This article focuses on the performance analysis of both real-time and post-mission kinematic precise point positioning(PPP)in challenging marine environments.For this purpose,a real dynamic experiment lasting 6 h was...This article focuses on the performance analysis of both real-time and post-mission kinematic precise point positioning(PPP)in challenging marine environments.For this purpose,a real dynamic experiment lasting 6 h was carried out on a lake dam in?orum City of Turkey.While the kinematic test was continuing,the real-time PPP coordinates were obtained for each measurement epoch with a commercial real-time PPP(RT-PPP)service,namely the Trimble Center Point RTX.Then the post-mission PPP(PM-PPP)coordinates were calculated by using Multi-GNSS data and the Multi-GNSS Experiment(MGEX)precise products.The kinematic RT-PPP and PM-PPP results showed that the PPP coordinates were consistent with the relative solution at centimetre and decimetre level in horizontal and height components,respectively.This study implies that PPP technique is a powerful tool for highly accurate positioning in both real-time and post-mission modes,even for dynamic applications in harsh environments.展开更多
各卫星导航系统纷纷将精密单点定位服务作为系统的标准服务向用户提供。BDS-3的精密单点定位服务(PPP-B2b)和QZSS的实验厘米级增强服务CLAS-E(Centimeter Level Augmentation Service for Experiment)已率先向用户提供实时精密单点定位...各卫星导航系统纷纷将精密单点定位服务作为系统的标准服务向用户提供。BDS-3的精密单点定位服务(PPP-B2b)和QZSS的实验厘米级增强服务CLAS-E(Centimeter Level Augmentation Service for Experiment)已率先向用户提供实时精密单点定位服务,但对比分析两系统精密单点定位服务性能的研究较为缺乏。文中以CODE分析中心的最终产品作为参考,对比分析了PPP-B2b与CLAS-E的服务性能;并采用MGEX的4个测站观测数据验证了两种服务的定位性能。结果显示,目前两系统提供的精密单点定位服务均支持厘米级静态定位应用,PPP-B2b在轨道钟差精度、定位精度、收敛时间和服务范围上均稍逊于CLAS-E。CLAS-E播发的改正产品中GPS BLOCK IIF卫星受轨道机动影响,轨道误差会发生跳变。BDS-3仍然在发展建设当中,相信PPP-B2b的服务性能将会进一步提升。展开更多
In this study,the effect of different sampling rates(i.e.observation recording interval)on the Precise Point Positioning(PPP)solutions in terms of accuracy was investigated.For this purpose,a field test was carried ou...In this study,the effect of different sampling rates(i.e.observation recording interval)on the Precise Point Positioning(PPP)solutions in terms of accuracy was investigated.For this purpose,a field test was carried out inÇorum province,Turkey,on 11 September 2019.Within this context,a Geodetic Point(GP)was established and precisely coordinated.A static GNSS measurement was occupied on the GP for about 4-hour time at 0.10 second(s)/10 Hz measurement intervals with the Trimble R10 geodetic grade GNSS receiver.The original observation file was converted to RINEX format and then decimated into the different data sampling rates as 0.2 s,0.5 s,1 s,5 s,10 s,30 s,60 s,and 120 s.All these RINEX observation files were submitted to the Canadian Spatial Reference System-Precise Point Positioning(CSRS-PPP)online processing service the day after the data collection date by choosing both static and kinematic processing options.In this way,PPP-derived static coordinates,and the kinematic coordinates of each measurement epoch were calculated.The PPP-derived coordinates obtained from each decimated sampling intervals were compared to known coordinates of the GP for northing,easting,2D position,and height components.According to the static and kinematic processing results,high data sampling rates did not change the PPP solutions in terms of accuracy when compared to the results obtained using lower sampling rates.The results of this study imply that it was not necessary to collect GNSS data with high-rate intervals for many surveying projects requiring cm-level accuracy.展开更多
文摘This article focuses on the performance analysis of both real-time and post-mission kinematic precise point positioning(PPP)in challenging marine environments.For this purpose,a real dynamic experiment lasting 6 h was carried out on a lake dam in?orum City of Turkey.While the kinematic test was continuing,the real-time PPP coordinates were obtained for each measurement epoch with a commercial real-time PPP(RT-PPP)service,namely the Trimble Center Point RTX.Then the post-mission PPP(PM-PPP)coordinates were calculated by using Multi-GNSS data and the Multi-GNSS Experiment(MGEX)precise products.The kinematic RT-PPP and PM-PPP results showed that the PPP coordinates were consistent with the relative solution at centimetre and decimetre level in horizontal and height components,respectively.This study implies that PPP technique is a powerful tool for highly accurate positioning in both real-time and post-mission modes,even for dynamic applications in harsh environments.
文摘各卫星导航系统纷纷将精密单点定位服务作为系统的标准服务向用户提供。BDS-3的精密单点定位服务(PPP-B2b)和QZSS的实验厘米级增强服务CLAS-E(Centimeter Level Augmentation Service for Experiment)已率先向用户提供实时精密单点定位服务,但对比分析两系统精密单点定位服务性能的研究较为缺乏。文中以CODE分析中心的最终产品作为参考,对比分析了PPP-B2b与CLAS-E的服务性能;并采用MGEX的4个测站观测数据验证了两种服务的定位性能。结果显示,目前两系统提供的精密单点定位服务均支持厘米级静态定位应用,PPP-B2b在轨道钟差精度、定位精度、收敛时间和服务范围上均稍逊于CLAS-E。CLAS-E播发的改正产品中GPS BLOCK IIF卫星受轨道机动影响,轨道误差会发生跳变。BDS-3仍然在发展建设当中,相信PPP-B2b的服务性能将会进一步提升。
文摘In this study,the effect of different sampling rates(i.e.observation recording interval)on the Precise Point Positioning(PPP)solutions in terms of accuracy was investigated.For this purpose,a field test was carried out inÇorum province,Turkey,on 11 September 2019.Within this context,a Geodetic Point(GP)was established and precisely coordinated.A static GNSS measurement was occupied on the GP for about 4-hour time at 0.10 second(s)/10 Hz measurement intervals with the Trimble R10 geodetic grade GNSS receiver.The original observation file was converted to RINEX format and then decimated into the different data sampling rates as 0.2 s,0.5 s,1 s,5 s,10 s,30 s,60 s,and 120 s.All these RINEX observation files were submitted to the Canadian Spatial Reference System-Precise Point Positioning(CSRS-PPP)online processing service the day after the data collection date by choosing both static and kinematic processing options.In this way,PPP-derived static coordinates,and the kinematic coordinates of each measurement epoch were calculated.The PPP-derived coordinates obtained from each decimated sampling intervals were compared to known coordinates of the GP for northing,easting,2D position,and height components.According to the static and kinematic processing results,high data sampling rates did not change the PPP solutions in terms of accuracy when compared to the results obtained using lower sampling rates.The results of this study imply that it was not necessary to collect GNSS data with high-rate intervals for many surveying projects requiring cm-level accuracy.
