Hybrid Survey Networks: Combining Real-Time and Static GNSS Observations for Optimizing Height Modernization

2018 ◽  
Vol 144 (1) ◽  
pp. 05017006 ◽  
Author(s):  
Brian Weaver ◽  
Daniel T. Gillins ◽  
Michael Dennis
Keyword(s):  
Real Time ◽  
Gnss Observations

scholarly journals Weighting of Multi-GNSS Observations in Real-Time Precise Point Positioning

2018 ◽  
Vol 10 (2) ◽  
pp. 84 ◽  
Author(s):  
Kamil Kazmierski ◽  
Tomasz Hadas ◽  
Krzysztof Sośnica
Keyword(s):  
Real Time ◽  
Precise Point Positioning ◽  
Point Positioning ◽  
Gnss Observations

scholarly journals The Multipath Influence in Real-Time Kinematic of GNSS Observations at Different Antenna Heights

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Bakheet Agab Nour ◽  
Ahmet Turan Ozdemir ◽  
Peter Garang ◽  
Oğuzhan Ağırbaş
Keyword(s):  
Signal Processing ◽  
Real Time ◽  
Carrier Phase ◽  
Inverse Relationship ◽  
Antenna Design ◽  
Error Source ◽  
Multipath Error ◽  
Real Time Kinematic ◽  
Gnss Observations

Multipath is a dominant error source in Real-Time Kinematic (RTK) applications that reduces the position, time and velocity accuracy. Mitigation of such errors can be achieved by better signal processing and antenna design. This paper attempts to examine the different height of RTK system antenna with regards to the multipath error. The results obtained in this work show height significantly change of multipath in pseudo range (MP1) and multipath in the carrier phase (MP2). Different antenna height does not give the same multipath error result in the tests that we have conducted in this work. The optimal height of the antenna was achieved as two meters in order to obtain a minimum multipath error for   MP1 and MP2. At the end of this work, we experimentally proved that there is an inverse relationship between the height of the antenna and multipath with RTK algorithm.

scholarly journals Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M w  7.8 Nepal earthquake

2016 ◽  
Vol 43 (1) ◽  
pp. 161-167 ◽  
Author(s):  
Tao Geng ◽  
Xin Xie ◽  
Rongxin Fang ◽  
Xing Su ◽  
Qile Zhao ◽  
...  
Keyword(s):  
Real Time ◽  
Seismic Waves ◽  
High Rate ◽  
Nepal Earthquake ◽  
Gnss Observations

scholarly journals Tendencies of development of local geodetic network in Riga city

2018 ◽  
Vol 9 ◽  
pp. 8-15 ◽  
Author(s):  
Armands Celms ◽  
Velta Parsova ◽  
Ilona Reke ◽  
Janis Akmentins
Keyword(s):  
Real Time ◽  
Geodetic Network ◽  
Base Station ◽  
Base Stations ◽  
Reference Network ◽  
Station Network ◽  
One Year ◽  
The City ◽  
Gnss Observations ◽  
Made In

Local geodetic network is very important in harmonic development of city territory. On the base of the local geodetic network, cadastral and topographic surveying works, engineering geodetic works and executive measurements of newly built buildings and engineering networks are carried out. In the territory of Riga, the local geodetic network was started to create in 1880, and in the course of time, as the city expanded, necessity to have wider reference network emerged. In 2005, in the territory of Latvia, network of continuously working base stations LatPos was launched, which ensured completely new trends in execution of measurements and accuracy reached. One year later, base station network EUPOS-RIGA was launched in the territory of Riga. It can be regarded as consistent part of Riga local geodetic network. The purpose of the research was to state, what are differences between historically used coordinates of points of the local geodetic network, and coordinates that are determined by use of real time corrections of LatPos and EUPOS-RIGA base station network. Measurements were made in the territory of Riga in period from December 2016 until April 2017. In the framework of the research, 61 point of the local geodetic network was inspected and in 38 cases GNSS observations in RTK mode were completed. In the research, catalogues of coordinates of polygonometry points of sixties and eighties were used in order to compare what differences of coordinates existed historically. The main conclusion drawn during the research – historical points of the local geodetic network shall not be used for surveying works of any kind before improvement of them and before they comply with requirements of normative acts.

scholarly journals An assessment of the quality of near-real time GNSS observations as a potential data source for meteorology

2017 ◽  
Vol 5 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Natalia Dymarska ◽  
Witold Rohm ◽  
Jan Sierny ◽  
Jan Kapłon ◽  
Tomasz Kubik ◽  
...  
Keyword(s):  
Real Time ◽  
Data Source ◽  
Gnss Observations

scholarly journals Real-Time Tropospheric Delays Retrieved from Multi-GNSS Observations and IGS Real-Time Product Streams

2017 ◽  
Vol 9 (12) ◽  
pp. 1317 ◽  
Author(s):  
Cuixian Lu ◽  
Xinghan Chen ◽  
Gen Liu ◽  
Galina Dick ◽  
Jens Wickert ◽  
...  
Keyword(s):  
Real Time ◽  
Tropospheric Delays ◽  
Gnss Observations

Modeling and assessment of real-time precise point positioning timing with multi-GNSS observations

2020 ◽  
Vol 31 (6) ◽  
pp. 065016
Author(s):  
Yulong Ge ◽  
Shuo Ding ◽  
Peipei Dai ◽  
WeiJin Qin ◽  
Xuhai Yang
Keyword(s):  
Real Time ◽  
Precise Point Positioning ◽  
Point Positioning ◽  
Gnss Observations

Real-time estimation of multi-GNSS and multi-frequency integer recovery clock with undifferenced ambiguity resolution

2020 ◽  
Author(s):  
Yun Xiong ◽  
Yongqiang Yuan ◽  
Jiaqi Wu ◽  
Xin Li ◽  
Jiaxin Huang
Keyword(s):  
Real Time ◽  
Ambiguity Resolution ◽  
Computation Time ◽  
Time Estimation ◽  
Global Navigation Satellite Systems ◽  
Estimation Model ◽  
Processing Efficiency ◽  
Real Time Clock ◽  
Clock Estimation ◽  
Gnss Observations

<p>Precise clock product of global navigation satellite systems (GNSS) is an important prerequisite to support real-time precise positioning service. The developments of multi-constellation and multi-frequency GNSS open new requirements for real-time clock estimation. In this contribution, the estimation model of multi-GNSS and multi-frequency integer recovery clock (IRC) is developed to improve both the accuracy and efficiency of real-time clock estimates. In the proposed method, the undifferenced ambiguities are fixed to integers, thus the integer properties of the ambiguities are recovered and the accuracy of the clock estimates is also improved. Moreover, benefitting from the removal of large quantities of ambiguity parameters, the computation time is greatly reduced which can guarantee high processing efficiency of real-time clock estimates. Multi-GNSS observations from 150 globally distributed Multi-GNSS Experiment (MGEX) tracking stations were processed with the proposed model. Compared to the float satellite clocks, the precision of the real-time IRC with respect to CODE 30 s final multi-GNSS satellite clock products were improved by 53.0%, 42.7%, 63.7% and 33.9% for GPS, BDS, Galileo and GLONASS, respectively. The average computation time per epoch with multi-GNSS observations was improved by 97.1% compared to that of standard float clock estimation. Kinematic precise point positioning (PPP) ambiguity resolution was also performed with the derived real-time IRC products. Compared to the float PPP solutions, the position accuracy of the multi-GNSS IRC-based fixed solutions was improved by 77.2%, 49.7% and 52.7% from 24.2, 13.3 and 30.7 mm to 5.5, 6.7 and 14.5 mm for the east, north and up components, respectively. The results indicate that ambiguity fixing can be successfully achieved by using the derived the IRC products. In addition, the estimation model of multi-frequency IRC products is also investigated to promote the capability and application of real-time PPP AR under multi-frequency signals.</p>

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