Sieve Search Centroiding Algorithm for Star Sensors [PDF]
Sensors, 2023 The localization of the center of the star image formed on a sensor array directly affects attitude estimation accuracy. This paper proposes an intuitive self-evolving centroiding algorithm, termed the sieve search algorithm (SSA), which employs the ...
Vivek Chandran Karaparambil +2 more
exaly +5 more sources
Star Centroiding Based on Fast Gaussian Fitting for Star Sensors
Sensors, 2018 The most accurate star centroiding method for star sensors is the Gaussian fitting (GF) algorithm, because the intensity distribution of a star spot conforms to the Gaussian function, but the computational complexity of GF is too high for real-time ...
Xiaowei Wan, Gangyi Wang, Xinguo Wei
exaly +4 more sources
Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE
Journal of Imaging, 2018 The energy-dependence of the neutron cross section provides vastly different contrast mechanisms than polychromatic neutron radiography if neutron energies can be selected for imaging applications.
Adrian S Losko +2 more
exaly +4 more sources
Large dynamic range Shack-Hartmann wavefront sensing based on a graph-theoretic computational model [PDF]
Light: Science & ApplicationsThe Shack-Hartmann wavefront sensor (SHWS) is a widely used non-interferometric wavefront measurement technique. However, for high-slope wavefronts, spot crosstalk and asymmetric distortion cause severe matching ambiguity and centroiding errors.
Lintong Du +9 more
doaj +2 more sources
Improved positioning criterion and imaging scheme of deep UV planar laser-induced fluorescence technology [PDF]
iScienceSummary: In summary, we have developed a physical model to describe the evolution of the nitric oxide-based planar laser-induced fluorescence technology (NO-PLIF) signal in a high-enthalpy wind tunnel and analyzed the factors that affect the contrast of ...
Hongchun Wu +5 more
doaj +2 more sources
IEEE Access, 2019 Extracting accurate star centroids in the observed star images is one of the key problems for image navigation of the geosynchronous interferometric infrared sounder (GIIRS) of Fengyun-4A Satellite (FY-4A), the first scientific experimental satellite of ...
Haopeng Zhang, Lei Yang, Jian Shang
exaly +3 more sources
Simulation of Dense Star Map in Deep Space Based on Gaia Catalogue [PDF]
SensorsHigh-fidelity star field simulation is paramount for target detection and space situational awareness (SSA) in geostationary and deep-space environments.
Puzhen Li +3 more
doaj +2 more sources
Large field-of-view event-mode camera for high-precision epithermal neutron resonance imaging [PDF]
Scientific ReportsA large-area event-mode camera system coupled with a $$^{6}$$ LiF-ZnS:Ag scintillator is applied for neutron resonance imaging (NRI) on the energy-resolved neutron imaging (ERNI) flight path, also known as Flight Path 5 (FP5), at the Los Alamos Neutron ...
Tsviki Y. Hirsh +5 more
doaj +2 more sources
The First Application of a Gd3Al2Ga3O12:Ce Single-Crystal Scintillator to Neutron Radiography
Journal of Imaging, 2021 Neutron radiography is regarded as complementary to X-ray radiography in terms of transmittance through materials, but its spatial resolution is still insufficient.
Kazuhisa Isegawa +3 more
doaj +1 more source
Stratospheric temperature measurements from nanosatellite stellar occultation observations of refractive bending [PDF]
Atmospheric Measurement Techniques, 2023 Stellar occultation observations from space can probe the stratosphere and mesosphere at a fine vertical scale around the globe. Unlike other measurement techniques like radiosondes and aircraft, stellar occultation has the potential to observe the ...
D. L. McGuffin +8 more
doaj +1 more source