On the Occurrence of GPS Signal Amplitude Degradation for Receivers on Board LEO Satellites

Xiong, Chao; Xu, Jisheng; Stolle, Claudia; IJssel, José van den; Yin, Fan; Kervalishvili, Guram; Zangerl, Franz

doi:10.1029/2019sw002398

Cited by 14 publications

(24 citation statements)

References 44 publications

(58 reference statements)

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“…The regions highlighted in orange represent the years when Swarm is in-orbit. Such a long temporal coverage with Swarm measurements opens the opportunity to study the impact of solar activity on the ionosphere (Xiong et al, 2010) and to perform a long-term analysis of the ionospheric variations as well as multi-mission studies (Noja et al, 2013;Xiong et al, 2020). Here we discuss the data quality variation of Swarm LP measurements with respect to the last solar cycle.…”

Section: Baseline 05mentioning

confidence: 99%

Swarm Langmuir Probes' data quality and future improvements

Catapano¹,

Buchert

Qamili³

et al. 2021

Preprint

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Abstract. Swarm is ESA's (European Space Agency) first Earth observation constellation mission, which was launched in 2013 to study the geomagnetic field and its temporal evolution. Two Langmuir Probes (LPs) on board of each of the three Swarm satellites provide very accurate measurements of plasma parameters, which contribute to the the study of the ionospheric plasma dynamics. To maintain a high data quality for scientific and operational applications, the Swarm products are continuously monitored and validated via science-oriented diagnostics. This paper presents an overview of the data quality of the Swarm Langmuir Probes' measurements. The data quality is assessed by analysing short and long data segments, where the latter are selected sufficiently long to consider the impact of the solar activity. Langmuir Probes data have been validated through comparison with numerical models, other satellite missions, and ground observations. Based on the outcomes from quality control and validation activities conduced by ESA, as well as scientific analysis and feedback provided by the user community, the Swarm products are regularly upgraded. In this paper we discuss the data quality improvements introduced with the latest baseline, and how the data quality is influenced by the solar cycle. The main anomaly affecting the LP measurements is described, as well as possible improvements to be implemented in future baselines.

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Section: Baseline 05mentioning

confidence: 99%

Swarm Langmuir Probes' data quality and future improvements

Catapano¹,

Buchert

Qamili³

et al. 2021

Preprint

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“…The cause of ESF and EPBs can be explained in terms of Rayleigh-Taylor (R-T) instabilities [37] in the bottomside of the F-layer. Because these irregularities are associated with a wide range of scales and structures, the induced scintillations have a large impact on both satellite-satellite [38] and ground-satellite [38] radio links. Observations from the ground-based GNSS network revealed pulse-like Es disturbances in the mid-latitude TEC (Total Electron Content) enhancement [34], which appear as an elongate horizontal structure traveling like a front in the tropospheric weather system.…”

Section: Equatorial Plasma Bubbles (Epbs) and Equatorial Spread-f (Esf)mentioning

confidence: 99%

Section: Equatorial Plasma Bubbles (Epbs) and Equatorial Spread-f (Esf)mentioning

confidence: 99%

Ionospheric S4 Scintillations from GNSS Radio Occultation (RO) at Slant Path

2020

Remote Sensing

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Ionospheric scintillation can significantly degrade the performance and the usability of space-based communication and navigation signals. Characterization and prediction of ionospheric scintillation can be made from the Global Navigation Satellite System (GNSS) radio occultation (RO) technique using the measurement from a deep slant path where the RO tangent height (ht) is far below the ionospheric sources. In this study, the L–band S4 from the RO measurements at ht = 30 km is used to infer the amplitude scintillation on the ground. The analysis of global RO data at ht = 30 km shows that sporadic–E (Es), equatorial plasma bubbles (EPBs), and equatorial spread–F (ESF) produce most of the significant S4 enhancements, although the polar S4 is generally weak. The enhanced S4 is a strong function of local time and magnetic dip angle. The Es–induced daytime S4 tends to have a negative correlation with the solar cycle at low latitudes but a positive correlation at high latitudes. The nighttime S4 is dominated by a strong semiannual variation at low latitudes.

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“…Pitch-angle scattering can be due to the magnetic field curvature radius being close to the particle gyroradius (Sergeev and Tsyganenko, 1982) or to wave-particle interactions. For instance, lowerband chorus waves, often present in the morningside and dayside magnetosphere, can lead to energetic (E > 30 keV) electron precipitation (Thorne et al, 2010), whereas EMIC waves can be efficient in scattering kiloelectronvolt protons and megaelectronvolt electrons into the bounce loss cone (Rodger et al, 2008;Yahnin et al, 2009). Other suggested pitch-angle scattering waves include the plasmaspheric hiss, which may contribute to the precipitation of subrelativistic electrons (He et al, 2018).…”

Section: 7)mentioning

confidence: 99%

Lower-thermosphere–ionosphere (LTI) quantities: current status of measuring techniques and models

et al. 2021

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Abstract. The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and space above. The atmospheric part of the LTI is dominated by laws of continuum fluid dynamics and chemistry, while the ionosphere is a plasma system controlled by electromagnetic forces driven by the magnetosphere, the solar wind, as well as the wind dynamo. The LTI is hence a domain controlled by many different physical processes. However, systematic in situ measurements within this region are severely lacking, although the LTI is located only 80 to 200 km above the surface of our planet. This paper reviews the current state of the art in measuring the LTI, either in situ or by several different remote-sensing methods. We begin by outlining the open questions within the LTI requiring high-quality in situ measurements, before reviewing directly observable parameters and their most important derivatives. The motivation for this review has arisen from the recent retention of the Daedalus mission as one among three competing mission candidates within the European Space Agency (ESA) Earth Explorer 10 Programme. However, this paper intends to cover the LTI parameters such that it can be used as a background scientific reference for any mission targeting in situ observations of the LTI.

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On the Occurrence of GPS Signal Amplitude Degradation for Receivers on Board LEO Satellites

Cited by 14 publications

References 44 publications

Swarm Langmuir Probes' data quality and future improvements

Swarm Langmuir Probes' data quality and future improvements

Ionospheric S4 Scintillations from GNSS Radio Occultation (RO) at Slant Path

Lower-thermosphere–ionosphere (LTI) quantities: current status of measuring techniques and models

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