Results 21 to 30 of about 18,409 (254)
Vertical Protection Level Optimization and Availability Analysis for Advanced RAIM
Frontiers in Energy Research, 2022 With the introduction of global navigation satellite systems (GNSSs) in aviation, there has been increased dependency on GNSS position. Multi-constellation GNSS services and equipment will remain a solution for many aircraft positions in safety.
Ershen Wang +7 more
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Optimized Selection of Satellite Subsets for a Multi-constellation GBAS [PDF]
The International Technical Meeting of the The Institute of Navigation, 2016 In the next generation of Ground Based Augmentation System (GBAS) corrections and integrity parameters for two frequencies and multiple constellations will be provided. However, the capacity of the VDB (VHF Data Broadcast) link providing those parameters to users is strongly limited.
Gerbeth, Daniel +3 more
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Multi-constellation GBAS: How to benefit from a second constellation [PDF]
2016 IEEE/ION Position, Location and Navigation Symposium (PLANS), 2016 In this paper we analyze and discuss the impact of ionospheric scintillations and multipath on the availability of the current single-frequency single-constellation Ground Based Augmentation System (GBAS). Scintillation effects, which usually occur around plasma bubbles, cause the receiver to lose lock of one or more satellites, leading to potentially ...
Caamano, Maria +3 more
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Analysis of Multi-Constellation GNSS Signal Quality [PDF]
The International Technical Meeting of the The Institute of Navigation, 2016 The code pseudo-ranges and phase pseudo-ranges are affected by the systematic errors or biases and random noises. These errors can be classified into three groups, satellite related errors, propagation-medium related errors and receiver related errors (Hofmann-Wellenhof, Lichtenegger and Collins 2001; Leick 2004).
Terri Richardson +3 more
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Optimization of Multi-Mission CubeSat Constellations with a Multi-Objective Genetic Algorithm
Remote Sensing, 2023 The increasing demand for low-cost space-borne Earth observation missions has led to small satellite constellation systems development. CubeSat platforms can provide a cost-effective multiple-mission space system using state-of-the-art technology.
Shimeles Demissie Melaku, Hae-Dong Kim
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Research on optimization method of reconnaissance constellation based on multi-objective evolutionary algorithm [PDF]
Zhihui kongzhi yu fangzhenIn order to further solve the optimization problem of reconnaissance constellation and strengthen the construction of space-based reconnaissance system, the current optimization methods of reconnaissance constellation are studied and summarized.
LIU Yali, XIONG Wei
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Applied Sciences, 2020 The received global navigation satellite system (GNSS) signal has a very low power due to traveling a very long distance and to the nature of the signal’s propagation medium. Thus, GNSS signals are easily susceptible to signal interference.
Haidy Elghamrawy +3 more
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Multi-constellation GNSS scintillation at mid-latitudes [PDF]
2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 2017 Radio wave scintillation can result in severe channel fading and random phase variations that can interfere with the performance of a radar, communication or GPS system. While it is well known that Ionospheric scintillation occurs within the high and low latitude regions, there has been minimal research done within the middle latitudes. However, recent
Marc H. Jean +2 more
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Multi‐constellation ARAIM exploiting satellite motion
NAVIGATION, 2020 In this work, a new time-sequential positioning and fault detection method is developed for dual-frequency, multi-constellation Advanced Receiver Autonomous Integrity Monitoring (ARAIM). Unlike conventional “snapshot” ARAIM, sequential ARAIM exploits changes in satellite geometry at the cost of slightly higher computation and memory loads.
Mathieu Joerger, Boris Pervan
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Influence of station density and multi-constellation GNSS observations on troposphere tomography [PDF]
Annales Geophysicae, 2019 Troposphere tomography, using multi-constellation observations from global navigation satellite systems (GNSSs), has become a novel approach for the three-dimensional (3-D) reconstruction of water vapour fields.
Q. Zhao, K. Zhang, K. Zhang, W. Yao
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