The Journal of Global Positioning Systems

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Performance analysis of GNSS multipath mitigation using antenna arrays
The Journal of Global Positioning Systems - Tập 14 - Trang 1-15 - 2016
Niranjana Vagle, Ali Broumandan, Ali Jafarnia-Jahromi, Gérard Lachapelle
Multipath affects the shape of the correlation function and results in biased pseudorange measurements and erroneous navigation solutions. Antenna array processing, which uses signal spatial characteristics, is an effective method to mitigate various types of interference signals. However, the performance of most of the distortionless beamforming techniques degrades in multipath conditions due to ...... hiện toàn bộ
A posteriori estimation of stochastic model for multi-sensor integrated inertial kinematic positioning and navigation on basis of variance component estimation
The Journal of Global Positioning Systems - Tập 14 - Trang 1-12 - 2016
Kun Qian, Jianguo Wang, Baoxin Hu
Improving a priori stochastic models of the process and measurement noise vectors in Kalman Filer (KF) has always been a challenge. As one preferable technique to address this challenge, the variance component estimation (VCE) applied on the Kalman Filter’s process and measurement noise covariance matrix (Q & R) has been proved in plenty of applications. Unsurprisingly, VCE was expected to re-esta...... hiện toàn bộ
Camera auto-calibration in GPS/INS/stereo camera integrated kinematic positioning and navigation system
The Journal of Global Positioning Systems - Tập 14 - Trang 1-15 - 2016
Nilesh S. Gopaul, Jianguo Wang, Baoxin Hu
This paper presents a novel two-step camera calibration method in a GPS/INS/Stereo Camera multi-sensor kinematic positioning and navigation system. A camera auto-calibration is first performed to obtain for lens distortion parameters, up-to-scale baseline length and the relative orientation between the stereo cameras. Then, the system calibration is introduced to recover the camera lever-arms, and...... hiện toàn bộ
Review of triple-frequency GNSS: ambiguity resolution, benefits and challenges
The Journal of Global Positioning Systems - Tập 16 - Trang 1-11 - 2018
Bofeng Li
Triple-frequency GNSS has been intensively studying in the past decades, especially with the open service of China’s BeiDou system. In this review, we will address the ambiguity resolution, benefits gained from additional frequency signals compared to the dual-frequency GNSS signals, as well as analyse the challenges of triple-frequency GNSS for future development. We first review and compare the ...... hiện toàn bộ
Adaptive cubature Kalman filter based on the variance-covariance components estimation
The Journal of Global Positioning Systems - Tập 15 - Trang 1-9 - 2017
Ya Zhang, Jianguo Wang, Qian Sun, Wei Gao
Although the Kalman filter (KF) is widely used in practice, its estimated results are optimal only when the system model is linear and the noise characteristics of the system are already exactly known. However, it is extremely difficult to satisfy such requirement since the uncertainty caused by the inertial instrument and the external environment, for instance, in the aided inertial navigation. I...... hiện toàn bộ
Regional ionospheric modeling using wavelet network model
The Journal of Global Positioning Systems - Tập 15 - Trang 1-10 - 2017
Mohammed El-Diasty
A major error component of Global Positioning System (GPS) is the ionospheric delay. Ionopspheric error can be reduced by a dual frequency receiver using a linear combination technique that can not be applied with a single frequecy receiver. However, an accurate ionospheric error modeling for single-frequency receiver is required. Due to the nonlinearity of the ionospheric error, a highly nonlinea...... hiện toàn bộ
Evaluation of fingerprinting-based WiFi indoor localization coexisted with Bluetooth
The Journal of Global Positioning Systems - - 2017
Ling Pei, Jingbin Liu, Yuwei Chen, Ruizhi Chen, Liang Chen
WiFi and Bluetooth are two most commonly used short range wireless communication technologies. Recent years, with increasing number of WiFi and Bluetooth mobile terminals, tags, and other devices, a demand for integration and coexistence of these two technologies including their positioning function is booming. In this paper, we firstly investigate the interferences between WiFi and Bluetooth sign...... hiện toàn bộ
Regional Ionosphere Mapping with Kriging and Multiquadric Methods
The Journal of Global Positioning Systems - Tập 2 Số 1 - Trang 48-55 - 2003
Paweł Wielgosz, Dorota A. Grejner‐Brzezinska, Israel Kashani
An assessment of the interoperability of PPP-AR network products
The Journal of Global Positioning Systems - Tập 15 - Trang 1-12 - 2017
Garrett Seepersad, Sunil Bisnath
Integer ambiguity resolution of carrier-phase measurements from a single receiver can be implemented by applying additional satellite corrections (products) to mitigate unmodelled satellite equipment delays. Interoperability of different PPP-AR products would allow the PPP user to transform independently generated PPP-AR products to obtain multiple fixed solutions of comparable precision and accur...... hiện toàn bộ
A hybrid error modeling for MEMS IMU in integrated GPS/INS navigation system
The Journal of Global Positioning Systems - Tập 16 - Trang 1-12 - 2018
Maged Ismail, Ezzeldin Abdelkawy
Continuity of accurate navigational data for intelligent transportation applications has been widely provided by utilizing low-cost navigation systems through integrating GPS with micro-electro-mechanical-system (MEMS) inertial sensors. To achieve the required accuracy, augmentation of Kalman filter (KF) with nonlinear error modeling techniques such as fast orthogonal search (FOS) was introduced t...... hiện toàn bộ
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