Electron density profiles probed by radio occultation of FORMOSAT-7/COSMIC-2 at 520 and 800 km altitude

Liu, J. Y.; Lin, Chia Ying; Tsai, Heng

doi:10.5194/amt-8-3069-2015

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Although the TGRS orbit electron density and IVM ion density generally show a good agreement, it is a challenge to evaluate the accuracy of IVM ion density since the TGRS orbit electron density has systematic errors due to the spherical symmetry assumption. Therefore, observing system simulation experiments (OSSEs) are performed to assess the systematic errors in TGRS orbit electron density observations (e.g., Liu et al 2015, Chou et al 2017. Yue et al (2011) indicated that the solar activity would not influence the relative Abel errors of electron density.…”

Section: Observing System Simulation Experimentsmentioning

confidence: 99%

Validation of FORMOSAT-7/COSMIC2 IVM ion density and TGRS orbit electron density

Chou¹,

Braun²,

Wu³

et al. 2021

Terr. Atmos. Ocean. Sci.

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Section: Observing System Simulation Experimentsmentioning

confidence: 99%

Validation of FORMOSAT-7/COSMIC2 IVM ion density and TGRS orbit electron density

Chou¹,

Braun²,

Wu³

et al. 2021

Terr. Atmos. Ocean. Sci.

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“…The constellation is primarily used to collect atmospheric data for weather forecasting, ionospheric, climate, and gravity studies [1][2][3][4]. The satellite has a design lifetime of 5 years, an orbital inclination of 24 degrees, an altitude of 550 km, and an orbit around the Earth of approximately 97 minutes [1,5]. Each of the six satellites is equipped with two POD antennas, the forward antenna (+ X POD antenna, in the direction of satellite ight) and the rear antenna (-X POD antenna, backward to the direction of satellite ight), and each satellite is equipped with a Tri-GNSS radio occultation receiver system (TGRS) receiver that can obtain GPS and GLONASS signals to achieve POD of COSMIC-2 [6-8].…”

Section: A Subsection Samplementioning

confidence: 99%

Precise Estimation of Phase Center Variation of the Onboard GPS Antenna and Its Influence on POD for COSMIC-2

Kong

Chen

Bai

et al. 2023

Preprint

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COSMIC-2 occultation meteorological observations can provide meteorological information at 50 degrees north and south latitudes to improve the accuracy of weather forecasting, especially for extreme weather (such as typhoon and rainstorm) forecasting. In order to ensure the smooth operation of COSMIC-2 satellite mission, it is necessary to achieve the precise orbit determination (POD) of COSMIC-2. In the processing of satellite borne GPS data, the error source of receiver antenna phase center error is very important. Based on GPS observation data, in orbit correction of the phase center variation (PCV) of the COSMIC-2 satellite borne GPS receiver antenna can improve the accuracy of satellite orbit determination. In this study, the PCV model is estimated in orbit using two methods, the direct method and the residual method, and the obits of COSMIC-2 satellites are determined by reduced dynamic method using the onboard GPS data. The orbit overlap comparison and the reference orbit comparison are used to evaluate the internal and external conformity accuracy, respectively, and the impact of the PCV model estimated by two methods on its precision orbiting are analyzed and compared. The results show that the orbit overlap validation accuracy is better than 1.27cm, 2.07cm and 1.05cm in radial (R), tangential (T) and normal (N) directions, respectively, and the root mean square (RMS) value in three-dimensional (3D) direction does not exceed 2.57cm without PCV model; the reference orbit comparison accuracy is better than 9.97cm, 13.34cm and 4.77cm in R, T and N directions, respectively, and the RMS value in 3D direction does not exceed 17.51cm. After adding the PCV models estimated by the direct method and the residual method, the RMS values of the orbit overlap comparison have the accuracy improvements of 2.5mm and 1.3mm in the 3D direction, and the RMS values of the reference orbit comparison are improved by 1.1mm and 2.1mm in the 3D direction, respectively.

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“…It is a continuation of COSMIC-1 mainly used to collect atmospheric data for weather prediction, ionosphere and gravity research [3,4]. COSMIC-2 constellation contains six satellites, the designed orbit inclination is 24 degrees with occultations primarily distributed from 45 • N and 45 • S, the designed life is 5 years, the initial orbit altitude is 750 km, and the final orbit is 525 km, and it takes about 100 min to fly around the earth per circle [1,5]. In order to realize the scientific function of the constellation and provide the basis for scientific data, each satellite is equipped with the advanced Tri-GNSS radio occultation (RO) system (TGRS) receiver, and its two orbit determination antennas are POD + X and POD − X respectively.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Space-Borne GPS Data Quality and Evaluation of Precise Orbit Determination for COSMIC-2 Mission Based on Reduced Dynamic Method

Kong¹,

Chen²,

Fang³

et al. 2022

Remote Sensing

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COSMIC-2 is a remote sensing satellite mission that mainly provides scientific data for weather forecasting, ionosphere, and climate research. High precise orbit is the basis for the application of remote sensing satellite data. In order to realize the precise orbit determination (POD) of COSMIC-2, we have assessed the quality of space-borne GPS observation in detail, including the utilization of GPS observations, cycle slip ratio (o/slps), multipath error, single-noise ratio (SNR) and ionospheric delay rate (IOD) of the data, realized the POD of COSMIC-2 with the reduced dynamic (RD) method, and evaluated the accuracy of the solved orbit by means of the carrier-phase residual, overlapping orbit comparison and the reference orbit comparison. The data quality assessments show that the data is less affected by the multipath effect, the utilization of the data is low, cycle slips occur frequently, and the carrier-phase data is often interrupted. The POD results indicate that the root mean square (RMS) values of the carrier-phase residuals of six COSMIC-2 satellites are between 6.0 mm and 7.5 mm, The mean RMS values of the overlapping orbit are better than 0.92 cm, 1.33 cm and 1.03 cm in the radial (R), tangential (T) and normal (N) directions respectively, and the mean RMS values of the six satellites in the 3D direction are between 1.38 cm and 1.75 cm. The mean RMS values in R, T and N directions orbit determination accuracy of the reference orbit comparison are better than 5.61 cm, 6.59 cm and 2.29 cm respectively, and the mean RMS values of the six satellites in the 3D direction are between 7.35 cm and 8.79 cm.

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Electron density profiles probed by radio occultation of FORMOSAT-7/COSMIC-2 at 520 and 800 km altitude

Cited by 7 publications

References 9 publications

Validation of FORMOSAT-7/COSMIC2 IVM ion density and TGRS orbit electron density

Validation of FORMOSAT-7/COSMIC2 IVM ion density and TGRS orbit electron density

Precise Estimation of Phase Center Variation of the Onboard GPS Antenna and Its Influence on POD for COSMIC-2

Analysis of Space-Borne GPS Data Quality and Evaluation of Precise Orbit Determination for COSMIC-2 Mission Based on Reduced Dynamic Method

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