Comprehensive Assessment of BDS-2 and BDS-3 Precise Orbits Based on B1I/B3I and B1C/B2a Frequencies from iGMAS

The BeiDou Global Navigation Satellite System (BDS), including the second generation (BDS-2) and third (BDS-3), has been widely used in areas of positioning, navigation, timing (PNT). One essential prerequisites for accurate PNT service is precise satellite orbits multi-frequency multi-constellation BDS-2 BDS-3 satellites. As usual, orbit products can be obtained from analysis centers (ACs) international GNSS Service (IGS). also downloaded Monitoring Assessment (iGMAS). Compared with IGS ACs, iGMAS provide featured services such as based on new B1C/B2a BDS signals. Considering indispensability signals, performance all needs to known. However, there no comprehensive assessment B1I/B3II frequencies iGMAS, especially period after entered stable operation stage. In this paper, BDS-2/BDS-3 final (ISC), rapid (ISR), ultra-rapid (ISU) B1I/B3I are assessed comprehensively. Specifically, at first, compared ones ACs. Based this, laser ranging inspects iGMAS. Finally, errors discussed systematically by considering beta elongation angles. Using one year data, accuracy geostationary orbit, inclined geosynchronous medium earth (MEO) satellites almost reach meter decimeter level, sub-decimeter centimeter respectively, where ISC best. ISC, ISR, ISU generally better than frequencies. Additionally, according SLR results show that BDS-2. mean values biases MEO approximately 2.88 cm. addition, related angle some extent, manufacturers may have an influence errors.