采用2019年12月26 H 73个MGEX站的观测数据,从可见卫星数、收敛时间和定位精度等角度对比分析了BDS-2、GPS单系统静态PPP性能,实测数据分析表明:1)GPS卫星在全球范围内有97.3%的区域可见卫星数在8颗及以上,70%的区域可见卫星数在10颗及...采用2019年12月26 H 73个MGEX站的观测数据,从可见卫星数、收敛时间和定位精度等角度对比分析了BDS-2、GPS单系统静态PPP性能,实测数据分析表明:1)GPS卫星在全球范围内有97.3%的区域可见卫星数在8颗及以上,70%的区域可见卫星数在10颗及以上;而对于BDS-2,服务区范围内73%的区域可见卫星数在5颗及以上,有56.9%的区域可见卫星数在8颗及以上;2)BDS-2、GPS单系统平均收敛时间分别为62.7min、36.6min;3)GPS单系统3h时段的定位精度优于4cm,而BDS-2的定位偏差达到了6.6cm,约为GPS的1.6倍;4)随着观测时长增加,两者的定位精度均有不同程度的提高,在24 h时段,GPS精度优于2cm,BDS-2精度优于5 cm。展开更多
A modified algorithm of combined GPS/GLONASS precise point positioning （GG-PPP） was developed by decreasing the number of unknowns to be estimated so that accurate position solutions can be achieved in the case of l...A modified algorithm of combined GPS/GLONASS precise point positioning （GG-PPP） was developed by decreasing the number of unknowns to be estimated so that accurate position solutions can be achieved in the case of less number of visible satellites. The system time difference between GPS and GLONASS （STDGG） and zenith tropospheric delay （ZTD） values were firstly estimated in an open sky condition using the traditional GG-PPP algorithm. Then, they were used as a priori known values in the modified algorithm instead of estimating them as unknowns. The proposed algorithm was tested using observations collected at BJFS station in a simulated open-pit mine environment. The results show that the position filter converges much faster to a stable value in all three coordinate components using the modified algorithm than using the traditional algorithm. The modified algorithm achieves higher positioning accuracy as well. The accuracy improvement in the horizontal direction and vertical direction reaches 69% and 95% at a satellite elevation mask angle of 50°, respectively.展开更多
The mining area deformation monitoring theory and method using precise point positioning （PPP） ambi- guity resolution （AR） were studied, and an ambiguity fixing model with satellite and receiver combina- tion phas...The mining area deformation monitoring theory and method using precise point positioning （PPP） ambi- guity resolution （AR） were studied, and an ambiguity fixing model with satellite and receiver combina- tion phase delay （CPD） was proposed for zero-differenced PPP ambiguity fixing and its corresponding formula derivation was given. The data processing results for I h at six IGS stations in China show that 93% of ambiguities can be fixed within 10 min and all ambiguities can be fixed within 15 min. After ambi- guity fixing, the positioning accuracy is improved by more than 85% in the E and N directions, with abso- lute positioning accuracy reaching millimeter level, and it was improved by 70% in the U direction, reaching centimeter level; the proposed zero-differenced ambiguity fixing model can effectively improve the convergence rate and positioning accuracy in PPP. Data monitoring continuously conducted for half a year at four COPS stations of Shanxi China Coal Pingshuo Group validated the feasibility of using PPP in mining area deformation monitoring.展开更多
文摘采用2019年12月26 H 73个MGEX站的观测数据,从可见卫星数、收敛时间和定位精度等角度对比分析了BDS-2、GPS单系统静态PPP性能,实测数据分析表明:1)GPS卫星在全球范围内有97.3%的区域可见卫星数在8颗及以上,70%的区域可见卫星数在10颗及以上;而对于BDS-2,服务区范围内73%的区域可见卫星数在5颗及以上,有56.9%的区域可见卫星数在8颗及以上;2)BDS-2、GPS单系统平均收敛时间分别为62.7min、36.6min;3)GPS单系统3h时段的定位精度优于4cm,而BDS-2的定位偏差达到了6.6cm,约为GPS的1.6倍;4)随着观测时长增加,两者的定位精度均有不同程度的提高,在24 h时段,GPS精度优于2cm,BDS-2精度优于5 cm。
基金Project(41004011)supported by the National Natural Science Foundation of ChinaProject(2014M550425)supported by the China Postdoctoral Science Foundation
文摘A modified algorithm of combined GPS/GLONASS precise point positioning （GG-PPP） was developed by decreasing the number of unknowns to be estimated so that accurate position solutions can be achieved in the case of less number of visible satellites. The system time difference between GPS and GLONASS （STDGG） and zenith tropospheric delay （ZTD） values were firstly estimated in an open sky condition using the traditional GG-PPP algorithm. Then, they were used as a priori known values in the modified algorithm instead of estimating them as unknowns. The proposed algorithm was tested using observations collected at BJFS station in a simulated open-pit mine environment. The results show that the position filter converges much faster to a stable value in all three coordinate components using the modified algorithm than using the traditional algorithm. The modified algorithm achieves higher positioning accuracy as well. The accuracy improvement in the horizontal direction and vertical direction reaches 69% and 95% at a satellite elevation mask angle of 50°, respectively.
基金Financial support from the National Natural Science Foundation of China (No. 41074010)the Jiangsu Innovation Works Fund of Postgraduate (No. CXZZ11-0299)the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘The mining area deformation monitoring theory and method using precise point positioning （PPP） ambi- guity resolution （AR） were studied, and an ambiguity fixing model with satellite and receiver combina- tion phase delay （CPD） was proposed for zero-differenced PPP ambiguity fixing and its corresponding formula derivation was given. The data processing results for I h at six IGS stations in China show that 93% of ambiguities can be fixed within 10 min and all ambiguities can be fixed within 15 min. After ambi- guity fixing, the positioning accuracy is improved by more than 85% in the E and N directions, with abso- lute positioning accuracy reaching millimeter level, and it was improved by 70% in the U direction, reaching centimeter level; the proposed zero-differenced ambiguity fixing model can effectively improve the convergence rate and positioning accuracy in PPP. Data monitoring continuously conducted for half a year at four COPS stations of Shanxi China Coal Pingshuo Group validated the feasibility of using PPP in mining area deformation monitoring.
