FORMOSAT-3/COSMIC GPS Radio Occultation Mission: Preliminary Results

Liou, Yuei-An; Pavelyev, A. G.; Liu, Shuo-Fang; Yen, Nick; Huang, Ching Yuang; Fong, Chen-Joe

doi:10.1109/tgrs.2007.903365

Cited by 132 publications

(50 citation statements)

References 47 publications

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“…The primary scientific goal of the mission is to demonstrate the value of near-real-time GPS RO observation in operational numerical weather prediction. With the ability of performing both rising and setting occultation, the mission provides about 1,600~2,400 atmospheric and ionospheric soundings per day in near real-time that give vertical profiles of temperature, pressure, refractivity, and water vapor in neutral atmosphere, and electron density in the ionosphere with global coverage (Anthes et al, & 2008Liou et al, 2006aLiou et al, , 2006bLiou et al, , & 2007Fong et al, 2008aFong et al, & 2009a.…”

Section: Gnss Radio Occultation Missionmentioning

confidence: 99%

“…The mission results have shown that the RO data from FORMOSAT-3 are of better quality than those from previous missions and penetrate much further down into the troposphere, mission results could be referred to Liou et al (2007), Anthes et al (2008), Fong et al (2008a, 2008c& 2009a), and Huang et al (2009. In the near future, other GNSS, such as the Russian Global Navigation Satellite System (GLONASS), and the planned European Galileo system, could be used to extend the applications by the use of RO technique Fong et al, 2009aFong et al, & 2009b.…”

Section: Gnss Radio Occultation Missionmentioning

confidence: 99%

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Global GNSS Radio Occultation Mission for Meteorology, Ionosphere & Climate

Yen¹,

Fong²,

Chu³

et al. 2010

Aerospace Technologies Advancements

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Section: Gnss Radio Occultation Missionmentioning

confidence: 99%

Section: Gnss Radio Occultation Missionmentioning

confidence: 99%

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere & Climate

Yen¹,

Fong²,

Chu³

et al. 2010

Aerospace Technologies Advancements

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“…The de ci sion was made to put the FM2 or bit trans fer on hold in Oc to ber 2006 to al low FM2 to fur ther sep a rate from FM5. The com ple tion of the fi nal con stel lation con se quently shifted from May to De cem ber 2007 Liou et al 2007). …”

Section: Con Stel La Tion Plan Evo Lu Tionmentioning

confidence: 99%

FORMOSAT-3/COSMIC Spacecraft Constellation System, Mission Results, and Prospect for Follow-On Mission

Fong¹,

Yen²,

Chu³

et al. 2009

Terr. Atmos. Ocean. Sci.

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AB STRACTThe FORMOSAT-3/COS MIC space craft con stel la tion con sist ing of six LEO sat el lites is the world's first op er a tional GPS Ra dio Occultation (RO) mis sion. The mis sion is jointly de vel oped by Tai wan's Na tional Space Or ga ni za tion (NSPO) and the United States' UCAR in col lab o ra tion with NSF, USAF, NOAA, NASA, NASA's Jet Pro pul sion Lab o ra tory, and the US Na val Re search Lab o ra tory. The FORMOSAT-3/COS MIC sat el lites were suc cess fully launched from Vandenberg US AFB in Cal i for nia at 0140 UTC 15 April 2006 into the same or bit plane of the des ig nated 516 km al ti tude. The mis sion goal is to de ploy the six sat el lites into six or bit planes at 800 km al ti tude with a 30-de gree sep a ra tion for evenly dis trib uted global cov er age. All six FORMOSAT-3/COS MIC sat el lites are cur rently main tain ing a sat is fac tory good state-of-health. Five out of six sat el lites have reached their fi nal mis sion or bit of 800 km as of No vem ber 2007. The data as re ceived by FORMOSAT-3/COS MIC sat el lites con stel la tion have been pro cessed in near real time into 2500 good ion o spheric pro files and 1800 good at mo spheric pro files per day. These have out num bered the world wide ra dio sondes (~900 mostly over land) launched from the ground per day. The pro cessed at mo spheric RO data have been as sim i lated into the Nu mer i cal Weather Pre dic tion (NWP) mod els for real-time weather pre dic tion and ty phoon/hur ri cane fore cast ing by many ma jor weather cen ters in the world. This pa per de scribes the FORMOSAT-3/COS MIC sat el lite con stel la tion sys tem per for mance and the mission results that span the period from April 2006 to October 2007; and reviews the prospect of a future follow-on mission.Key words: FORMOSAT-3, COS MIC, GPS ra dio occultation, Re mote sens ing, Con stel la tion de ploy ment, Or bit rais ing, Sat el lite, Op er a tion challenges Ci ta tion: Fong, C. J., N. L. Yen, C. H. Chu, S. K. Yang, W. T. Shiau, C. Y. Huang, S. Chi, S. S. Chen, Y. A. Liou, and Y. H. Kuo, 2009: FORMOSAT-3/COS MIC space craft con stel la tion sys tem, mis sion re sults, and pros pect for fol low-on mis sion. Terr. Atmos. Ocean. Sci., 20, 1-19, doi: 10.3319/ TAO.2008.01.03.01(F3C) IN TRO DUC TIONRa dio Occultation (RO) tech niques have been used in outer space to probe plan e tary ion o spheres and at mo spheres for over four de cades. In the early 1960s, sci ence teams at JPL/NASA and Stan ford Uni ver sity de vel oped one-way and two-way ra dio occultation tech niques, re spec tively, to probe Mars. The com bined tech niques have since been used to probe the at mo sphere of al most ev ery planet and their moons in the so lar sys tem Kliore et al. 1965;Mel bourne et al. 1994;Yunck et al. 2000).The GPS/MET ex per i ment (1995 -1997) car ried aboard the NASA-spon sored MICROLAB I sat el lite showed that the at mo spheric limb-sound ing tech nique us ing ra dio signals trans mit ted from GPS sat el lites of fers cer tain ad vantages over the tra di tional pas s...

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“…Furthermore, the shape of the earth is assumed as an ellipse and ECMWF analysis, which is a global coverage analysis model, is used to describe the structure of the atmosphere. The initial and end points, which are fixed to the position of GPS and LEO satellites, are recorded in Formosat-3/COSMIC (Liou et al 2007) RO observation data. During signal trajectory integration the refractive index at the given point in the atmosphere is calculated from the near ECMWF grids using cubic spline.…”

Section: Introductionmentioning

confidence: 99%

Ray Tracing Simulation in Nonspherically Symmetric Atmosphere for GPS Radio Occultation

Yeh¹,

Huang²,

Chiu³

et al. 2014

Terr. Atmos. Ocean. Sci.

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A three-dimensional ray tracing model with aiming algorithms for global positioning system (GPS) signal is proposed to make simulations conform to the realistic radio occultation (RO) signal propagation. The two aiming algorithms used in this study ensure the initial and end point ray trajectories are located in the prescribed region. In past studies, the ray tracing techniques applied to the RO signal simulation usually assumed a spherically symmetrical atmosphere for simplicity. The exact GPS and low earth orbit (LEO) satellite locations are not considered in the simulation. These two assumptions make the simulation unrealistic for GPS signal propagation in the RO technique. In the proposed model, the shape of the earth is assumed as an ellipse. The information from European Centre for Medium-Range Weather Forecasts (ECMWF) analysis is used to setup the atmosphere in the simulation. Two aiming algorithms are developed to determine the initial signal propagating direction to make the simulated signal start from the prescribed GPS satellite position and end in the close vicinity of the LEO satellite position. An ideal spherical symmetric atmospheric structure is used to verify the ray tracing model. The fractional difference between real and simulated refractivity results is less than 0.1%. Otherwise, the GPS and LEO satellite position in the Formosat-3/COSMIC observation and the ECMWF analysis, considering the earth's flattening, is also used to verify the aiming algorithms. All of the simulated signals end in close vicinity to the LEO satellite position in the simulation results.

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FORMOSAT-3/COSMIC GPS Radio Occultation Mission: Preliminary Results

Cited by 132 publications

References 47 publications

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere & Climate

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere & Climate

FORMOSAT-3/COSMIC Spacecraft Constellation System, Mission Results, and Prospect for Follow-On Mission

Ray Tracing Simulation in Nonspherically Symmetric Atmosphere for GPS Radio Occultation

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FORMOSAT-3/COSMIC GPS Radio Occultation Mission: Preliminary Results

Cited by 132 publications

References 47 publications

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere &amp; Climate

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere &amp; Climate

FORMOSAT-3/COSMIC Spacecraft Constellation System, Mission Results, and Prospect for Follow-On Mission

Ray Tracing Simulation in Nonspherically Symmetric Atmosphere for GPS Radio Occultation

Contact Info

Product

Resources

About

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere & Climate

Global GNSS Radio Occultation Mission for Meteorology, Ionosphere & Climate