Satellite Navigation for Digital Earth

Shi, Chuang; Wei, Na

doi:10.1007/978-981-32-9915-3_4

Cited by 6 publications

(9 citation statements)

References 2 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Before the advent of man-made satellites, navigation and positioning mainly depended on ground-based radio navigation systems that were developed during the World War II (Shi and Wei, 2020). In the 1950s and 1960s, the USSR and the USA managed to realize three satellite navigation and positioning systems based on the Doppler shift of a radio signal.…”

Section: Global Navigation Satellite Systems (Gnss)mentioning

confidence: 99%

“…These 'Doppler shift-based' positioning systems needed long-term observations to realize navigation and positioning and the positioning accuracy was also unsatisfactory. To overcome these limitations, the joint development in the early 1970s of a new US satellite navigation system, the GPS (Global Positioning System), opened a new chapter for the development of satellite navigation systems (Shi and Wei, 2020;Kaplan and Hegarty, 2006;El Rabbany, 2002). GPS is fully operational nowadays and provides accurate, continuous, worldwide, three-dimensional position, and velocity information to users with the appropriate receiving equipment (Kaplan and Hegarty, 2006).…”

Section: Global Navigation Satellite Systems (Gnss)mentioning

confidence: 99%

“…Since then, many countries in the world have begun to develop independent GNSS (Global Navigation Satellite Systems). GNSSs have evolved from a single GPS constellation to multiple GNSS constellations and in the coming decades, the number of navigation satellites in orbit may increase to several hundred (Shi and Wei, 2020).…”

Section: Global Navigation Satellite Systems (Gnss)mentioning

confidence: 99%

See 2 more Smart Citations

Drones and Geographical Information Technologies in Agroecology and Organic Farming Contributions to Technological Sovereignty

M¹,

Diantini²,

Pappalardo³

2022

View full text Add to dashboard Cite

The United Nations decade of ecosystem restoration (2021)(2022)(2023)(2024)(2025)(2026)(2027)(2028)(2029)(2030), the Glashow Climate Pact (November 2021) reaffirms the role of Nature Based Solutions in the fight against climate change and in building shared adaptation solutions. The Glashow Climate Pact highlights the importance of ensuring the integrity of all ecosystems, the protection of biodiversity "recognized by some cultures as Mother Earth, the importance for some of the concept of 'climate justice', when taking action to address climate change".In April 2020 Boaventura de Souza Santos published the "Cruel Pedagogy of Virus" focusing on how the COVID pandemic/syndemic has arrived at the end of six decades of uneven development and highlights the global predatory capitalism and patriarchy embodied in many development discourses, consolidating social exclusion, resource extraction, human and nature domination, environmental injustice, and accumulation by dispossession.Deconstructing development, sustainable development, sustainable growth asks for recognizing practices of critical development, alternative development, alternatives to development, post-development to embrace what Max-Neef called "the development at human scale".Change starts from new practices, challenging the menu of globalizing universalizing development theories and initiatives to inhabit pluriverses of words and worlds.Agroecology, as young science that is about to turn a century, can contribute in various ways to the current challenges of facing environmental and climate emergency, halting biodiversity loss, pursuing just food systems.The indigenous, peasant, and environmental movements of active citizenship, inspired by agroecology, promote food sovereignty, just food systems, the collaboration between food producers and consumers, the renewed alliance between natural, agricultural and urban ecosystems, technological sovereignty, innovation attentive to human rights.This book explores the challenges posed by the new geographic information technologies in agroecology and organic farming. It discusses the differences among technology-laden conventional farming systems and the role of technologies in strengthening the potential of agroecology and organic farming. In conventional thinking, the use of new technologies is an almost exclusive domain vi Preface

show abstract

Section: Global Navigation Satellite Systems (Gnss)mentioning

confidence: 99%

Section: Global Navigation Satellite Systems (Gnss)mentioning

confidence: 99%

Section: Global Navigation Satellite Systems (Gnss)mentioning

confidence: 99%

See 1 more Smart Citation

Drones and Geographical Information Technologies in Agroecology and Organic Farming Contributions to Technological Sovereignty

M¹,

Diantini²,

Pappalardo³

2022

View full text Add to dashboard Cite

show abstract

“…The temporal resolution of the global TEC data was 5 min. More detailed information, system architecture and operating concept about the GDGPS system can be found at https://iono.jpl.nasa.gov/latest_rti_global.html and in several previous publications (Bertiger et al, 1997;Hernández-Pajares et al, 2009;Guo et al, 2015;Ren et al, 2016;Shi and Wei, 2020).…”

Section: Source Datamentioning

confidence: 99%

Generalized Two-Dimensional Principal Component Analysis and Two Artificial Neural Networks to Detect Traveling Ionospheric Disturbances Using the Tsunami-Atmosphere-Ionosphere Coupling Mechanism

Lin

2021

Preprint

View full text Add to dashboard Cite

A weak tsunami was induced by the 2016 Mw = 7.8 Sumatra earthquake, which occurred at 12:49 on March 2, 2016 (UTC). The epicenter was at 5.060°S, 94.170°E at a depth of 10 km. At 15.02 on March 2 (UTC), the weak tsunami (amplitude: 0.11 m) arrived at the station located at 10.40°S, 105.67°E. The largest first principal eigenvalue derived using the bilateral projection-based two-dimensional principal component analysis (B2DPCA) indicated a spatial traveling ionospheric disturbance (TID), which was caused by internal gravity waves (IGWs), at 13:20 on March 2 (UTC). The largest second principal eigenvalue represented another TID expanding to the southwest. The two largest principal eigenvalues were associated with the TIDs, which were also determined using two back-propagation neural network (BPNN) models and two convolutional neural network (CNN) models, called the BPNN-B2DPCA and CNN-B2DPCA methods, respectively. These two methods yielded the same results as the B2DPCA. Therefore, the robustness and reliability of the B2DPCA were validated.

show abstract

“…Kalman filter, even though it was developed originally for tracking targets such as aircrafts [3], today has found applications in many research areas in engineering and signal processing [7] such as speech recognition [23], tomography [51,17], hydrology [14] and econometrics [54] to name but a few. The Earth's ionospheric weather, affected by the solar activity, is a purely dynamic system whose turbulence has a significant impact on navigation, positioning and satellite communication systems that are an integral part of many human activities [44,8]. Either Empirical [10] or physical-based models (e.g.…”

Section: Introductionmentioning

confidence: 99%

Real-time Ionospheric Imaging of S4 Scintillation from Limited Data with Parallel Kalman Filters and Smoothness

Koulouri

2021

Preprint

View full text Add to dashboard Cite

In this paper, we propose a Bayesian framework to create two dimensional ionospheric images of high spatio-temporal resolution to monitor ionospheric irregularities as measured by the S4 index. Here, we recast the standard Bayesian recursive filtering for a linear Gaussian state-space model, also referred to as the Kalman filter, first by augmenting the (pierce point) observation model with connectivity information stemming from the insight and assumptions/standard modeling about the spatial distribution of the scintillation activity on the ionospheric shell at 350 km altitude. Thus, we achieve to handle the limited spatiotemporal observations. Then, by introducing a set of Kalman filters running in parallel, we mitigate the uncertainty related to a tuning parameter of the proposed augmented model. The output images are a weighted average of the state estimates of the individual filters. We demonstrate our approach by rendering two dimensional real-time ionospheric images of S4 amplitude scintillation at 350 km over South America with temporal resolution of one minute. Furthermore, we employ extra S4 data that was not used in producing these ionospheric images, to check and verify the ability of our images to predict this extra data in particular ionospheric pierce points. Our results show that in areas with a network of ground receivers with a relatively good coverage (e.g. within a couple of kilometers distance) the produced images can provide reliable real-time results. Our proposed algorithmic framework can be readily used to visualize real-time ionospheric images taking as inputs the available scintillation data provided from freely available web-servers.

show abstract

Satellite Navigation for Digital Earth

Cited by 6 publications

References 2 publications

Drones and Geographical Information Technologies in Agroecology and Organic Farming Contributions to Technological Sovereignty

Drones and Geographical Information Technologies in Agroecology and Organic Farming Contributions to Technological Sovereignty

Generalized Two-Dimensional Principal Component Analysis and Two Artificial Neural Networks to Detect Traveling Ionospheric Disturbances Using the Tsunami-Atmosphere-Ionosphere Coupling Mechanism

Real-time Ionospheric Imaging of S4 Scintillation from Limited Data with Parallel Kalman Filters and Smoothness

Contact Info

Product

Resources

About