-
Article
Alternative formulae for robust Weighted Total Least-Squares solutions for Errors-In-Variables models
Weighted Total Least-Squares (WTLS) can optimally solve the issue of parameter estimation in the Errors-In-Variables (EIV) model; however, this method is relatively sensitive to outliers that may exist in the ...
-
Article
The BAB algorithm for computing the total least trimmed squares estimator
Robust estimation in the errors-in-variables (EIV) model remains a difficult problem because of the leverage point and the masking effect and swam** effect. In this contribution, a new robust estimator is in...
-
Article
Open AccessUncombined precise orbit and clock determination of GPS and BDS-3
There is increasing concern about the uncombined (UC) observation model in the field of global navigation satellite system (GNSS). Based on the global positioning system (GPS) and the third-generation BeiDou n...
-
Chapter and Conference Paper
Influence Analysis of Multi-LEO Augmentation MEO Satellite Orbit Determination Under Regional Station Layout
Since the ground monitoring stations layout for BeiDou navigation satellite system (BDS) is regional, the problem of bad orbit precision of BDS satellites needs to be resolved. Many scholars propose to use the...
-
Chapter and Conference Paper
A New Ambiguity Resolution Method Applied to Uncombined Precise Orbit Determination
With the continuous refinement of multi-GNSS and multi-frequency data processing, there is an increasing interest for the observation model based on uncombined (UC) strategy. Ambiguity resolution is an import...
-
Article
Variance-covariance component estimation for structured errors-in-variables models with cross-covariances
In this contribution, an iterative algorithm for variance-covariance component estimation based on the structured errors-in-variables (EIV) model is proposed. We introduce the variable projection principle and...
-
Article
Computationally efficient dual-frequency uncombined precise orbit determination based on IGS clock datum
Using uncombined (UC) or undifferenced original observations has become a research topic in the global navigation satellite system (GNSS) community. This far, precise orbit determination (POD) with ionospheric...
-
Article
Analysis of Galileo/BDS/GPS signals and RTK performance
New satellites and signals become available with the modernization of GNSS, especially for Galileo and BDS. The current Galileo constellation comprises 4 IOV (in-orbit validation) and 14 FOC (full operational ...
-
Article
Estimating and assessing Galileo satellite fractional cycle bias for PPP ambiguity resolution
Due to the rapid deployment of the Galileo constellation, Galileo is now able to contribute to GNSS precise point positioning (PPP) ambiguity resolution (AR) with 17 operational satellites as of December 2017....
-
Article
Estimating satellite phase fractional cycle biases based on Kalman filter
Phase fractional cycle biases (FCBs) originating from satellites and receivers destroy the integer nature of PPP carrier phase ambiguities. To achieve integer ambiguity resolution of PPP, FCBs of satellites ar...
-
Article
Real-time triple-frequency cycle slip detection and repair method under ionospheric disturbance validated with BDS data
In order to resolve the real-time cycle slip detection and repair problem with the data under ionospheric disturbance and low sample rate, a new method is proposed by using triple-frequency combinations. First...
-
Chapter and Conference Paper
Improved TCAR Algorithm for BDS Over Medium-Long Baseline
In the paper, a modified TCAR method was proposed to investigate triple-frequency ambiguity resolution (AR) performance with real BDS data. At first, the extra-wide-lane (EWL), wide-lane (WL) and narrow-lane (...
-
Chapter and Conference Paper
INS-Aided Single-Frequency Cycle-Slip Detection for Real-Time Kinematic GNSS
GNSS ambiguity fixed solution can greatly improve the accuracy of GNSS/INS integrated system. But it is difficult to achieve perfect real-time dynamic single frequency cycle-slip detection merely by GNSS obser...
-
Article
Improved time-differenced cycle slip detect and repair for GNSS undifferenced observations
GNSS undifferenced signal processing, in which the individual signal of each frequency is treated as independent observable, has drawn increasing interest in GNSS community. However, undifferenced signal proce...
-
Chapter and Conference Paper
The Research on Nonlinear Attitude Determination Method of GNSS Multi-antenna Attitude Measurement
GNSS multiple antenna attitude measurement possesses three attitude determination methods, direct solution, nonlinear least squares method and linear least squares method. Normal nonlinear least squares method...
-
Chapter and Conference Paper
Gaussian Mixture Filter Based on Variational Bayesian Learning in PPP/SINS
Aiming at the problem of inaccurate estimation of parameters and noise covariance for the noise mixture model encountered when using Gaussian filter during operation of PPP/SINS integrated navigation system in...
-
Chapter and Conference Paper
Refining of BDS Differential Code Bias Model
The differential code bias (DCB) in Global Navigation Satellite System (GNSS) satellites should be precisely determined using real ground GNSS data when designing certain applications, such as precise position...
-
Chapter and Conference Paper
Unscented Kalman Filter Algorithm with Colored Noise and Its Application in Spacecraft Attitude Estimation
The accuracy and reliability of the estimation and prediction of satellite attitude are affected by not only the random noise and systematic errors, but also the colored noise related to time. Any theory or te...
-
Chapter and Conference Paper
EMD De-Noising Theory Considering Static and Dynamic Conditions and Its Applications in INS
De-noising IMU data is an important approach to improve the accuracy of INS. Wavelet threshold de-noising has many limitations under certain conditions, especially in processing inertial sensor errors. Based o...
-
Chapter and Conference Paper
An Improved Algorithm for Single Point Positioning of COMPASS
The BeiDou (COMPASS) Navigation Satellite System has been able to provide service for areas in China and its surrounding areas. However, due to the limited number of satellites and the low accuracy, its applic...
