In 2020, BDS-3 began broadcasting high-precision positioning correction products through B2b signals, effectively addressing the limitations of ground-based augmentation. However, challenges such as “south wall effect” from geostationary orbit (GEO) satellites, issues data (IOD) mismatch, and signal priority conflicts often result in interruptions anomalies during real-time with service. This paper proposes a continuous B2b-PPP (B2b signal-based Precise Point Positioning) model that...

Real-time dynamic displacement and spectral response on the midspan of Jiangyin Bridge were calculated using Global Navigation Satellite System (GNSS) a speedometer for purpose understanding behavior temporal evolution bridge structure. Considering that GNSS measurement noise is large velocity/acceleration sensors cannot measure low-frequency displacement, Variational Mode Decomposition (VMD) algorithm was used to extract GNSS. Then, extracted from time series high-frequency vibration by...

To improve smartphone GNSS positioning performance using extra inequality information, an constraint method was introduced and verified in this study. Firstly, the model reviewed three applications were derived from it, namely, vertical velocity, direction, distance constraints. Secondly, we estimator based on density function truncation to solve problem. Finally, of investigated datasets smartphones, including a Huawei P30, P40, Xiaomi MI8. The results indicate that position velocity...

For long baseline in a network, the traditional combined ionosphere-free (IF) + wide-lane (WL) strategy is commonly used, but residual tropospheric delays and larger noise hamper basic ambiguity resolution (AR). With completion of BeiDou global navigation satellite system (BDS-3) quad-frequency signals provided by BDS-3 satellites, we can construct more combinations that are conducive to resolution. Compared with linear combinations, estimated ionospheric delay using three independent WL...

With the rise of location services applications, need for navigation and positioning extends from isolated environments to a seamless, full domain. Aiming at problem low accuracy in transition area between indoor outdoor, it is difficult achieve smooth switching, this article proposes an outdoor seamless system smartphones based on environment perception. Firstly, hidden Markov model (HMM), we use smartphone observation data select optimal features construct environmental perception model....

An inter-system model for multi-GNSSs (global navigation satellite systems) makes the interoperability among different GNSS constellations possible. In recent years, models geodetic receivers have been extensively studied. However, precise positioning of smartphones suffers from various problems, and current research mostly focuses on how to achieve ambiguity resolution. Based receiver channel-dependent bias, in this study, we will temporal behaviors differential bias (DISB) implement an...

In vehicle navigation scenarios, the RTK positioning results of smartphones are prone to jumps due interference complex urban environments, and heading angle dead reckoning (DR) is divergence. order obtain more stable high-precision smartphone results, this paper proposes an RTK/DR method combined with OpenStreetMap road network. The network data used correct during linear motion phase improve accuracy. reduce impact jumping on subsequent DR, it possible set up a measurement update switch,...

As one of the main errors that affects Global Navigation Satellite System (GNSS) positioning accuracy, ionospheric delay also improvement smartphone accuracy. The current error correction model used in smartphones has a certain time and low which is difficult to meet needs real-time smartphones. This article proposes method use regional retrieved from Continuously Operating Reference Stations (CORS) observation data correct GNSS smartphone. To verify accuracy model, using posterior grid as...

Abstract When calibrating inter-system biases (ISB), especially the fractional part of phase (F-ISPB), a multi-GNSS model can effectively improve positioning performance under complex environment. Usually, F-ISPB is estimated after fixing intra-system ambiguities. However, this approach seems inapplicable when it difficult to obtain ambiguities A multi-dimensional particle filter (PF)-based estimate method has been proposed overcome problem. Nevertheless, PF involves great quantity...

In the process of composing a double-differenced positioning model, it is difficult to separate different frequency signals between code division multiple access (CDMA) systems, single-difference ambiguity pivot satellite and phase differential inter-system biases (PDISBs). Hence calibrate in advance bias systems order build an model which only needs one satellite. Based on analysis stability PDISB parameters for non-overlapping CDMA this study adopts particle filter estimate fractional part...

Abstract By calibrating the inter-system bias (ISB), an model can be achieved to improve performance of multi-global navigation satellite system (GNSS) positioning. A number studies were carried out compose models among code division multiple access (CDMA) systems. However, due frequency (FDMA) technique, GLONASS phase and observations suffer from inter-frequency (IFPB) (IFCB) respectively, which make it difficult obtain ISB CDMA In addition, most current are unable handle mixed frequencies....

A multipath is a major error source in bridge deformation monitoring and the key to achieving millimeter-level monitoring. Although traditional MHM (multipath hemispherical map) algorithm can be applied mitigation real-time scenarios, accuracy needs further improved due influence of observation noise differences between different satellites. Aiming at insufficiency dealing with adverse impact noise, we proposed MHM_V model, based on Variational Mode Decomposition (VMD) algorithm. Utilizing...

The BeiDou Global Navigation Satellite System (BDS-3) provides real-time precise point positioning (PPP) service via B2b signals, offering decimeter-level for users in China and surrounding areas. However, common interruptions outliers PPP-B2b services arise due to factors such as the Geostationary Orbit (GEO) satellite “south wall effect”, Issue of Data (IOD) matching errors, signal broadcast priorities, posing challenges continuous high-precision positioning. This study meticulously...

Inter-system code double differencing is an effective method for improving the positioning accuracy of low-cost receivers in complex environments. Due to adoption Frequency Division Multiple Access (FDMA), Globalnaya Navigazionnaya Sputnikovaya Sistema (GLONASS) observations are affected by Inter-Frequency Code Biases (IFCBs), which makes it difficult calculate Differential Inter-System (DISCBs) between GLONASS and (CDMA) systems directly. In this contribution, focus on performance tightly...

The tight combination model improves the positioning accuracy of Global Navigation Satellite System (GNSS) in complex environments by increasing redundancy observation. However, ambiguity cannot be calculated directly because correlation between it and phase difference inter-system bias (DISB) model. This paper proposes a method DISB estimation based on principle maximum ratio. From data analysis, for standard deviation code DISB, improvement can up to 0·179 m with poor quality data. In...

Abstract It has been acknowledged that the Doppler is beneficial to GNSS positioning of smartphones. However, analysis precision on smartphones insufficient. In this paper, we focus characteristic raw measurement from Android A comprehensive investigation was conducted. The results illustrate availability stable and higher than carrier measurements, which means Doppler-smoothed code (DSC) method more effective. there a constant bias between rate in Xiaomi MI8, indicates extra processing DSC...

The existing vehicle safe driving warning system has some problems, such as limited sight distance, high implementation cost, complex technology, and so on. Aiming at these this paper develops a early based on smartphone high-precision positioning. can obtain positioning data through mobile RTK (real-time kinematic) real-time solution, determine the lane position of each vehicle, release information in real time whole road network cloud platform. Through test accuracy self-developed program,...