Ionospheric model correction for spaceborne GNSS receiver

Kim, Eun-hyouek; Koh, Dong-Wook; Sayegh, Amer Mohammad Al; Midfa, Ibrahim Abdulla Al

doi:10.1109/euronav.2017.7954212

Cited by 3 publications

(5 citation statements)

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“…The gravity model in the orbit model was switched from the EGM96 to the GGM03. The orbital frame of the orbit determination logic was converted from Earth-centered inertial (ECI) to radial, in-track, cross-track (RIC) to make the covariance of measurement represent the error characteristic of ionospheric time delay, which degrades the position accuracy of SPS up to 60 m [14]. This is the first application of GGM03 and RIC to the on-board real-time orbit determination logic.…”

Section: Sensitivity Of Orbital Frame For Orbit Determinationmentioning

confidence: 99%

“…The ionospheric time delay from the low-elevation angle of the signal degrades the position accuracy up to several tens of meters [14]. When analyzing the error caused by ionospheric time delay with respect to the ECI frame, there is a disadvantage in that the error is distributed to each axis, as shown in Figure 5a.…”

Section: Efficacy Of the Ric Frame For Identifying Ionospheric Time Dmentioning

confidence: 99%

“…The ionospheric time delay for the spaceborne GPS receiver at altitudes of 400 km, 500 km, and 600 km can be estimated using the electron density from the International Reference Ionosphere (IRI), as shown in Figure 4b. The ionospheric time delay from the low-elevation angle of the signal degrades the position accuracy up to several tens of meters [14]. When analyzing the error caused by ionospheric time delay with respect to the ECI frame, there is a disadvantage in that the error is distributed to each axis, as shown in Figure 5a.…”

Section: Efficacy Of the Ric Frame For Identifying Ionospheric Time Dmentioning

confidence: 99%

“…Thus, if the orbit determination logic is designed on the orbital frame, which has a position vector like the RIC frame, the covariance of the measurement noise can be designed more precisely, and it will improve the performance of the navigation solutions. Features of ionospheric time delay affecting pseudo-range according to the incidence angle of the navigation signal [14]. (a) The practical tendency of ionospheric time delay can be summarized as being likely to receive the navigation signal from a negative incidence angle.…”

Section: Efficacy Of the Ric Frame For Identifying Ionospheric Time Dmentioning

confidence: 99%

“…Features of ionospheric time delay affecting pseudo-range according to the incidence angle of the navigation signal[14]. (a) The practical tendency of ionospheric time delay can be summarized as being likely to receive the navigation signal from a negative incidence angle.…”

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confidence: 99%

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Sensitivity of the Gravity Model and Orbital Frame for On-board Real-Time Orbit Determination: Operational Results of GPS-12 GPS Receiver

Kim¹,

Han²,

Sayegh

2019

Remote Sensing

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This paper describes the sensitivity of both the orbital frame domain selection and the gravity model on the performance of on-board real-time orbit determination. Practical error sources, which affect the navigation solution of spaceborne global positioning system (GPS) receivers, are analyzed first. Then, a reasonable orbital frame (radial, in-track, cross-track (RIC)) is proposed to clearly represent the characteristics of the error in order to improve the performance of the orbit determination (OD) logic. In addition, the sensitivity of the gravity model affecting the orbit determination logic is analyzed by comparison with the precise orbit ephemeris (POE) of the Challenging Minisatellite Payload (CHAMP) satellite, and it is confirmed that the Gravity Recovery And Climate Experiment (GRACE) Gravity Model 03 (GGM03) outperforms the Earth Gravity Model 1996 (EGM96). The effects of both proposed orbit frames and the gravity model on the orbit determination logic are verified using a GPS simulator and observation data from the CHAMP satellite. Moreover, the practical performance of on-board real-time orbit determination logic is verified by updating the software of the spaceborne GPS receiver, GPS-12, on DubaiSat-2 operating at low Earth orbit (LEO). The results show that the position accuracy of on-board real-time orbit determination logic in GPS-12 is improved by 59%, from 12.6 m (1 σ) to 5.1 m (1 σ), after applying the proposed methods. The velocity accuracy is also improved by 57%, from 13.7 mm/s (1 σ) to 5.9 mm/s (1 σ).

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Section: Sensitivity Of Orbital Frame For Orbit Determinationmentioning

confidence: 99%

Section: Efficacy Of the Ric Frame For Identifying Ionospheric Time Dmentioning

confidence: 99%

Section: Efficacy Of the Ric Frame For Identifying Ionospheric Time Dmentioning

confidence: 99%

Section: Efficacy Of the Ric Frame For Identifying Ionospheric Time Dmentioning

confidence: 99%

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confidence: 99%

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