The CODE ambiguity-fixed clock and phase bias analysis products: generation, properties, and performance

• DOI: 10.1007/s00190-021-01521-9
• Publication Date: 2021-06-28T17:02:28Z
• Authors: S. Schaer; A. Villiger; D. Arnold; R. Dach; L. Prange; A. Jäggi
• Keywords: Pseudorange; Precise Point Positioning; Ambiguity Resolution; Galileo (satellite navigation); Code (set theory); GNSS augmentation

Abstract The generation and use of GNSS analysis products that allow—particularly for the needs single-receiver applications—precise point positioning with ambiguity resolution (PPP-AR) are becoming more popular. A general uncertainty concerns question on how necessary phase bias information should be provided to PPP-AR user. Until now, each AR-enabling clock/bias representation method had its own practice provide information. We have generalized observable-specific signal (OSB) representation, as introduced in Villiger (J Geod 93:1487–1500, 2019) originally exclusively pseudorange measurements, carrier measurements. existing common clock (CC) approach has been extended a way OSBs allowing flexible frequency handling between multiple become possible. Advantages proposed OSB-based are: biases can consistent code measurements it is capable multi-GNSS suitable standardization. This new, implemented by Center Orbit Determination Europe (CODE). CODE adhere integer-cycle property submitted International Service (IGS) since mid 2018 three lines: Rapid, Final, MGEX (Multi-GNSS Extension). Ambiguity fixing performed not only GPS but also Galileo. between-satellite differences fundamental importance when comparing satellite estimates among various lines, or at day boundaries. Both kinds comparisons could exploited very high level consistency. Any retrieved comparison essentially indicated standard deviation clocks from order 5 ps (1.5 mm range). Finally, may recovered Final accompanying product consecutive daily sessions (using additionally second midnight epoch) allows us deduce continuous respect observation data over two, three, or, principle, yet days. Phase-based densification initially estimated integer-cycle-conform corrections intervals 300 s 30 (5 case our product) matter particular interest. Based direct GRACE K-band ranging (KBR) analysis, quality accordingly densified confirmed similar “anchor” (300 s) corrections.