Results 51 to 60 of about 192 (150)

A Satellite Drift Scan Approach for Establishing the Pointing Model of Radio Telescopes

Advances in Astronomy, Volume 2025, Issue 1, 2025.
In the era of large satellite constellations, there are more than 1000 satellites in orbit. While the signals from these satellites may pose a risk of radio frequency interference (RFI) to radio telescopes, they also present a potential advantage by serving as high‐spatial‐density pointing references for radio telescopes.
Ye Yuan, Zhi-Yong Liu, Na Wang, Hao Yan, Arpan Hazra   +4 more
wiley   +1 more source

Robust factor graph optimisation method for shipborne GNSS/INS integrated navigation system

IET Radar, Sonar &Navigation, Volume 18, Issue 5, Page 782-798, May 2024.
An adaptive factor based on pseudorange residual judgement is proposed to improve the accuracy of ship‐borne robust factor graph optimisation integrated navigation method. Using the historical information in the sliding window to estimate the occluded satellite signal.
Yuan Hu, Haozheng Li, Wei Liu
wiley   +1 more source

Method and Validation of Real‐Time Global Ionosphere Modeling Constraint by Multi‐Source GNSS/LEO Data

Space Weather, Volume 22, Issue 4, April 2024.
Abstract This study applies the zero‐differenced integer ambiguity method, named PPP‐Fixed, to extract real‐time ionospheric data and eliminate the latencies of rapid/final Global Ionosphere Maps (GIMs). The PPP‐Fixed method is also used to derive ionospheric data for post‐processed GIM generation, named SGG Post‐GIM, combined with low earth orbit ...
Jun Chen, Xiaodong Ren, Guozhen Xu, Pengxin Yang, Hang Liu, Xiaohong Zhang   +5 more
wiley   +1 more source

Recognition of objects in orbit and their intentions with space‐borne sub‐THz Inverse Synthetic Aperture Radar

IET Radar, Sonar &Navigation, Volume 18, Issue 4, Page 564-576, April 2024.
The paper describes a processing scheme to extract discriminating features from Inverse Synthetic Aperture Radar images of objects in space and how these discriminators can be used to recognise or to estimate the intention of these objects. It describes how electromagnetic simulation can be used to create images to train the object recognition ...
Mikhail Cherniakov, Edward G. Hoare, Marina Gashinova, Emidio Marchetti, Andrew G. Stove   +4 more
wiley   +1 more source

Orbit Determination of China’s Space Station Using Real ISL Measurements of the Tianzhou‐6 Spacecraft

International Journal of Aerospace Engineering, Volume 2024, Issue 1, 2024.
Under most circumstances, the current studies related to precision orbit determination (POD) using intersatellite link (ISL) measurements are limited to ISL ranging components. In this article, we would like to discuss the idea of jointly using the GNSS observations and ISL ranging and orientation measurements of the Tianzhou‐6 (TZ‐6) spacecraft to ...
Haijian Fang, Fan Wang, Xueming Yu, Baohua Wang, Jiasong Wang, Yufan He, Minzhang Han, Dan Wang, Jingqi Huang, Zhiguang Song   +9 more
wiley   +1 more source

GPS and Galileo Precise Point Positioning Performance with Tropospheric Estimation Using Different Products: BRDM, RTS, HAS, and MGEX

Remote Sensing
The performance of Precise Point Positioning (PPP) using different Global Navigation Satellite System (GNSS) product sets, including broadcast ephemerides, International GNSS Service Real-Time Service (IGS-RTS) corrections, Galileo High Accuracy Service (
Damian Kiliszek
doaj   +1 more source

SISRE of BDS-3 MEO: Evolution as Well as Comparison between D1 and B-CNAV (B-CNAV1, B-CNAV2) Navigation Messages

Remote Sensing
The signal-in-space range error (SISRE) has a direct impact on the performance of global navigation satellite systems (GNSSs). It is an important indicator of navigation satellite space server performance.
Zhenghua Dong, Songlin Zhang
doaj   +1 more source

Application of "Galileo High Accuracy Service" on Single-Point Positioning. [PDF]

Sensors (Basel), 2023
Angrisano A, Ascione S, Cappello G, Gioia C, Gaglione S.   +4 more
europepmc   +1 more source

The Implementation of Precise Point Positioning (PPP): A Comprehensive Review. [PDF]

Sensors (Basel), 2023
Elsheikh M, Iqbal U, Noureldin A, Korenberg M.   +3 more
europepmc   +1 more source

Neustrelitz Total Electron Content Model for Galileo Performance: A Position Domain Analysis. [PDF]

Sensors (Basel), 2023
Gioia C, Angrisano A, Gaglione S.
europepmc   +1 more source