Results 71 to 80 of about 163,832 (185)
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 +5 more
wiley +1 more source
Detection of elusive Radio and Optical emission from Cosmic-ray showers in the 1960s
, 2011 During the 1960s, a small but vibrant community of cosmic ray physicists, pioneered novel optical methods of detecting extensive air showers (EAS) in the Earth's atmosphere with the prime objective of searching for point sources of energetic cosmic gamma-
Fegan, David J.
core +1 more source
BeiDou satellite-induced code pseudorange variations: diagnosis and therapy
GPS Solutions, 2015 Code pseudorange measurements of the Chinese GNSS BeiDou reveal variations which result in code–phase divergences of more than 1 m. We have analyzed these delay variations based on observation data of the International GNSS Service and its Multi-GNSS ...
L. Wanninger, S. Beer
semanticscholar +1 more source
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 +4 more
wiley +1 more source
Application of GPS tracking techniques to orbit determination for TDRS [PDF]
In this paper, we evaluate two fundamentally different approaches to TDRS orbit determination utilizing Global Positioning System (GPS) technology and GPS-related techniques. In the first, a GPS flight receiver is deployed on the TDRSS spacecraft.
Haines, B. J. +3 more
core +1 more source
TEMPO2, a new pulsar timing package. I: Overview
, 2006 Contemporary pulsar timing experiments have reached a sensitivity level where systematic errors introduced by existing analysis procedures are limiting the achievable science.
Backer +50 more
core +1 more source
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 +9 more
wiley +1 more source
Subnanosecond GPS-based clock synchronization and precision deep-space tracking [PDF]
Interferometric spacecraft tracking is accomplished by the Deep Space Network (DSN) by comparing the arrival time of electromagnetic spacecraft signals at ground antennas separated by baselines on the order of 8000 km. Clock synchronization errors within
Border, J. S. +3 more
core +1 more source
Satellite Emission Range Inferred Earth Survey (SERIES) project [PDF]
The Global Positioning System (GPS) was developed by the Department of Defense primarily for navigation use by the United States Armed Forces. The system will consist of a constellation of 18 operational Navigation Satellite Timing and Ranging (NAVSTAR ...
Buennagel, L. A. +4 more
core +1 more source
Remote SensingThe 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