A secular variation candidate for IGRF-14 based on core-flow inversion via an ensemble Kalman smoother [PDF]
Earth, Planets and SpaceWe present a candidate mean secular variation (SV) model for the 2025.0 $$-$$ - 2030.0 period. The forecasted SV is produced with a data assimilation (DA) system built around a simple frozen-flux model of the core flow and magnetic field near the core ...
Kyle Gwirtz +2 more
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Implementation of the variation of the luni-solar acceleration into GLONASS orbit calculus [PDF]
Geodetski Vestnik, 2021 In the differential equation system describes the motion of GLONASS satellites (rus. Globalnaya Navigazionnaya Sputnikovaya Sistema, or Global Navigation Satellite System ), the acceleration caused by the luni-solar traction is often taken as a constant ...
Sid Ahmed Medjahed +3 more
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There is no six-year periodicity in tidal forcing [PDF]
Scientific ReportsR. D. Ray, V. Viswanathan, B. F. Chao
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Near Real-Time Ionospheric Modeling Using a Regional GPS Network [PDF]
Journal of Astronomy and Space Sciences, 2005 Ionosphere is deeply coupled to the space environment and introduces the perturbations to radio signal because of its electromagnetic characteristics.
Byung-Kyu Choi +3 more
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RF Environment Test on a Proposed Site for the Sensor Station of the Next Generation Satellite Navigation System, GALILEO: I. The Result of the Test on the Vicinity of KVN Tamla Site in the Year of 2006 by KASI [PDF]
Journal of Astronomy and Space Sciences, 2008 As the next generation of global satellite navigation system, the Galileo project is about to witness an initial orbit validation stage as the successful test of navigation message transmission from Giove-A in 2007.
Jung Hyun Jo +12 more
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Operation of the Radio Occultation Mission in KOMPSAT-5 [PDF]
Journal of Astronomy and Space Sciences, 2010 Korea multi-purpose satellite-5 (KOMPSAT-5) is a low earth orbit (LEO) satellite scheduled to be launched in 2010. To satisfy the precision orbit determination (POD) requirement for a high resolution synthetic aperture radar image of KOMPSAT-5, KOMPSAT-
Mansoo Choi +3 more
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Multiwavelength Frequency Modulated CW Ladar: The Effect of Refractive Index
Photonics, 2020 Frequency modulated continuous wave (FMCW) laser detection and ranging is a technique for absolute distance measurements with high performances in terms of resolution, non-ambiguity range, accuracy and fast detection. It is based on a simple experimental
Mariano Barbieri +3 more
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Receiver DCB Estimation and Analysis by Types of GPS Receiver [PDF]
Journal of Astronomy and Space Sciences, 2010 This paper analyzes that the global positioning system (GPS) receiver differential code bias (DCB) has effect on the estimation the ionosphere total electron content (TEC). The data from nine permanent GPS sites of the Korea Astronomy and Space Science
Byung-Kyu Choi +2 more
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Ionospheric Behaviors Over Korea Peninsula During the Super Geomagnetic Storm Using GPS Measurements [PDF]
Journal of Astronomy and Space Sciences, 2009 The super-geomagnetic storms called 2003 Halloween event globally occurred during the period of 29 through 31 which are the following days when the solar flares of X18 class exploded on 28 October 2003.
Jong-Kyun Chung +4 more
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Scientific Data, 2021 Measurement(s) C-band radar backscatter • extent of permanent water bodies Technology Type(s) Synthetic Aperture Radar (SAR) • Synthetic Aperture Radar (SAR) normalised mosaic Factor Type(s) radar backscatter Sample Characteristic - Environment land ...
Bernhard Bauer-Marschallinger +11 more
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