Characterizing GPS radio occultation loss of lock due to ionospheric weather

Yue, Xinan; Schreiner, William S.; Pedatella, N. M.; Kuo, Ying‐Hwa

doi:10.1002/2015sw001340

Cited by 67 publications

(88 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies found that ionospheric structures, such as the sporadic E (Es), equatorial plasma irregularities (EPIs), equatorial ionization anomaly (EIA), polar patches, and auroral blobs, can cause additional influence on the GNSS signal (e.g., Basu et al, 1980Basu et al, , 2002Crowley et al, 2000;Kintner et al, 2004Kintner et al, , 2007Yue et al, 2016). These ionospheric structures with spatial scales from hundreds of kilometers down to meters produce rapid fluctuations of the received signal phase and amplitude termed as scintillations.…”

Section: Introductionmentioning

confidence: 99%

Climatology of GPS signal loss observed by Swarm satellites

2018

View full text Add to dashboard Cite

Abstract. By using 3-year global positioning system (GPS) measurements from December 2013 to November 2016, we provide in this study a detailed survey on the climatology of the GPS signal loss of Swarm onboard receivers. Our results show that the GPS signal losses prefer to occur at both low latitudes between ±5 and ±20 • magnetic latitude (MLAT) and high latitudes above 60 • MLAT in both hemispheres. These events at all latitudes are observed mainly during equinoxes and December solstice months, while totally absent during June solstice months. At low latitudes the GPS signal losses are caused by the equatorial plasma irregularities shortly after sunset, and at high latitude they are also highly related to the large density gradients associated with ionospheric irregularities. Additionally, the highlatitude events are more often observed in the Southern Hemisphere, occurring mainly at the cusp region and along nightside auroral latitudes. The signal losses mainly happen for those GPS rays with elevation angles less than 20 • , and more commonly occur when the line of sight between GPS and Swarm satellites is aligned with the shell structure of plasma irregularities. Our results also confirm that the capability of the Swarm receiver has been improved after the bandwidth of the phase-locked loop (PLL) widened, but the updates cannot radically avoid the interruption in tracking GPS satellites caused by the ionospheric plasma irregularities. Additionally, after the PLL bandwidth increased larger than 0.5 Hz, some unexpected signal losses are observed even at middle latitudes, which are not related to the ionospheric plasma irregularities. Our results suggest that rather than 1.0 Hz, a PLL bandwidth of 0.5 Hz is a more suitable value for the Swarm receiver.

show abstract

Section: Introductionmentioning

confidence: 99%

Climatology of GPS signal loss observed by Swarm satellites

2018

View full text Add to dashboard Cite

show abstract

“…Since each scintillation measurement effectively represents an integrated quantity, there is an uncertainty in the exact location of each scintillation value along the RO plane. Assigning the scintillation to the tangent points will not influence the statistical analysis based on a large amount of data [ Yue et al ., ]. As explained by Straus et al .…”

Section: Methodsmentioning

confidence: 92%

“…Yue et al . [] reported a good correlation between the radio signal cycle slips and ionospheric E s and EFI based on COSMIC data. These studies demonstrated the usefulness of the COSMIC RO data in general for remotely sensing the terrestrial ionosphere scintillation on a global scale.…”

Section: Introductionmentioning

confidence: 99%

On the occurrence of F region irregularities over Haikou retrieved from COSMIC GPS radio occultation and ground‐based ionospheric scintillation monitor observations

Yue

Zhen³

et al. 2017

Radio Science

Self Cite

View full text Add to dashboard Cite

In this paper, the amplitude scintillation index (s4) derived from COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) radio occultation (RO) technique and ground‐based Ionospheric Scintillation Monitor (ISM) at Haikou station (geographic latitude: 20.0°N, geographic longitude: 110.3°E, and geomagnetic latitude: 10.02°N) is used to investigate the morphology of F region irregularities in the low latitudes of China. The RO events of tangent point within the range of 10–30°N latitude, 70–160°E longitude, and 150–500 km altitude are adopted to analyze the ionospheric scintillation characteristics. The percentage of ionospheric scintillation occurrence is computed to obtain its diurnal variations, seasonal trends, and the dependence on solar and geomagnetic activities. Based on a statistical analysis of a long‐term period data set (years 2007 to 2013), we found that the ionospheric scintillation occurrence from both techniques show similar variations. After sunset (18 LT), the scintillation occurrence increases rapidly and reaches the maximum 3 h later. Then it decreases rapidly till 04 LT and remains low level during the daytime. The ionospheric scintillation tends to occur more frequently during vernal and autumnal equinoxes, especially in March–April and September–October. The equinoctial asymmetry could be seen clearly from the ground‐based ISM observations. The peak ionospheric scintillation occurrence time varies with seasons. It is reached latest in summer, while in spring it is very close to that in autumn. The nighttime ionospheric scintillation occurrence tends to increase with increasing solar activities. The increasing tendency is more prominent in vernal and autumnal equinoxes than that in summer and winter. In general, the control of geomagnetic activities is apt to inhibit ionospheric scintillation at equinox nighttime. In summer and winter, the geomagnetic activities could either trigger or inhibit the generation of ionospheric irregularities in a much more complicated way. Thus, it can be concluded that the tangent point location does accurately represent the scattering region, at least in an average sense. The RO technique is demonstrated to be a useful tool for remotely sensing the terrestrial ionosphere on a global scale down to the regional scale in terms of scintillation occurrence.

show abstract

“…The high vertical resolution of RO observations enables us to distinguish clearly, on a global scale, the signal cycle slip (CS) resulting from different ionospheric layers. Based on COSMIC RO observations during 2007–2011, as shown in Figure 19, Yue XA et al (2016a) have comprehensively analyzed the CS occurrence and its correlation to the ionospheric weather phenomena such as Es, equatorial F region irregularity (EFI), and the ionospheric EIA. At low and equatorial latitudes, the CS in the E layer is dominated by the Es occurrence, while the CS in the F layer is mainly related to the EIA and EFI.…”

Section: Global Navigation Satellite System (Gnss) Related Issues Andmentioning

confidence: 99%

“…Top Row: MLT‐MLat variation of ionospheric irregularity represented by S 4 >0.3 (%); Bottom Row: the cycle slip occurrence rate per occultation (%) for different altitude intervals made by COSMIC during 2007–2011. AfterYue XA et al (2016a).…”

Section: Global Navigation Satellite System (Gnss) Related Issues Andmentioning

confidence: 99%

Chinese ionospheric investigations in 2016–2017

Liu

Wan

2018

Earth and Planetary Physics

View full text Add to dashboard Cite

After the release of the previous report to the Committee on Space Research (COSPAR) on progress achieved by Chinese scientists in ionospheric researches (Liu LB and Wan WX, 2016), in the recent two years (2016–2017) many interesting new investigations into various ionospheric related issues have been completed. In this report, about 100 publications are summarized. The topics highlighted are as follows: Ionospheric space weather, ionospheric dynamics, ionospheric climatology and modelling, ionospheric irregularity and scintillation, Global Navigation Satellite System (GNSS) related ionospheric issues and other techniques, and radio wave propagation in the ionosphere. An outstanding feature is that more and more observations from the Meridional Project supported the ionospheric investigations.

show abstract

Characterizing GPS radio occultation loss of lock due to ionospheric weather

Cited by 67 publications

References 53 publications

Climatology of GPS signal loss observed by Swarm satellites

Climatology of GPS signal loss observed by Swarm satellites

On the occurrence of F region irregularities over Haikou retrieved from COSMIC GPS radio occultation and ground‐based ionospheric scintillation monitor observations

Chinese ionospheric investigations in 2016–2017

Contact Info

Product

Resources

About