20 Result(s)
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Chapter and Conference Paper
Scintillation Identification Based on Spectral Features
Performance of machine learning (ML) methods to identify scintillation events is analyzed for a variety of scenarios. It shows that spectrum embodies various features on scintillation variation. Different meth...
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Chapter and Conference Paper
An Ionospheric Disturbance Index for SBAS Based on Gradient Variation
A simply constructed index is generally wanted to give direct indication of ionospheric status for Space-based augmentation system (SBAS) users. To this end, we make extensive analysis of ionospheric grid mode...
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Chapter and Conference Paper
Validation of Relationship Between ROTI and S4 with Array of GNSS Measurements
With phase structure function, a theory model could be constructed to describe the rate of total electron content index (ROTI) and its relationship with amplitude scintillation index
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Chapter and Conference Paper
Analysis of Ionospheric Grid Model Performance for China Area
Special characteristics of regional ionosphere generally impact the grid model of SBAS most seriously. Performance of grid model is analyzed for stormy ionosphere conditions with GNSS data in the year of 2011–...
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Chapter and Conference Paper
The Design of Low-Power and High-Precision Electronic Scale Based on Single Chip
This paper introduces the design and fabrication of a low-power and high-precision electronic scale with resistance strain gauge as the weight sensor. According to the demand of commercial measurement, the pap...
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Chapter and Conference Paper
Modeling of BDS Positioning Errors Due to Ionospheric Scintillation and Its Application
In this work, efforts are made to develop models of BDS positioning errors due to ionospheric scintillation. Two aspects are specially considered in the modeling work, namely the lose-of-lock on signals and th...
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Chapter and Conference Paper
Analysis and Modeling on Interference of Solar Radio Burst on GNSS Signal
When the GNSS signal is overshadowed by the wide-range radio noise incited by a solar burst event, a potential interference would happen. Theoretical analysis shows the solar radio burst could impact GNSS sign...
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Chapter and Conference Paper
Analysis on Characteristics of Delay Errors Under Ionospheric Anomaly in China Area
Ionospheric anomaly in south of China will degrade the performance of SBAS grid models severely. Characteristics of ionospheric delay errors are analyzed with observations from the mid and low latitudes area i...
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Chapter and Conference Paper
Matrix Reconstruction-Based Algorithm for Two-Dimensional Coherent DOA Estimation
In this paper, an effective matrix reconstruction-based two-dimensional (2-D) direction-of-arrival (DOA) estimation algorithm is addressed. In the proposed algorithm, the coherency of incident signals is decor...
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Chapter and Conference Paper
Novel Cumulants-Based Decoherent Method for 2-D DOA Estimation
A novel decoherence algorithm, called fourth-order cumulants-based improved Toeplitz matrices reconstruction (FOC-ITMR) method is presented to estimate two-dimensional (2-D) direction-of-arrival (DOA) of coher...
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Chapter and Conference Paper
Application of Gaussian Overbounding on Ionospheric Error Analysis for China SBAS
Delay errors will follow a biased distribution under the ionospheric anomaly or storms conditions, making it difficult to overbound effectively the delay errors with the estimated error bounds for SBAS. Gaussi...
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Article
Open AccessEfficient method of two-dimensional DOA estimation for coherent signals
An effective decoherence method called the fourth-order cumulants-based improved Toeplitz matrices reconstruction (FOC-ITMR) is addressed for two-dimensional (2-D) direction-of-arrival (DOA) estimation of cohe...
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Chapter and Conference Paper
A Study on Construction of Ionospheric Spatial Threat Model for China SBAS
Finite sampling of the ionosphere from the limited number of observations will threat the integrity of SBAS (Space-Based Augmentation System). Ionospheric spatial threat model is introduced to over-bound resid...
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Chapter and Conference Paper
Scintillation Modeling and Its Application in GNSS
A method to analysis GNSS effects flexibly under various scintillation conditions is presented with a combination of irregularity strength modeling and signal propagating model. Irregularity strength model des...
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Chapter and Conference Paper
Analysis on Ionospheric Delay Variogram Modeling in China
Ionospheric delay variogram is essential for Kriging based Space-Based Augmentation System (SBAS) ionospheric grid model. Variogram realizations are compared for various solar activity conditions and different...
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Chapter and Conference Paper
Irregularities Detection and Bounding Variance Estimation in Ionospheric Grid Model
The ways to detect ionospheric irregularities effects and construct a more effective bounding variance under ionospheric disturbance are presented in the paper. Ionospheric grid model is constructed to estimat...
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Chapter and Conference Paper
Ionospheric Threat Model Methodology for China Area
The ionosphere is the largest remaining error source affecting GNSS regional augmentation system. The situation could be more serious when there is no enough measurement in a limited areas monitored by the net...
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Chapter and Conference Paper
An Improved GNSS Global Ionospheric Model
GNSS ionospheric correction models for single frequency user are realized through the combination of the information of long term variation from available background ionospheric model and the real-time informa...
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Chapter and Conference Paper
Ionospheric Spatial Correlation Analysis for China Area
Ionospheric correlation models are needed for ionospheric grid-based augmentation system development and its rigorous integrity performance requirement. 0th and 1st order ionospheric correlation function was e...
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Chapter and Conference Paper
A Study of Ionospheric Scintillation Effects on Differential GNSS
Irregularly structured ionospheric regions can cause diffraction and scattering of trans-ionospheric GNSS signals. When received at an antenna, these signals present random temporal fluctuations in both amplit...
