A Study on Autonomous Update of Onboard Orbit Propagator
Journal of the Korean Society for Aeronautical & Space Sciences, 2003 A method of autonomous update is presented for onboard orbit propagator. On board propagator is an alternative means that could be used for navigation purpose in case of CPS receiver`s failure. Although the ground station is not a able to upload a new propagator, the onboard propagator must be maintained most up-to-date. For this, a filtering technique
Ok-Cheol Jeong, Tae-Su No, Sang-Ryul Lee
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YOLO-GRBI: An Enhanced Lightweight Detector for Non-Cooperative Spatial Target in Complex Orbital Environments [PDF]
EntropyNon-cooperative spatial target detection plays a vital role in enabling autonomous on-orbit servicing and maintaining space situational awareness (SSA). However, due to the limited computational resources of onboard embedded systems and the complexity of
Zimo Zhou +4 more
doaj +2 more sources
Remote Sensing, 2022 Atmospheric drag provides an indirect approach for evaluating atmospheric mass density, which can be derived from the Precise Orbit Determination (POD) of Low Earth Orbit (LEO) satellites. A method was developed to estimate nongravitational acceleration,
Yueqiang Sun +15 more
doaj +1 more source
Stochastic noise modelling of kinematic orbit positions in the Celestial Mechanics Approach [PDF]
Advances in Geosciences, 2020 Gravity field models may be derived from kinematic orbit positions of Low Earth Orbiting satellites equipped with onboard GPS (Global Positioning System) receivers.
M. Lasser +3 more
doaj +1 more source
Evaluation of a Laser Altimeter using the Pseudo-Random Noise Modulation Technique for Apophis Mission [PDF]
Journal of Astronomy and Space Sciences, 2021 Apophis is a near-Earth object with a diameter of approximately 340 m, which will come closer to the Earth than a geostationary orbit in 2029, offering a unique opportunity for characterizing the object during the upcoming encounter.
Hyung-Chul Lim +7 more
doaj +1 more source
Q-Band LEO Earth Observation Data Downlink: Radiowave Propagation and System Performance
IEEE Access, 2021 Earth Exploration Satellite Service (EESS) systems gather data about the Earth and its natural phenomena. Frequency bands traditionally employed by high-rate telemetry to download data from the satellite to the ground station, such as the X band (8 GHz),
Felix Cuervo +3 more
doaj +1 more source
The Uncertainty of SNO Cross-Calibration for Satellite Infrared Channels
Remote Sensing, 2023 The on-orbit radiometric calibration is a fundamental task in quantitative remote sensing applications. A widely used calibration method is the cross-calibration based on Simultaneous Nadir Observation (SNO), which involves using high-precision reference
Zhong Gu +5 more
doaj +1 more source
Development of Kinematic Ephemeris Generator for Korea Pathfinder Lunar Orbiter (KPLO)
Journal of Astronomy and Space Sciences, 2020 This paper presents a kinematic ephemeris generator for Korea Pathfinder Lunar Orbiter (KPLO) and its performance test results. The kinematic ephemeris generator consists of a ground ephemeris compressor and an onboard ephemeris calculator.
Min-Sup Song +3 more
doaj +1 more source
Chorus source region localization in the Earth's outer magnetosphere using THEMIS measurements [PDF]
Annales Geophysicae, 2010 Discrete ELF/VLF chorus emissions, the most intense electromagnetic plasma waves observed in the Earth's radiation belts and outer magnetosphere, are thought to propagate roughly along magnetic field lines from a localized source region near the ...
O. Agapitov +7 more
doaj +1 more source
Research on Coded Caching-Enabled Cooperative Transmission Mechanism in LEO Small Satellite Network
天地一体化信息网络, 2021 Along with the rapid development of low earth orbit (LEO) small satellite network, users can access content retrieval service through dense-deployed LEO satellite networks in the future.Due to the long propagation delay of satellite-to-terrestrial link ...
Jian LI, Kaiping XUE, Hancheng LU
doaj +2 more sources