Advances in Space Research最新文献

{"title":"A lightweight prediction model for global ionospheric total electron content based on attention-BiLSTM","authors":"Chao Han ,&nbsp;Yaping Guo ,&nbsp;Ming Ou ,&nbsp;Dandan Wang ,&nbsp;Chenglong Song ,&nbsp;Ruimin Jin ,&nbsp;Weimin Zhen ,&nbsp;Peirui Bai ,&nbsp;Xiaorui Chong ,&nbsp;Xiaoni Wang","doi":"10.1016/j.asr.2024.11.066","DOIUrl":"10.1016/j.asr.2024.11.066","url":null,"abstract":"<div><div>The ionospheric total electron content (TEC) is a critical parameter for space weather and Global Navigation Satellite System (GNSS) applications. A Bidirectional Long Short-Term Memory neural network model with an added attention mechanism (BiLSTM-Attention) was developed in this study to predict 256 spherical harmonic coefficients (SHC). Input data for the forecasting model includes F10.7, Dst, and other feature parameters, along with a lightweight historical time series of SHC from the past day. The model output is the next day’s SHC. Then, we compare the results of SHC with those of the 1-day Center for Orbit Determination in Europe (CODE) prediction model. The correlation coefficient form model TEC with respect to the CODE TEC are 0.93 and 0.96 in 2018 and 2022, respectively, while the correlation coefficient of the 1-day CODE prediction model are 0.91 and 0.94. The results illustrate established model both in high and low solar activity years, and exhibiting enhanced robustness during geomagnetic storms. Furthermore, typical ionospheric structures such as Equatorial Ionization Anomaly (EIA) is well reproduced in the TEC prediction maps. Compared to C1PG, the proposed model offers a lighter computational load while maintaining competitive performance in global TEC prediction.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3614-3629"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of deployment controllers for space tethered system","authors":"Aaron Aw Teik Hong ,&nbsp;Renuganth Varatharajoo ,&nbsp;Yew-Chung Chak","doi":"10.1016/j.asr.2024.11.061","DOIUrl":"10.1016/j.asr.2024.11.061","url":null,"abstract":"<div><div>This review article investigates the performance of newly designed controllers for Tethered Space Systems (TSS) deployment, comparing them to past and current research. Specifically, the study delves into the PD type controller, known for its simplicity and early development. While PD controllers adequately manage non-coplanar scenarios with external perturbations, they are limited to linearized cases. In contrast, advanced controllers like Sliding Mode Control (SMC) effectively handle TSS’s highly nonlinear dynamics due to their robust nature. The study introduces a sigma function, derived from Djebli’s literature, to regulate tether deployment rate and length across all controllers. Simulation results demonstrate the feasibility of controlling out-of-plane libration angles solely through the tether tension. Among the controllers tested, the advanced sigma-SMC exhibits superior accuracy during deployment, while the modified SMC deploys the tether fastest albeit with significant steady-state errors and deflection angles. Numerical results show that the original SMC controller performs well as the most fuel-efficient option. This comparison focuses solely on tether deployment with J2 and gravity-gradient perturbations, offering a foundation for further exploration into TSS missions, including factors like aerodynamic drag, solar radiation, third body perturbations, tether flexibility, and retrieval phase control, tailored to specific mission requirements.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3933-3949"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maximization of fundamental frequency for small satellite components layout design","authors":"Wei Cong,&nbsp;Bingxiao Du,&nbsp;Yong Zhao","doi":"10.1016/j.asr.2024.11.079","DOIUrl":"10.1016/j.asr.2024.11.079","url":null,"abstract":"<div><div>This paper proposes a bi-objective optimization method for the small satellite components layout optimization design, considering mass characteristics and fundamental frequency characteristics. Firstly, <span><math><mrow><mi>φ</mi></mrow></math></span> function is used to describe the geometry and position relationships between components, effectively addressing the non-overlap constraints among them. Then, the finite element method is used to calculate the stiffness and mass of the satellite load-bearing board to determine the fundamental frequency of the satellite. In addition, the paper designs a novel bi-objective optimization algorithm combined Diverse Gradient Optimization (DGO) algorithm with the Smart Normal Constraint (SNC) method, which simplifies the complex gradient calculation through semi-analytical sensitivity analysis. Finally, numerical examples validate the applicability and rationality of the proposed optimization method in solving bi-objective satellite components layout problems. The results show that the method can provide effective solutions for the layout design of small satellite components while considering both mass characteristics and fundamental frequency characteristics optimization.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3967-3981"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Doppler velocity estimation based on the random sample consensus considering a prior dynamic model","authors":"Jing Guo,&nbsp;Ziyu Fan,&nbsp;Zhen Li,&nbsp;Qile Zhao","doi":"10.1016/j.asr.2024.12.027","DOIUrl":"10.1016/j.asr.2024.12.027","url":null,"abstract":"<div><div>Typically, centimeters per second (cm/s) accuracy can be achieved for velocity estimation based on time-differenced positioning, Doppler velocity, and the time-differenced carrier phase approach in open air conditions. However, velocity estimation performance can deteriorate due to non-line-of-sight (NLOS) signals, multipath effects, and other sources of interference in urban areas. We discuss a velocity estimation method based on the RANdom SAmple Consensus (RANSAC) algorithm and a prior dynamic model is proposed. RANSAC is used to isolate the observations affected by NLOS or multipath, while a prior dynamic model is implemented to provide proper velocity constraint. Vehicle kinematic experiments conducted in both open and complex urban environments demonstrate that the velocity accuracy in all three directions can be improved by over 40 % and centimeter-level velocity accuracy can be obtained in open areas. Moreover, the accuracy can be improved by 78.5 %, 78.5 %, and 68.4 % in the north, east, and up directions compared to that obtained by traditional single-point Doppler velocity, and 10.5 cm/s, 11.0 cm/s, and 14.3 cm/s accuracies are achieved in complex urban areas. Moreover, this method is also reasonably applicable to low-cost receivers.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3471-3485"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the effects of different data classification methods on landslide susceptibility mapping","authors":"Halil Akinci,&nbsp;Ayse Yavuz Ozalp","doi":"10.1016/j.asr.2024.12.020","DOIUrl":"10.1016/j.asr.2024.12.020","url":null,"abstract":"<div><div>In this study, landslide susceptibility maps (LSMs) were produced for three regions where landslides are common in the Eastern Black Sea Region of Türkiye. The regions studied include the districts of Trabzon, Rize and Artvin. The eXtreme Gradient Boosting (XGBoost) machine learning algorithm was used to generate the LSMs. Ten different factors that can affect landslides including lithology, land cover, topographic wetness index (TWI), plan and profile curvature, slope, elevation, aspect, distance to roads and drainages were used for the research. The study tested various spatial data classification methods for these factors. Specifically, the data was categorized using five distinct classification methods: “geometric interval,” “equal interval,” “manual interval,” “natural breaks,” and “quantile.” The main objective of the study was to see how these classification methods affect the accuracy of LSMs. For this purpose, six different models using the XGBoost algorithm were created. In the first model, continuous data was used for most of the factors, while some factors (aspect, land cover and lithology) were used as discrete data. The other five models categorized the data using the different classification methods mentioned above. The receiver operating characteristic (ROC) curve and area under the curve (AUC) approach were used to measure how well each model performed. The results showed that the Model_1 using mostly continuous data performed the best among all three study areas with the highest AUC value. The model with the lowest AUC value was the model using the equal interval classification method (Model_3). The most important finding gained from this study was that when producing LSMs, it is preferable to maintain continuous data as is rather than reclassifying it, as this improves the accuracy of the susceptibility model.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3427-3450"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility of orbital capture of near-earth asteroids based on the planar-circular restricted three-body problem","authors":"Yamaguchi Kohei ,&nbsp;Gu Xinbo ,&nbsp;Inamori Takaya ,&nbsp;Park Ji-Hyun ,&nbsp;Taguchi Masaya","doi":"10.1016/j.asr.2024.11.030","DOIUrl":"10.1016/j.asr.2024.11.030","url":null,"abstract":"<div><div>With the goal of efficiently extracting samples or even materials from the surface of an asteroid, this study proposed and investigated a method to change the velocity vector of a near-Earth asteroid and place it into an orbit where it is captured by the Earth’s gravitational field. The change in the orbit of an asteroid is not directly discussed in relation to the change in the velocity vector but is indirectly considered by the change in the Jacobi integral, which is the first integral of the circular-planar restricted three-body problem. In addition, the distribution of the smaller alignment index (SALI) is investigated to find a capture point where the asteroid is not put into a chaotic orbit. The proposed method is numerically demonstrated for fictional asteroid capture missions. The results show that several asteroids can be put into stable captured orbits. Additionally, we propose a method to optimize the value of the Jacobi integral, aiming to stabilize periodic captured orbits. Numerical integration confirms that when the Jacobi integral is optimized, the orbital lifetime of the captured orbit exceeds 500 years.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3806-3819"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finite-horizon approximate optimal attitude control based on adaptive dynamic programming for ultra-low-orbit satellite","authors":"Jiahong Ma,&nbsp;Baolin Wu,&nbsp;Yunhai Geng,&nbsp;Menglei Wang","doi":"10.1016/j.asr.2024.11.073","DOIUrl":"10.1016/j.asr.2024.11.073","url":null,"abstract":"<div><div>This study investigates the finite-horizon approximate optimal attitude control problem for ultra-low-orbit satellites, addressing the complexities introduced by substantial disturbance, actuator faults, actuator saturation, and time constraint. Initially, a fixed-time concurrent learning fault and disturbance estimation approach is proposed that relieves persistent excitation constraints and isolates different influences individually. Subsequently, the cost function is designed with actuator fault estimation, ensuring that the control strategy consistently adheres to actuator saturation constraints and can compensate for current faults. Furthermore, based on the adaptive dynamic programming, an approximate optimal attitude control approach is proposed, which employs time-varying activation functions to approximate the optimal cost function. A fixed-time neural network weight adaptation strategy is designed to ensure the precision and reliability of the approximation. Finally, the numerical simulation confirms the validity and practical applicability of the proposed approach in satellite attitude control systems.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3856-3869"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An empirical model of the thermospheric winds based on ICON/MIGHTI observations","authors":"Rongjin Du ,&nbsp;Ruilong Zhang ,&nbsp;Libo Liu ,&nbsp;Wendong Liu ,&nbsp;Wenbo Li ,&nbsp;Yuyan Yang ,&nbsp;Han Ma ,&nbsp;Huijun Le ,&nbsp;Yiding Chen","doi":"10.1016/j.asr.2024.12.018","DOIUrl":"10.1016/j.asr.2024.12.018","url":null,"abstract":"<div><div>It is crucial to accurately reproduce the climatological features of the thermospheric neutral winds. We used the 2020–2022 data of the Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI) on the Ionospheric Connection Explorer (ICON) to develop an empirical model of thermospheric winds with the methods of the Non-Uniform Rational B-Spline and harmonic fittings (NURBS-Harmonic model). The NURBS-Harmonic model exhibits good adaptability for winds in every season with longitude, latitude, local time, and altitude. Over 70 % of the NURBS-Harmonic data are present with errors within 15 m/s, showing a better performance than the Horizontal Wind Model (HWM14). The percentage of HMW14 data errors within 15 m/s is about 40 %. The NURBS-Harmonic effectively captures the spatial structure of the wind fields and exhibits seasonal variations well. At 250 km, zonal winds in the low and middle latitudes at 12 LT exhibit a wavenumber-3 (WN3) structure in all the seasons, while they display a slight wavenumber-4 (WN4) longitude structure trend during June Solstice and September Equinox. Meridional winds at the same altitude show a distinct WN4 structure in every season. Different from the HWM14, which only includes migrating tides, the NURBS-Harmonic model also considers non-migrating tidal components. To validate the significance of non-migrating tides, we conducted a wave analysis on meridional winds at 250 km in September Equinox near the equator where non-migrating tides are relatively important. The analysis indicates that the amplitudes of the predominant non-migrating tidal components (SE2, DW2, and D0) are nearly equal and about 40 % of the dominant migrating tidal component DW1. This suggests that the non-migrating tidal components can contribute significantly to the overall wind field variability and should not be overlooked. In addition, the extensive height coverage from 91 km to 300 km of the MIGHTI data enables the model to provide precise altitude information. The zonal WN4 structure of zonal winds is most prominent in the altitude ranges of 100–250 km at low latitudes in the Northern Hemisphere during June Solstice and September Equinox. The model accurately reflects the phases variations of the winds at various altitudes. The phases of WN3 and WN4 at 110 km are opposite to those at 150 km, existing in all seasons. This may partially explain previous reports that the topside ionosphere equatorial vertical plasma drift is positively correlated with the zonal winds at 110 km and inversely correlated with those at 150 km.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3730-3742"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions over the East African longitudinal sector in 2015","authors":"Zerihun Alemu ,&nbsp;Tsegaye Kassa","doi":"10.1016/j.asr.2024.12.012","DOIUrl":"10.1016/j.asr.2024.12.012","url":null,"abstract":"<div><div>In this paper, we investigated the behavior of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions in the year 2015. Total Electron Content (TEC) data was obtained from four Global Navigation Satellite System (GNSS) receivers situated at Addis Ababa (ADIS), Bahir Dar (BDMT), ASAB (ASAB), and Debark (DEBK). We used Rate of TEC change index (ROTI) to describe ionospheric irregularities associated with plasma bubbles. The monthly occurrence rates (MOR) is obtained to be higher in equinoctial and lower in solstitial months at all stations. Moreover, the seasonal occurrence rates of plasma bubbles (SOR) show equinoctial and solstitial asymmetries. The seasonal occurrence rate in March equinox is higher than that of the September equinox during both quiet and disturbed geomagnetic conditions. Similarly, higher occurrence rate is observed in June than December solstice in quiet geomagnetic conditions. We have also investigated that the occurrence rate of plasma bubble is higher in geomagnetic quiet conditions than disturbed conditions at all stations. Moreover, there is also excellent correlation with high degree of significance between the monthly occurrence rates of plasma bubbles and the monthly mean F10.7 index and sunspot number at all stations. The occurrence times of plasma bubbles are almost similar in the four stations and most of the irregularities (around 95 <span><math><mrow><mo>%</mo></mrow></math></span>of the total irregularities) are observed in times between postsunset and midnight hours. The daily, monthly, and seasonal variations of ROTI also demonstrate similarity with the variation of the occurrence rates of plasma bubbles.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3671-3691"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The path-tracing simulation of light-field camera system: SurfCam/GrainCams for lunar surface exploration","authors":"Minbae Kim ,&nbsp;Minsup Jeong ,&nbsp;Mingyeong Lee ,&nbsp;Jihun Kim ,&nbsp;Young-Jun Choi ,&nbsp;Sungsoo S. Kim ,&nbsp;Hae-Gon Jeon ,&nbsp;Jisu Shin","doi":"10.1016/j.asr.2024.12.029","DOIUrl":"10.1016/j.asr.2024.12.029","url":null,"abstract":"<div><div>The SurfCam is being developed to understand the microscopic lunar surface structures known as the fairy castle structure, composed of grains with an average size of a few tens of microns. It is designed as a microscopic light-field camera (LFC) and is one of the camera instrument packages in GrainCams, a candidate payload for NASA’s Commercial Lunar Payload Services (NASA/CLPS). The light-field camera system allows for obtaining depth maps and 3D images of lunar surface structures on a scale of tens of microns by capturing a 4D light field. This camera system can be achieved by adding a microlens array (MLA) between the main optics and the sensor in a typical camera system. The Cycles render engine, a physically-based path-tracing (one of the ray-tracing types) renderer of Blender 3D software, helps to simulate realistic light-field images. We performed path-tracing simulations by configuring SurfCam’s optics and creating test objects to confirm depth estimation results in Blender 3D. In this study, we present the results of simulated images and analyze them based on the current design of the SurfCam.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 4050-4060"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}