Suspension Cable Bridge Deflection Determination Using Kinematic PPP with High-Rate GPS Satellite Clock Corrections

2020 ◽  
pp. 222-231
Author(s):  
Xu Tang ◽  
Fei Guo ◽  
Craig Matthew Hancock ◽  
Huib de Ligt
Keyword(s):  
High Rate ◽  
Satellite Clock ◽  
Suspension Cable ◽  
Kinematic Ppp

scholarly journals A Decentralized Processing Schema for Efficient and Robust Real-time Multi-GNSS Satellite Clock Estimation

2019 ◽  
Vol 11 (21) ◽  
pp. 2595
Author(s):  
Jiang ◽  
Gu ◽  
Li ◽  
Ge ◽  
Schuh
Keyword(s):  
Real Time ◽  
High Frequency ◽  
Precise Point Positioning ◽  
High Rate ◽  
Reference Network ◽  
Satellite Clock ◽  
Navigation Data ◽  
Data Analyst ◽  
New Strategy ◽  
Clock Estimation

Real-time multi-GNSS precise point positioning (PPP) requires the support of high-rate satellite clock corrections. Due to the large number of ambiguity parameters, it is difficult to update clocks at high frequency in real-time for a large reference network. With the increasing number of satellites of multi-GNSS constellations and the number of stations, real-time high-rate clock estimation becomes a big challenge. In this contribution, we propose a decentralized clock estimation (DECE) strategy, in which both undifferenced (UD) and epoch-differenced (ED) mode are implemented but run separately in different computers, and their output clocks are combined in another process to generate a unique product. While redundant UD and/or ED processing lines can be run in offsite computers to improve the robustness, processing lines for different networks can also be included to improve the clock quality. The new strategy is realized based on the Position and Navigation Data Analyst (PANDA) software package and is experimentally validated with about 110 real-time stations for clock estimation by comparison of the estimated clocks and the PPP performance applying estimated clocks. The results of the real-time PPP experiment using 12 global stations show that with the greatly improved computational efficiency, 3.14 cm in horizontal and 5.51 cm in vertical can be achieved using the estimated DECE clock.

scholarly journals Efficient High-Rate Satellite Clock Estimation for PPP Ambiguity Resolution Using Carrier-Ranges

Sensors ◽  
2014 ◽  
Vol 14 (12) ◽  
pp. 22300-22312 ◽  
Author(s):  
Hua Chen ◽  
Weiping Jiang ◽  
Maorong Ge ◽  
Jens Wickert ◽  
Harald Schuh
Keyword(s):  
Ambiguity Resolution ◽  
High Rate ◽  
Satellite Clock ◽  
Clock Estimation

scholarly journals BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections

Sensors ◽  
2016 ◽  
Vol 16 (12) ◽  
pp. 2192 ◽  
Author(s):  
Tao Geng ◽  
Xing Su ◽  
Rongxin Fang ◽  
Xin Xie ◽  
Qile Zhao ◽  
...  
Keyword(s):  
Precise Point Positioning ◽  
High Rate ◽  
Satellite Clock ◽  
Point Positioning ◽  
Seismic Displacements

Satellite clock estimation at 1 Hz for realtime kinematic PPP applications

GPS Solutions ◽  
2010 ◽  
Vol 15 (4) ◽  
pp. 315-324 ◽  
Author(s):  
Xiaohong Zhang ◽  
XingXing Li ◽  
Fei Guo
Keyword(s):  
Satellite Clock ◽  
Clock Estimation ◽  
Kinematic Ppp

Real-time estimation of BDS/GPS high-rate satellite clock offsets using sequential least squares

2018 ◽  
Vol 62 (2) ◽  
pp. 477-487 ◽  
Author(s):  
Wenju Fu ◽  
Yuanxi Yang ◽  
Qin Zhang ◽  
Guanwen Huang
Keyword(s):  
Least Squares ◽  
Real Time ◽  
Time Estimation ◽  
High Rate ◽  
Satellite Clock ◽  
Real Time Estimation

A computationally efficient approach for estimating high-rate satellite clock corrections in realtime

GPS Solutions ◽  
2011 ◽  
Vol 16 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Maorong Ge ◽  
Junping Chen ◽  
Jan Douša ◽  
Gerd Gendt ◽  
Jens Wickert
Keyword(s):  
High Rate ◽  
Computationally Efficient ◽  
Satellite Clock ◽  
Efficient Approach

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Rapid Freezing of Freeze-Etch Specimens

1980 ◽  
Vol 38 ◽  
pp. 752-755
Author(s):  
A. Elgsaeter ◽  
T. Espevik ◽  
G. Kopstad
Keyword(s):  
Low Temperature ◽  
Metal Surface ◽  
Relative Velocity ◽  
Thermal Contact ◽  
High Rate ◽  
Rapid Freezing ◽  
Temperature Decrease ◽  
Freeze Etching

The importance of a high rate of temperature decrease (“rapid freezing”) when freezing specimens for freeze-etching has long been recognized1. The two basic methods for achieving rapid freezing are: 1) dropping the specimen onto a metal surface at low temperature, 2) bringing the specimen instantaneously into thermal contact with a liquid at low temperature and subsequently maintaining a high relative velocity between the liquid and the specimen. Over the last couple of years the first method has received strong renewed interest, particularily as the result of a series of important studies by Heuser and coworkers 2,3. In this paper we will compare these two freezing methods theoretically and experimentally.

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