Showing papers in "Advances in Space Research in 2021"

TL;DR: Wang et al. as discussed by the authors described the scientific objectives and payloads of Tianwen-1, China's first exploration mission to Mars, which lifted off in July 2020 for a journey to Mars where it should arrive in February 2021.

TL;DR: In 2018, the 25th year of development of radar altimetry was celebrated and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences as discussed by the authors.

TL;DR: In this article, the authors investigate the contribution of six altimeter missions that have been placed into geodetic mapping phases for more than one year and compare the composite (all six altimeters) grids of east and north vertical deflection to matching grids where one altimeter has been omitted evaluate their contribution versus latitude.

TL;DR: In this article, a landslide susceptibility map (LSM) was generated considering the hybrid ensemble of machine learning approaches using different sample ratios Random Forest (RF) as the base classifier an ensemble with bagging, Rotation Forest (RTF), and Random Subspace (RS) Meta classifiers were used for spatial landslide modeling.

TL;DR: A novel adaptive fuzzy neural network (FNN) control scheme is proposed for the trajectory tracking control of an attitude-controlled free-flying space manipulator in the presence of output constraints and input nonlinearities.

TL;DR: The LightSail 2 mission as discussed by the authors is the culmination of a decade-long program sponsored by The Planetary Society to advance solar sailing technology, which demonstrated controlled solar sailing in Earth orbit using a CubeSat platform.

TL;DR: In this paper, the 3D inversion of aeromagnetic data was employed to imagine the depth and geometry of the magnetized ore bodies in the zones that identified by processing ASTER data.

TL;DR: A DME service volume model based on path loss between a pair of transmitting and receiving antennas has been proposed and results indicate about the necessity of actions for further development of global navigational aids network in order to guarantee safe airlines connections around the globe.

TL;DR: The feasibility of the Milani CubeSat mission is assessed and a preliminary solution to cover the operational mission profile of Milani in the close-proximity of Didymos system is provided.

TL;DR: In this article, the authors present results of contemporary coastal sea level changes along the coasts of Western Africa, obtained from a dedicated reprocessing of satellite altimetry data done in the context of the ESA ‘Climate Change Initiative’ sea level project.

TL;DR: In this article, the authors analyzed the scientific exploration tasks of CE-5 mission conducted on the lunar surface, and carried out the scientific payload system architecture design and individual scientific payload design with the scientific task requirements as the target, and proposed the working mode and main technical index requirements of the payloads.

TL;DR: In this paper, the authors used the multilayer perceptron neural network (MLP) as the base classifier and the hybrid ensemble machine learning methods i.e. Bagging and Dagging were used as the functional classifiers.

TL;DR: Based on Sentinel-1A SAR data, combined with the urban geological background, the ground deformation in Lanzhou New District (LZND) from 2017 to 2019 was analyzed as discussed by the authors.

TL;DR: An extensive review of gossamer space structure considering different categories of large deployable antennas, understanding the behaviour of thin membrane, their static and dynamic characteristics, wrinkling control, shape control, and recent advances in deployment techniques of large Deployable antenna structures are covered.

TL;DR: In this paper, a new coastal sea level product called X-TRACK/ALES is developed in order to support advances in coastal sea-level variability studies, which can extend the spatial coverage of sea level altimetry data up to 3.5 km in the land direction.

TL;DR: In this paper, the authors used three machine learning (ML) models including Self-Organization Map (SOM), Radial Basis Function Neural Network (RBFNN), and Multi-layers Perceptron (MLP) to produce flood susceptibility maps.

TL;DR: Experimental and analyses results show that the proposed algorithm has good performance in terms of high level of security, large enough key-space, tolerance to Single Event Upsets (SEU) as well as low time complexity.

TL;DR: In this paper, the authors present a review of the limitations and potentials of each sensor onboard the Sentinel-3 satellite and investigate the added value of using these three sensors co-located on the same platform for river discharge monitoring.

TL;DR: In this article, an integrated drought monitoring index (IDMI) was proposed as a tool to assess and monitor the spatio-temporal dynamics of agricultural drought during the northeast monsoon season for the period from 2000 to 2016 in Tamil Nadu state, south-eastern part of Indian peninsula.

TL;DR: The study identified the RF, SBC and ANFIS as the top three best performing models with comparable and promising SM estimation and SBC can be recommended as the best among all for SM estimation.

TL;DR: An adaptive neural network controller is developed by combining the trained network and a proportional-integral controller, and the long-standing challenge of model-based methods for control determination of unknown dynamics is resolved.

TL;DR: In this paper, active surface deformation, displacement pattern, and erosional variability are estimated using the geomorphologically sensitive morphometry along with the Persistent Scatterer Interferometric Synthetic Aperture Radar (PSInSAR) technique using the Sentinel-1Adata (119 images) acquired between 07- 02-2017 and 10-02-2021.

TL;DR: In this paper, the authors used Fast Fourier Transform (FFT) spectrum analysis and Nonlinear Least Square Fitting (NLSF) to calculate the vertical height from the antenna phase center to the reflection surface.

TL;DR: In this paper, real-time precise point positioning (PPP) is assessed and studied based on 8 days of PPP-B2b and GPS/GPS broadcast messages.

TL;DR: The architecture of the Global Short Message Communication system is proposed based on the medium earth orbit (MEO) constellation and the crosslinks of the global BeiDou navigation system (BDS-3) and preliminary results show that the requirements of Global Maritime Distress and Safety System (GMDSS) can be fulfilled.

TL;DR: A refined satellite non-gravitational force modeling strategy is constructed to reduce the amount of empirical parameters used to compensate for force modeling deficiencies, and suggests potential benefits to the space geodesy community that always pursues best-possible satellite orbits.

TL;DR: In this paper, the authors extend the high precision satellite altimetry record in both time and space by including independent data from the ERS1, ERS-2, Envisat and CryoSat-2 missions (ESA data).

TL;DR: The recently discovered first hyperbolic objects passing through the Solar System, 1I/Oumuamua and 2I/Borisov, have raised the question about near term missions to Interstellar Objects.

TL;DR: In this paper, Sea Level Anomaly (SLA) data from satellite altimetry is utilized to investigate the role of eddies on tropical cyclones intensification in the North Indian Ocean (NIO) basin.

TL;DR: In this paper, a total of 25 morphometric parameters were computed and several statistical analyses performed in establishing inter-correlation and classification of Indian rivers in Peninsular India were found 7th to 9th order catchments.