Advances in Space Research最新文献

{"title":"An improved multipath mitigation method using central hemispherical cell in precise point positioning","authors":"Wei Zhan,&nbsp;Xiufeng He,&nbsp;Haijun Yuan,&nbsp;Hao Yang,&nbsp;Jinwen Zeng,&nbsp;Dongzhen Jia","doi":"10.1016/j.asr.2024.11.048","DOIUrl":"10.1016/j.asr.2024.11.048","url":null,"abstract":"<div><div>Multipath errors can significantly impact the performance of precise point positioning (PPP). Previous studies popularly leverage the spatial repeatability of satellite orbits for multipath mitigation. The multipath hemispherical map (MHM) is a widely used discrete grid-based model. Besides, various refined methods such as multipath stacking (MPS) and trend-surface analysis (T-MHM) have been proposed to enhance the performance of the discrete grid-based model. This paper proposed an improved discrete grid-based model named multipath central grid (MCG) aimed at further utilizing the spatial correlation of multipath errors. Specifically, the modified method uses distance weighting to calculate the multipath correction of the target satellite adaptively. This paper systematically demonstrated the feasibility of the MCG for PPP. Simultaneously, some typical discrete grid-based models are tested for comparison. Tests were conducted for kinematic and static PPP using observations from two reservoirs with different observation environments. The results indicate differences between these refined models. Furthermore, both models can enhance performance, and the refined models T-MHM and MCG outperform the original MHM. In addition, the high-resolution congruent MCG model is recommended as one that can provide more robust results.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 2721-2738"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172097","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":"Transfers to Earth-Moon triangular libration points by Sun-perturbed dynamics","authors":"Lei Peng ,&nbsp;Yuying Liang ,&nbsp;Xingji He","doi":"10.1016/j.asr.2024.10.055","DOIUrl":"10.1016/j.asr.2024.10.055","url":null,"abstract":"<div><div>This paper is devoted to the construction of transfers to Earth-Moon triangular libration points based on their Sun-perturbed dynamics in the Sun-Earth-Moon system. In this bi-circular problem (BCP), the solar gravity perturbation breaks the stability of the Earth-Moon triangular libration points with three remaining periodic orbits (two stable and one unstable) around them as their dynamical substitutions. As the stable region, the invariant tori full of quasi-periodic orbits around the two stable periodic orbits can be used as the destination of triangular libration point transfers for a low station-keeping cost. However, the instability of the unstable periodic orbit is so mild that its stable and unstable manifolds are folded around the invariant tori surrounding the other two stable orbits. Thus, the authors approximate the stable and unstable manifolds of the unstable orbit through the parameterization method, which emerge from the Sun-perturbed Earth-Moon triangular libration points vicinity. They act as a bridge between outer space and the stable region around triangular libration points. First, the transfers connecting the Earth’s vicinity are constructed using the manifolds. Subsequently, a new connection mechanism near <em>L</em>₄ and <em>L</em>₅ based on the <em>N</em>:<em>M</em> multi-loop transfers is developed by extending the conventional patching skill to time-dependent situations. The quickest one is achieved by a 1:1 <em>L</em>₄-<em>L</em>₅ heteroclinic-based connection with a TOF of less than 26.9 days at a fuel cost of 117.88 m/s. Note that such Sun-perturbed transfers cannot be produced by continuing any trajectory in the Earth-Moon circular restricted three-body problem but they can generate two-impulsive transfers in the ephemeris model by continuation.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 2837-2855"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172101","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":"Study on the safe landing of a crew module considering horizontal velocity using a DEM-FEM coupling algorithm","authors":"Shaomin Liang ,&nbsp;Yuntian Feng ,&nbsp;Zhihua Wang","doi":"10.1016/j.asr.2024.11.029","DOIUrl":"10.1016/j.asr.2024.11.029","url":null,"abstract":"<div><div>Due to the influence of shallow wind and reverse thrust on the ground, the horizontal velocity of the crew module poses a threat to its safety during landing. To address this issue, the discrete element and finite element coupling algorithm is used to investigate the landing process of the crew module with horizontal velocity in this paper. Firstly, the discrete element model of the soil at the designated landing site and the finite element model of the crew module structure are established. Subsequently, the discrete element-finite element coupling algorithm of the interaction between the soil and the crew module is applied. The above model is used to analyze the influence of horizontal velocity on the crew module landing process in vertical and inclined landing. The results indicate that the horizontal velocity significantly affects the landing process of the crew module during vertical landing. Additionally, during inclined landing, the dynamic characteristics of the crew module are compared under three working conditions: the horizontal velocity direction is the same as the oblique direction of the crew module, the reverse direction and the vertical direction. When the horizontal velocity direction aligns with the oblique direction of the crew module, the influence of horizontal velocity on the landing process is relatively minor. However, when the horizontal velocity opposes the oblique direction of the crew module, it has a more substantial influence on the impact force and the displacement of the crew module. The research results provide valuable theoretical insights to ensure the safe landing of the crew module.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 3268-3283"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171229","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":"Revealing the synergistic contribution of PWV and CAPE to extreme precipitation throughout China","authors":"Yang Liu ,&nbsp;Xiao Yan ,&nbsp;Yibin Yao ,&nbsp;Bao Zhang ,&nbsp;Qingzhi Zhao ,&nbsp;Xiaoqing Wang ,&nbsp;Shenglong E ,&nbsp;Liang Zhang","doi":"10.1016/j.asr.2024.11.050","DOIUrl":"10.1016/j.asr.2024.11.050","url":null,"abstract":"<div><div>Precipitable water vapor (PWV) and convective available potential energy (CAPE) are two key variables affecting the formation and persistence of rainfall. Most previous studies only independently and qualitatively analyzed the long-term relationship between PWV/CAPE and extreme precipitation, but their synergistic contribution of PWV and CAPE to extreme precipitation (EP) was rarely investigated. Therefore, a novel model named PCEP (comprising PWV, CAPE, and EP), that integrates Global Navigation Satellite System (GNSS)-derived PWV and the fifth-generation ECMWF reanalysis (ERA5)-derived CAPE, is proposed in this study, where the joint contribution of PWV and CAPE on EP was investigated. Precipitation data is derived from the China Meteorological Administration (CMA). The daily PWV, CAPE and precipitation from 219 GNSS collocated meteorological stations in China from 2011 to 2018 were collected to perform the PCEP model. The tendency and periodic information of the three variables were revealed based on the multichannel singular spectral analysis and Lomb-scale methods. Moreover, the power-law relationships of PWV to log_e(EP) varied with the seasons in China, while the linear relationships existed between log_e(CAPE) and log_e(EP). Finally, to solve the collinearity issue among PWV, CAPE and EP that occurred on the regional scale, the partial least square (PLS) method was first introduced to investigate their relationships on the seasonal scale. The PLS method found that PWV and CAPE also complement each other to EP on the seasonal scale, on the basis of regional complementarity. Additionally, the qualitative relationship between PWV, CAPE and the frequency of EP was elucidated. These results showed that the close relationships between high PWV and CAPE and the intensity and frequency of EP events on the annual and seasonal scales throughout China.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 2739-2752"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172096","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":"A non-singular predefined-time sliding mode tracking control for space manipulators","authors":"Yuxin Yan ,&nbsp;Hutao Cui ,&nbsp;Peng Han","doi":"10.1016/j.asr.2024.11.042","DOIUrl":"10.1016/j.asr.2024.11.042","url":null,"abstract":"<div><div>This research presents a predefined-time control strategy for the trajectory tracking of a space manipulator subjected to parametric uncertainty and time-varying disturbance. Firstly, a nonlinear disturbance observer with predefined time convergence is constructed to achieve accurate estimation of the lumped disturbance without requiring any prior information. Subsequently, a unique predefined-time terminal sliding surface containing arctan function is proposed, which avoids the singularity problem that exists in traditional terminal sliding surfaces. Afterwards, a novel robust terminal sliding mode control law is designed based on the estimated knowledge. The developed controller ensures the predefined time stability of the closed-loop system, and the convergence time’s upper bound can be explicitly defined in advance through two specific parameters for any initial conditions. Finally, numerical simulations and comparative tests verify the effectiveness and superiority of the suggested controller.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 3284-3297"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171080","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":"Numerical investigation of prediction method for propagation delay of low-frequency radio signal based on the Changhe-II and Loran-C navigation system in East Asia","authors":"Jian Wang ,&nbsp;Chengsong Duan ,&nbsp;Cheng Yang ,&nbsp;Qiao Yu","doi":"10.1016/j.asr.2024.11.036","DOIUrl":"10.1016/j.asr.2024.11.036","url":null,"abstract":"<div><div>As an important part of low-frequency communication research, the “Changhe-II” and Loran-C navigation systems have been integral to long-distance radio communication since their inception, being widely used for positioning, navigation, and timing. This paper analyzes data from the “Changhe-II” South China Sea chain to Xinxiang and Qingdao, as well as the Loran-C Northwest Pacific chain to Wuchang, Xinxiang, and Qingdao, using the wave-hop theory to study methods for predicting low-frequency sky wave propagation delays. The results demonstrate that the wave-hop theory can provide highly accurate predictions of low-frequency sky wave propagation delays in East Asia, with an average RMSE of less than 2 μs. Furthermore, the predictive performance, evaluated across both temporal and spatial dimensions, is influenced by factors such as propagation links and seasonal variations. The results of this paper are of significant reference value for optimizing the design of low-frequency navigation systems, ultimately supporting more extensive and accurate navigation services.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 3220-3229"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171231","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 debris propagation dynamics and spacecraft survivability risks in venus synchronous and high-altitude mission orbits","authors":"Robert A. Bettinger,&nbsp;Alexander M. Petrocelli,&nbsp;Nicholas Reid,&nbsp;Wade Lawrie,&nbsp;Nathan R. Boone","doi":"10.1016/j.asr.2024.11.044","DOIUrl":"10.1016/j.asr.2024.11.044","url":null,"abstract":"<div><div>Venus’ slow axial rotation, equivalent to 243 Earth days, creates a unique astrodynamical occurrence: Venus synchronous orbit is located outside the planet’s gravitational sphere of influence (SOI). With Venus synchronous orbit now defined in terms of the wider Sun-Venus system, a dynamical model such as the Circular Restricted Three-Body Problem (CR3BP) must be used to model the trajectory. As Venusian exploration increases over the next few decades, synchronous orbit may become a lucrative orbital regime for hosting mission sets related to planetary and climate science, communications relay, or end-of-life vehicle disposal. As a result of increased spacecraft traffic, the likelihood of a debris-generating event in Venus synchronous orbit becomes non-negligible and a realistic problem for other missions operating in Venusian space. This paper, for the first time in literature, investigates the debris propagation dynamics associated with a catastrophic spacecraft breakup occurring in and near Venus synchronous orbit, as well as the orbit for Akatsuki, a current Japanese orbiter featuring the greatest semi-major axis of any mission yet flown around Venus. Using Monte Carlo analysis of debris motion near the boundaries of the Venusian SOI, this paper enables an improved understanding of the potential collision risks posed by debris near Venus and enhance operational planning for future Venus space missions. Overall, this paper finds that the maximum probability of hazard for a bystander spacecraft is on the order of 1 × 10⁻⁸% to 1 × 10⁻¹¹% based on different initial angular positions between the bystander and breakup spacecraft.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 3025-3049"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171234","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":"A spatially explicit multi-hazard framework for assessing flood, landslide, wildfire, and drought susceptibilities","authors":"Bahram Choubin ,&nbsp;Abolfazl Jaafari ,&nbsp;Davood Mafi-Gholami","doi":"10.1016/j.asr.2024.11.005","DOIUrl":"10.1016/j.asr.2024.11.005","url":null,"abstract":"<div><div>Sustainable development goals require evaluating vulnerabilities and examining natural and climatic hazards for effective planning that reduces their impact on economic, social, and developmental efforts. Key hazards like floods, landslides, wildfires, and droughts have significantly affected terrestrial ecosystems and human societies, emphasizing the importance of comprehending these hazards. This study aimed to predict and spatially map multi-hazard, identifying historical and potential risks to inform sustainable development and construction programs that mitigate risks and promote resilience. A 34-year drought magnitude map was generated using long-term data, and ensemble and individual machine learning techniques were used to produce maps of flood, landslide, and wildfire hazards in a northwest region of Iran. Results demonstrated that ensemble learning models outperformed individual models, with the top-performing models being the weighted average (WA) of the two best models, random forest, extreme gradient boosting, WA models with over 80% accuracy, and WA incorporating all models, respectively. The CART model performed best among individual models. Variable importance analysis revealed that slope and precipitation were crucial factors for identifying high-hazard landslide areas, distance from waterways, vegetation cover, and topographic humidity index emerged as the most crucial factor for identifying flood hazard areas, while vegetation, rainfall, and proximity to roads significantly impacted wildfire hazard. The multi-hazard map produced by our study indicated that about 30% of the study area was highly and very highly susceptible to floods, landslides, wildfires, and droughts and the hazards mitigation efforts should be primarily directed to these specific portions of the study area. Our study underscored the importance of integrating long-term data and machine learning techniques in multi-hazard prediction and mapping, ultimately guiding mitigation efforts and promoting resilience in the face of natural and climatic hazards.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 2569-2583"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171692","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":"Advanced machine vision techniques for groundwater level prediction modeling geospatial and statistical research","authors":"Dai Xianglin ,&nbsp;Aqil Tariq ,&nbsp;Ahsan Jamil ,&nbsp;Rana Waqar Aslam ,&nbsp;Zeeshan Zafar ,&nbsp;Nadjem Bailek ,&nbsp;Mohamed Zhran ,&nbsp;Khalid F. Almutairi ,&nbsp;Walid Soufan","doi":"10.1016/j.asr.2024.11.018","DOIUrl":"10.1016/j.asr.2024.11.018","url":null,"abstract":"<div><div>This study utilizes three models, namely Weight of Evidence (WOE), Frequency Ratio (FR), and Index of Vulnerability (IV), to identify groundwater potential zones (GWPZ) in southern Khyber Pakhtunkhwa, Nowshera District, Pakistan. We incorporated a total of twelve variables, encompassing elevation, slope, distance to the rivers, rainfall, curvature, drainage density, land use/land cover, topographic wetness index, height above the nearest drainage, NDVI, distance to the roads, and soil type, utilizing ArcGIS 10.8. The AUROC (Area Under the Receiver Operating Characteristic) assessed the dependability of the models. GWPZ was categorized into five classifications: very low, low, moderate, high, and very high. The WOE model produced distributions of 10.14 % (262.09 km²), 19.58 % (506.00 km²), 26.75 % (691.10 km²), 27.10 % (700.18 km²), and 16.40 % (423.75 km²) respectively. The FR yielded 20.93 % (538.90 km²), 32.38 % (833.53 km²), 18.92 % (487.14 km²), 13.13 % (337.94 km²), and 14.61 % (376.07 km²). The IV model resulted in 14.41 % (372.46 km²), 17.17 % (443.67 km²), 29.01 % (749.52 km²), 25.85 % (667.97 km²), and 13.53 % (349.50 km²). The AUC-ROC for WOE, FR, and IV were 58.06%, 87.53%, and 84.98%, respectively. All models accurately defined the GWPZ, with the FR approach demonstrating notable potential. These findings provide vital information for managing groundwater resources and the design of metropolitan areas. Our developed methodology can be used in places with comparable characteristics. It is a valuable tool for policymakers interested in sustainable groundwater management.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 2652-2668"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171693","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":"Robust proximity rendezvous and coordinated control of space robots","authors":"Kai Gong","doi":"10.1016/j.asr.2024.10.058","DOIUrl":"10.1016/j.asr.2024.10.058","url":null,"abstract":"<div><div>This paper investigates the robust proximity rendezvous and coordinated control of space robots. A robust rendezvous controller is meticulously devised to guarantee the <span><math><mrow><msub><mrow><mi>H</mi></mrow><mrow><mi>∞</mi></mrow></msub></mrow></math></span> performance of space rendezvous mission by addressing the Hamilton–Jacobi–Isaacs inequality. Additionally, a virtual control system is formulated to guarantee that the robust control inputs adhere to saturation constraints. Furthermore, this study introduces a novel fixed-time convergence constraint function aimed at constraining coordinated tracking missions for end-effector. The proposed coordinated controller ensures the achievement of end-effector pose tracking within a predetermined fixed time, while concurrently stabilizing the base attitude and bounding the transient responses of tracking errors within user-defined ranges. Notably, all these accomplishments are demonstrated under conditions of parameter uncertainty and input disturbance. Simulation results validate the effectiveness of the proposed control scheme.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 3","pages":"Pages 2856-2873"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172102","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}