Precision Evaluation and Consistency Analysis of iGMAS Orbit and Clock Products
This paper evaluates the precision of iGMAS orbit and clock products, and analyzes their consistency. By the methods of orbit comparisons and day boundary discontinuities (DBDs), the iGMAS orbit precision is evaluated. The twice difference method is used
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Abstract This paper evaluates the precision of iGMAS orbit and clock products, and analyzes their consistency. By the methods of orbit comparisons and day boundary discontinuities (DBDs), the iGMAS orbit precision is evaluated. The twice difference method is used to evaluate clock precision. On the basis of precision analysis, consistency of orbit and clock products from different analysis centers (AC) was compared by precise point positioning (PPP) technique. The quality of orbit, clock, and GNSS observation would have a large impact on the accuracy of PPP. Therefore, the experimental data for consistency analysis includes MGEX station observation data with good quality, and the orbit/clock products with comparable precision. Using the proposed method, precision, and consistency of iGMAS orbit and clock products from different AC are analyzed.
Keywords iGMAS Orbit and clock product point position BDS
Precision evaluation Precise
1 Introduction The international GNSS Monitoring and Assessment System (iGMAS) is the world’s continuous monitoring and evaluation system sponsored by China in the international area. iGMAS aims to establish a global distribution network of GNSS signal tracking to provide service to global customers, which can monitor service S. Yu (&) School of Geology Engineering and Surveying, Chang’an University, Xi’an, Shanxi, China e-mail: [email protected] T. Xu (&) State Key Laboratory of Geo-Information Engineering, Xi’an, Shanxi, China e-mail: [email protected] T. Xu Xian Research Institute of Surveying and Mapping, Xi’an, Shanxi, China © Springer Science+Business Media Singapore 2016 J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2016 Proceedings: Volume III, Lecture Notes in Electrical Engineering 390, DOI 10.1007/978-981-10-0940-2_16
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performance and signal quality of GNSS. GNSS users via the Internet can not only obtain monitoring and assessment service information for each GNSS system, but also get high precision products. Similar to IGS, iGMAS products include Multi-GNSS precise orbit and clock products, iGMAS station coordinates and velocities, earth rotation parameters (ERP), geocentric motion, troposphere and ionosphere products. Precision and consistency of these products are very important for users to carry out high precision navigation and positioning [1, 2]. This paper focuses on precision evaluation and consistency analysis of iGMAS orbit and clock products.
2 Precision Evaluation of iGMAS Orbit and Clock Products 2.1
Orbit Products
In order to assess the orbit precision of iGMAS integration and service center (ISC) and analysis centers (ACs), the following two methods are proposed. 1. Orbit comparison. This approach compares the positions of different orbit products [3, 4]. For GPS system, IGS final product accuracy is regarded as the highest. It can be used to assess GPS orbits precision of iGMAS ACs and ISC by mean RMS of orbit comparison. 2. Day boundary discontinues(DBDS) [4, 5]. This method is developed by Griffiths and
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