Precise orbit determination for Jason-1 satellite using on-board GPS data with centimeter-level accuracy
As the on-board GPS has become one of the key POD approaches for LEO satellites and will be widely placed on the future LEO mission to support their orbit accuracy requirements, Shanghai Astronomical Observatory has developed the SHOEDEE-III procedure which may support zero-difference dynamic orbit determination as well as single-difference dynamic orbit determination using on-board GPS data by fixing GPS ephemeris and clock bias.
This would give support to scientific missions equipped with GPS receivers, and make its due contribution to the future oceanographic, climatic and remote sensing missions of our own country.
This study is reported in issue 54 (Jan. 2009) of the Chinese Science Bulletin.
In order to test the POD accuracy of SHORDE-III, Peng and Wu processed two cycles (Dec. 19, 2002 to Jan. 7, 2003) of the Jason-1 on-board GPS data, and assessed the orbits by comparing POE, orbit overlaps and independent SLR validations. These results show that: 1) there is no obvious systematic bias between POE and orbit solutions computed using the SHORDE-III procedure, the 3-D orbit difference RMS is about 5.71 cm, and the radial orbit RMS accuracy is about 1.71 cm; 2) the 3-D RMS of orbit overlaps is about 4.89 cm, and the radial RMS accuracy is about 1.45 cm; 3) no significant bias has been found for the SLR residuals. The 20-day statistic bias of the SLR residual with the 15-degree elevation cutoff is 0.07}3.69 cm, and the statistic bias of the 60-degree elevation cutoff is 0.49}1.61 cm.
The main conclusion reported by the authors is that the models, strategy, and procedure described in this study are viable for use in real-world situations, and provide highly accurate GPS-based solutions.
This study is supported by the National Natural Science Foundation of China (Grant No. 40274006), the National High-Tech R&D Program (863 Program) of China (2006AA12A107), and the Science & Technology Commission of Shanghai Municipality (06DZ22101).
Reference: Peng DongJu-WU Bin. Precise orbit determination for Jason-1 satellite using on-board GPS data with cm-level accuracy. Chinese Science BulletinC2009C54(2): 196-202
Dongju Peng | EurekAlert!
The most recent press releases about innovation >>>
Die letzten 5 Focus-News des innovations-reports im Überblick:
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...