Rapid and accurate ambiguity resolution is the core of high-precision precise point positioning (PPP) data processing. However, parameters in PPP observation models are easily affected by atmospheric residual gross errors, which lead to probability successfully fixing decreases computational burden increases full resolution. Therefore, an increasing number partial (PAR) strategies have been proposed. The selection optimal subset PAR crucial this method. traditional method commonly leads a...

Atmospheric pressure loading (APL) deformation is one component of nontectonic for Global Navigation Satellite System (GNSS) time series and a kind response caused by redistribution atmospheric pressure. In this paper, we present an data processing strategy to compute the APL based on spherical harmonic expansion global atmosphere changes. We also provide sample model describe relativity between changes vertical deformation. The results show that variation air mass has major impact...

<title>Abstract</title> Weighted mean temperature (Tm) serves as a crucial parameter in converting tropospheric zenith wet delay into precipitable water vapor global navigation satellite system meteorology. Different from the traditional strategy, this study developed new method of atmospheric Tm grid model construction with high precision and spatiotemporal resolution while taking account hourly near-surface air lapse rates (NSTLR). Core research contents include regional NSTLR estimation...

Since much of the current researches have focused on daily, monthly or annual near-surface (2 m) temperature lapse rate (NSTLR), there is little guidance best estimation practices and analyses time-varying characteristics for hourly NSTLR. To estimate NSTLR identify its accurately objectively, this study proposed a robust strategy based IGGIII equivalent weight using multiple linear regression models. The accuracy reliability method was verified. results show that can further improve...

Due to the difference in quality of global assimilation data and ability reproduce real conditions atmosphere, hourly atmospheric temperature at 2 m above land surface from ERA5 cannot be used with complete confidence for weighted mean (Tm) calculations navigation satellite system (GNSS) precipitable water vapor (PWV) inversion. A systematic refinement method is proposed, including compensation elevation matching bias gridded temperature, correction fixed-time cusp fitting based on...

High-precision DCBs are essential for effective multi-frequency and multi-constellation GNSS integration, especially in processing compatible signal observations. This study utilizes data from MGEX, iGMAS, CORS stations to estimate analyze long time series of BDS/GNSS DCBs, focusing on stability influencing factors. Results indicate that the same signal, but different channels exhibit similar ranges trends. Among BDS those satellites with rubidium atomic clocks more stable than hydrogen...

In this paper, a rank deficient adjustment model with inequality constrained is implemented to realise the conversion from single-difference (SD) wide lane fractional cycle bias (WL-FCB) undifferenced(UD) WL-FCB. The results are compared un-differential FCB published by Centre National d'Etudes Spatiales (CNES), and temporal variation characteristics of SD WL-FCB UD analysed. indicate that stability daily WL-FCB, whether it or UD, better than an hour. recovered using above approach CNES,...

The time-varying biases within carrier phase observations are integrated into satellite clock offset parameters for precise estimation. Consequently, when the bias is applied to third frequency observation point positioning (PPP), a new type of inter-frequency (IFCB) with dependence should be noticed. If IFCB estimated together receiver coordinates, tropospheric wet delay, ambiguity and other parameters, it will increase computational burden lead more time consumption. In order solve this...

In China, gas and oil reserves are very scarce, but coal resources abundant in the energy architecture, which decides that will remain dominant source for a long time future. The accurate prediction of size extent surface movement after seam mining is great significance safe promotion production activities mine area safety people’s lives properties area. deformation under thick loose conditions indicates phenomenon large subsidence value influence range. To predict range layer accurately,...