly and accurately in network RTK technology is still an issue full of perplexity and significance. To ensure the virtual station have more available satellites under the occlusion environment, a fast ambiguity resolution method for base station based on ambiguity tight constraint was proposed in this paper. Firstly, the optimal subset of ambiguity is selected by partial ambiguity resolution(PAR) strategy, and then impose strong constraints on the ambiguities of these satellites. Finally, update the filter equation and assist in fixing the ambiguity of other satellites. The real measured baseline data which contain GPS, BDS and GLONASS from Tianjin CORS and Curtin University was used in the experiments, and the results illustrated that this method could significantly shorten the initialization time of ambiguity between base stations, accelerate the convergence speed of newly-arisen satellites, and increase the number of available satellites of RTK virtual observations(especially low-elevation angle satellites), that providing a reliable guarantee for high-precision positioning in the occlusion environment, such as the roads in cities.

关键词： Rapid Ambiguity Resolution Multi-GNSS Reference Station Tight Constraint Partial Ambiguity Resolution（PAR）

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