Correction method for the observed global navigation satellite system ultra-rapid orbit based on dilution of precision values

Wang, Q, Hu, C and Mao, Y 2018, 'Correction method for the observed global navigation satellite system ultra-rapid orbit based on dilution of precision values', Sensors, vol. 18, no. 11, pp. 1-17.


Document type: Journal Article
Collection: Journal Articles

Title Correction method for the observed global navigation satellite system ultra-rapid orbit based on dilution of precision values
Author(s) Wang, Q
Hu, C
Mao, Y
Year 2018
Journal name Sensors
Volume number 18
Issue number 11
Start page 1
End page 17
Total pages 17
Publisher MDPIAG
Abstract For ultra-rapid orbits provided by the Global Navigation Satellite System (GNSS), the key parameters, accuracy and timeliness, must be taken into consideration in real-time and near real-time applications. However, insufficient observations in later epochs appear to generate low accuracy in observed orbits, for which a correlation between the Dilution of Precision (DOP) of the orbit parameters and their accuracy is found. To correct the observed GNSS ultra-rapid orbit, a correction method based on the DOP values is proposed by building the function models between DOP values and the orbit accuracy. With 10-day orbit determination experiments, the results show that the observed ultra-rapid-orbit errors, generated by insufficient observations, can be corrected by 12�22% for the last three hours of the observed orbits. Moreover, considering the timeliness constraints in ultra-rapid-orbit determination, a DOP amplification factor is defined to weight the contribution of each tracking station and optimize the station distribution in the orbit determination procedure. Finally, six schemes are designed to verify the method and strategy in determining the ultra-rapid orbit based on one-month observations. The orbit accuracy is found to decrease by 1.27�6.34 cm with increasing amplification factor from 5�20%. Thus, the observed ultra-orbit correction method proposed is ideal when considering accuracy and timeliness in ultra-rapid orbit determination.
Subject Analytical Chemistry not elsewhere classified
Keyword(s) Amplification factor
Dilution of precision
Observed ultra-rapid orbit
Orbit correction
Orbit determination
DOI - identifier 10.3390/s18113900
Copyright notice © 2018 by the authors. Licensee MDPI, Basel, Switzerland. Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 1424-8220
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