Journal of Astronomy and Space Sciences最新文献

筛选
英文 中文
Electromagnetic Electron-Cyclotron Wave for Ring Distribution with Alternating Current (AC) Electric Field in Saturn Magnetosphere 土星磁层交流电场环形分布的电磁电子回旋波
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2022-06-01 DOI: 10.5140/jass.2022.39.2.35
Annex Edappattu Haridas, S. Kanwar, R. S. Pandey
{"title":"Electromagnetic Electron-Cyclotron Wave for Ring Distribution with Alternating\u0000 Current (AC) Electric Field in Saturn Magnetosphere","authors":"Annex Edappattu Haridas, S. Kanwar, R. S. Pandey","doi":"10.5140/jass.2022.39.2.35","DOIUrl":"https://doi.org/10.5140/jass.2022.39.2.35","url":null,"abstract":"During their respective missions, the spacecraft Voyager and Cassini measured\u0000 several Saturn magnetosphere parameters at different radial distances. As a result of\u0000 information gathered throughout the journey, Voyager 1 discovered hot and cold electron\u0000 distribution components, number density, and energy in the 6–18 Rs range. Observations\u0000 made by Voyager of intensity fluctuations in the 20–30 keV range show electrons are\u0000 situated in the resonance spectrum’s high energy tail. Plasma waves in the magnetosphere\u0000 can be used to locate Saturn’s inner magnetosphere’s plasma clusters, which are\u0000 controlled by Saturn’s spin. Electromagnetic electron cyclotron (EMEC) wave ring\u0000 distribution function has been investigated. Kinetic and linear approaches have been\u0000 used to study electromagnetic cyclotron (EMEC) wave propagation. EMEC waves’ stability\u0000 can be assessed by analyzing the dispersion relation’s effect on the ring distribution\u0000 function. The primary goal of this study is to determine the impact of the magnetosphere\u0000 parameters which is observed by Cassini. The magnetosphere of Saturn has also been\u0000 observed. When the plasma parameters are increased as the distribution index, the\u0000 growth/damping rate increases until the magnetic field model affects the magnetic field\u0000 at equator, as can be seen in the graphs. We discuss the outputs of our model in the\u0000 context of measurements made in situ by the Cassini spacecraft.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"15 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86709333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Study of Double Dark Photons Produced by Lepton Colliders using High Performance Computing 轻子对撞机产生双暗光子的高性能计算研究
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2022-03-01 DOI: 10.5140/jass.2022.39.1.1
Kihong Park, Kyungho Kim, Kihyeon Cho
{"title":"A Study of Double Dark Photons Produced by Lepton Colliders using High Performance\u0000 Computing","authors":"Kihong Park, Kyungho Kim, Kihyeon Cho","doi":"10.5140/jass.2022.39.1.1","DOIUrl":"https://doi.org/10.5140/jass.2022.39.1.1","url":null,"abstract":"The universe is thought to be filled with not only Standard Model (SM) matters\u0000 but also dark matters. Dark matter is thought to play a major role in its construction.\u0000 However, the identity of dark matter is as yet unknown, with various search methods from\u0000 astrophysical observartion to particle collider experiments. Because of the\u0000 cross-section that is a thousand times smaller than SM particles, dark matter research\u0000 requires a large amount of data processing. Therefore, optimization and parallelization\u0000 in High Performance Computing is required. Dark matter in hypothetical hidden sector is\u0000 though to be connected to dark photons which carries forces similar to photons in\u0000 electromagnetism. In the recent analysis, it was studied using the decays of a dark\u0000 photon at collider experiments. Based on this, we studies double dark photon decays at\u0000 lepton colliders. The signal channels are e+e– → AʹAʹ and e+e– → AʹAʹγ where dark photon\u0000 Aʹ decays dimuon. These signal channels are based on the theory that dark photons only\u0000 decay into heavily charged leptons, which can explain the muon magnetic momentum\u0000 anomaly. We scanned the cross-section according to the dark photon mass in experiments.\u0000 MadGraph5 was used to generate events based on a simplified model. Additionally, to get\u0000 the maximum expected number of events for the double dark photon channel, the detector\u0000 efficiency for several center of mass (CM) energy were studied using Delphes and\u0000 MadAnalysis5 for performance comparison. The results of this study will contribute to\u0000 the search for double dark photon channels at lepton colliders.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"57 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74314750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Empirical Modeling of the Global Distribution of Magnetosonic Waves with Ambient Plasma Environment using Van Allen Probes 用范艾伦探针模拟等离子体环境下磁声波的全球分布
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2022-03-01 DOI: 10.5140/jass.2022.39.1.11
Kyung‐Chan Kim
{"title":"Empirical Modeling of the Global Distribution of Magnetosonic Waves with Ambient\u0000 Plasma Environment using Van Allen Probes","authors":"Kyung‐Chan Kim","doi":"10.5140/jass.2022.39.1.11","DOIUrl":"https://doi.org/10.5140/jass.2022.39.1.11","url":null,"abstract":"It is suggested that magnetosonic waves (also known as equatorial noise) can\u0000 scatter radiation belt electrons in the Earth’s magnetosphere. Therefore, it is\u0000 important to understand the global distribution of these waves between the proton\u0000 cyclotron frequency and the lower hybrid resonance frequency. In this study, we\u0000 developed an empirical model for estimating the global distribution of magnetosonic wave\u0000 amplitudes and wave normal angles. The model is based on the entire mission period\u0000 (approximately 2012–2019) of observations of Van Allen Probes A and B as a function of\u0000 the distance from the Earth (denoted by L*), magnetic local time (MLT), magnetic\u0000 latitude (λ), and geomagnetic activity (denoted by the Kp index). In previous studies\u0000 the wave distribution inside and outside the plasmasphere were separately investigated\u0000 and modeled. Our model, on the other hand, identifies the wave distribution along with\u0000 the ambient plasma environment—defined by the ratio of the plasma frequency (fpe) to the\u0000 electron cyclotron frequency (fce)—without separately determining the wave distribution\u0000 according to the plasmapause location. The model results show that, as Kp increases, the\u0000 dayside wave amplitude in the equatorial region intensifies. It thereby propagates the\u0000 intense region towards the wider MLT and inward to L* < 4. In contrast, the fpe/fce\u0000 ratio decreases with increasing Kp for all regions. Nevertheless, the decreasing aspect\u0000 differs between regions above and below L* = 4. This finding implies that the particle\u0000 energy and pitch angle that magnetosonic waves can effectively scatter vary depending on\u0000 the locations and geomagnetic activity. Our model agrees with the statistically observed\u0000 wave distribution and ambient plasma environment with a coefficient of determination of\u0000 > 0.9. The model is valid in all MLTs, 2 ≤ L* < 6, |λ| < 20°, and Kp ≤ 6.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"43 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86477933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observations of the Aurora by Visible All-Sky Camera at Jang Bogo Station, Antarctica 南极张伯戈站可见光全天空照相机对极光的观测
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-12-01 DOI: 10.5140/jass.2021.38.4.203
G. Jee, Young-bae Ham, Y. Choi, Eunsol Kim, Changsup Lee, H. Kwon, T. Trondsen, Ji Eun Kim, Jeong‐Han Kim
{"title":"Observations of the Aurora by Visible All-Sky Camera at Jang Bogo Station,\u0000 Antarctica","authors":"G. Jee, Young-bae Ham, Y. Choi, Eunsol Kim, Changsup Lee, H. Kwon, T. Trondsen, Ji Eun Kim, Jeong‐Han Kim","doi":"10.5140/jass.2021.38.4.203","DOIUrl":"https://doi.org/10.5140/jass.2021.38.4.203","url":null,"abstract":"The auroral observation has been started at Jang Bogo Station (JBS), Antarctica\u0000 by using a visible All-sky camera (v-ASC) in 2018 to routinely monitor the aurora in\u0000 association with the simultaneous observations of the ionosphere, thermosphere and\u0000 magnetosphere at the station. In this article, the auroral observations are introduced\u0000 with the analysis procedure to recognize the aurora from the v-ASC image data and to\u0000 compute the auroral occurrences and the initial results on their spatial and temporal\u0000 distributions are presented. The auroral occurrences are mostly confined to the northern\u0000 horizon in the evening sector and extend to the zenith from the northwest to cover\u0000 almost the entire sky disk over JBS at around 08 MLT (magnetic local time; 03 LT) and\u0000 then retract to the northeast in the morning sector. At near the magnetic local noon,\u0000 the occurrences are horizontally distributed in the northern sky disk, which shows the\u0000 auroral occurrences in the cusp region. The results of the auroral occurrences indicate\u0000 that JBS is located most of the time in the polar cap near the poleward boundary of the\u0000 auroral oval in the nightside and approaches closer to the oval in the morning sector.\u0000 At around 08 MLT (03 LT), JBS is located within the auroral oval and then moves away\u0000 from it, finally being located in the cusp region at the magnetic local noon, which\u0000 indicates that the location of JBS turns out to be ideal to investigate the\u0000 variabilities of the poleward boundary of the auroral oval from long-term observations\u0000 of the auroral occurrences. The future plan for the ground auroral observations near JBS\u0000 is presented.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"5 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74715047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Investigation of the Jets of the Blazar 3C 279 with Korean VLBI Network (KVN) 22–129 GHz Observations 利用韩国VLBI网络(KVN) 22-129 GHz观测对Blazar 3C 279喷流的研究
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-12-01 DOI: 10.5140/jass.2021.38.4.193
Sungmin Yoo, Sang-Sung Lee, Sang-Hyun Kim, H. An
{"title":"Investigation of the Jets of the Blazar 3C 279 with Korean VLBI Network (KVN)\u0000 22–129 GHz Observations","authors":"Sungmin Yoo, Sang-Sung Lee, Sang-Hyun Kim, H. An","doi":"10.5140/jass.2021.38.4.193","DOIUrl":"https://doi.org/10.5140/jass.2021.38.4.193","url":null,"abstract":"We present analysis results of Korean VLBI Network (KVN) four-band data for the\u0000 highly variable blazar 3C 279. We measured the 22, 43, 86, and 129 GHz flux densities\u0000 and spectral indices of the source using contemporaneous data taken over 5.6 years. We\u0000 used the discrete correlation function to investigate correlations between the radio\u0000 emission properties and those measured in the optical (2 × 1014 – 1.5 × 1015 Hz), X-ray\u0000 (0.3–10 keV), and gamma-ray (0.1–300 GeV) bands. We found a significant correlation\u0000 between the radio spectral index and gamma-ray flux without a time delay and interpreted\u0000 the correlation using an extended jet scenario for blazar emission.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"20 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85850795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characteristics of Horizontal Winds in the Mesosphere and Lower Thermosphere Region over Korean Peninsula Observed from the Korea Astronomy and Space Science Institute Meteor Radar 韩国天文空间研究所流星雷达观测的朝鲜半岛上空中层和下层热层水平风的特征
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-12-01 DOI: 10.5140/jass.2021.38.4.229
H. Kam, Y. Kwak, Tae-Yong Yang, Y. Kim, Jeongheon Kim, Jaewook Lee, Seonghwan Choi, J. Baek
{"title":"Characteristics of Horizontal Winds in the Mesosphere and Lower Thermosphere Region\u0000 over Korean Peninsula Observed from the Korea Astronomy and Space Science Institute\u0000 Meteor Radar","authors":"H. Kam, Y. Kwak, Tae-Yong Yang, Y. Kim, Jeongheon Kim, Jaewook Lee, Seonghwan Choi, J. Baek","doi":"10.5140/jass.2021.38.4.229","DOIUrl":"https://doi.org/10.5140/jass.2021.38.4.229","url":null,"abstract":"We present for the first time the characteristics of upper atmospheric horizontal\u0000 winds over the Korean Peninsula. Winds and their variability are derived using four-year\u0000 measurements by the Korea Astronomy and Space Science Institute (KASI) meteor radar. A\u0000 general characteristic of zonal and meridional winds is that they exhibit distinct\u0000 diurnal and seasonal variations. Their changes indicate sometimes similar or sometimes\u0000 different periodicities. Both winds are characterized by either semi-diurnal tides (12\u0000 hour period) and/or diurnal tides (24 hour period) from 80–100 km. In terms of annual\u0000 change, the annual variation is the strongest component in both winds, but semi-annual\u0000 and ter-annual variations are only detected in zonal winds.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"23 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78522281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Development of a New Pressure-Sinkage Model for Rover Wheel-Lunar Soil Interaction based on Dimensional Analysis and Bevameter Tests 基于量纲分析和测试的月球车车轮-月壤相互作用压力沉降模型的建立
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-12-01 DOI: 10.5140/jass.2021.38.4.237
Yujin Lim, V. Le, Pierre Anthyme Bahati
{"title":"Development of a New Pressure-Sinkage Model for Rover Wheel-Lunar Soil Interaction\u0000 based on Dimensional Analysis and Bevameter Tests","authors":"Yujin Lim, V. Le, Pierre Anthyme Bahati","doi":"10.5140/jass.2021.38.4.237","DOIUrl":"https://doi.org/10.5140/jass.2021.38.4.237","url":null,"abstract":"A rover is a planetary surface exploration device designed to move across the\u0000 ground on a planet or a planetary-like body. Exploration rovers are increasingly\u0000 becoming a vital part of the search for scientific evidence and discoveries on a\u0000 planetary satellite of the Sun, such as the Moon or Mars. Reliable behavior and\u0000 predictable locomotion of a rover is important. Understanding soil behavior and its\u0000 interaction with rover wheels—the terramechanics—is of great importance in rover\u0000 exploration performance. Up to now, many researchers have adopted Bekker’s semiempirical\u0000 model to predict rover wheelsoil interaction, which is based on the assumption that soil\u0000 is deformable when a pressure is applied to it. Despite this basic assumption of the\u0000 model, the pressure-sinkage relation is not fully understood, and it continues to\u0000 present challenges for rover designers. This article presents a new pressure-sinkage\u0000 model based on dimensional analysis (DA) and results of bevameter tests. DA was applied\u0000 to the test results in order to propose a new pressure-sinkage model by reducing\u0000 physical quantitative parameters. As part of the work, a new bevameter was designed and\u0000 built so that it could be successfully used to obtain a proper pressure-sinkage relation\u0000 of Korean Lunar Soil Simulant (KLS-1). The new pressure-sinkage model was constructed by\u0000 using three different sizes of flat plate diameters of the bevameter. The newly proposed\u0000 model was compared successfully with other models for validation purposes.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"7 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87052472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of Regional Coverage Low Earth Orbit (LEO) Constellation with Optimal Inclination 具有最佳倾角的区域覆盖低地球轨道星座设计
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-12-01 DOI: 10.5140/jass.2021.38.4.217
Jin-Hui Shin, Sang-Young Park, Jihae Son, S. Song
{"title":"Design of Regional Coverage Low Earth Orbit (LEO) Constellation with Optimal\u0000 Inclination","authors":"Jin-Hui Shin, Sang-Young Park, Jihae Son, S. Song","doi":"10.5140/jass.2021.38.4.217","DOIUrl":"https://doi.org/10.5140/jass.2021.38.4.217","url":null,"abstract":"In this study, we describe an analytical process for designing a low Earth orbit\u0000 constellation for discontinuous regional coverage, to be used for a surveillance and\u0000 reconnaissance space mission. The objective of this study was to configure a satellite\u0000 constellation that targeted multiple areas near the Korean Peninsula. The constellation\u0000 design forms part of a discontinuous regional coverage problem with a minimum revisit\u0000 time. We first introduced an optimal inclination search algorithm to calculate the\u0000 orbital inclination that maximizes the geometrical coverage of single or multiple ground\u0000 targets. The common ground track (CGT) constellation pattern with a repeating period of\u0000 one nodal day was then used to construct the rest of the orbital elements of the\u0000 constellation. Combining these results, we present an analytical design process that\u0000 users can directly apply to their own situation. For Seoul, for example, 39.0° was\u0000 determined as the optimal orbital inclination, and the maximum and average revisit times\u0000 were 58.1 min and 27.9 min for a 20-satellite constellation, and 42.5 min and 19.7 min\u0000 for a 30-satellite CGT constellation, respectively. This study also compares the revisit\u0000 times of the proposed method with those of a traditional Walker-Delta constellation\u0000 under three inclination conditions: optimal inclination, restricted inclination by\u0000 launch trajectories from the Korean Peninsula, and inclination for the sun-synchronous\u0000 orbit. A comparison showed that the CGT constellation had the shortest revisit times\u0000 with a non-optimal inclination condition. The results of this analysis can serve as a\u0000 reference for determining the appropriate constellation pattern for a given inclination\u0000 condition.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"27 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88968170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Practical Algorithms on Lunar Reference Frame Transformations for Korea Pathfinder Lunar Orbiter Flight Operation 韩国探路者月球轨道飞行器运行中月球参照系变换的实用算法
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-09-01 DOI: 10.5140/jass.2021.38.3.185
Young-Joo Song, Donghun Lee, Young-Rok Kim, Jonghee Bae, Jae-ik Park, Seung-Su Hong, Dae-Kwan Kim, Sang-Ryool Lee
{"title":"Practical Algorithms on Lunar Reference Frame Transformations for Korea Pathfinder\u0000 Lunar Orbiter Flight Operation","authors":"Young-Joo Song, Donghun Lee, Young-Rok Kim, Jonghee Bae, Jae-ik Park, Seung-Su Hong, Dae-Kwan Kim, Sang-Ryool Lee","doi":"10.5140/jass.2021.38.3.185","DOIUrl":"https://doi.org/10.5140/jass.2021.38.3.185","url":null,"abstract":"This technical paper deals the practical transformation algorithms between\u0000 several lunar reference frames which will be used for Korea pathfinder lunar orbiter\u0000 (KPLO) flight operation. Despite of various lunar reference frame definitions already\u0000 exist, use of a common transformation algorithm while establishing lunar reference frame\u0000 is very important for all members related to KPLO mission. This is because use of slight\u0000 different parameters during frame transformation may result significant misleading while\u0000 reprocessing data based on KPLO flight dynamics. Therefore, details of practical\u0000 transformation algorithms for the KPLO mission specific lunar reference frames is\u0000 presented with step by step implementation procedures. Examples of transformation\u0000 results are also presented to support KPLO flight dynamics data user community which is\u0000 expected to give practical guidelines while post processing the data as their needs.\u0000 With this technical paper, common understandings of reference frames that will be used\u0000 throughout not only the KPLO flight operation but also science data reprocessing can be\u0000 established. It is expected to eliminate, or at least minimize, unnecessary confusion\u0000 among all of the KPLO mission members including: Korea Aerospace Research Institute\u0000 (KARI), National Aeronautics and Space Administration (NASA) as well as other\u0000 organizations participating in KPLO payload development and operation, or further lunar\u0000 science community world-wide who are interested in KPLO science data post processing.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"8 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89367684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Evaluation of a Laser Altimeter using the Pseudo-Random Noise Modulation Technique for Apophis Mission 用伪随机噪声调制技术对阿波菲斯任务激光高度计的评价
IF 0.5
Journal of Astronomy and Space Sciences Pub Date : 2021-09-01 DOI: 10.5140/jass.2021.38.3.165
H. Lim, Ki-Pyoung Sung, Mansoo Choi, J. Park, C. Choi, S. Bang, Young‐Jun Choi, H. Moon
{"title":"Evaluation of a Laser Altimeter using the Pseudo-Random Noise Modulation Technique\u0000 for Apophis Mission","authors":"H. Lim, Ki-Pyoung Sung, Mansoo Choi, J. Park, C. Choi, S. Bang, Young‐Jun Choi, H. Moon","doi":"10.5140/jass.2021.38.3.165","DOIUrl":"https://doi.org/10.5140/jass.2021.38.3.165","url":null,"abstract":"Apophis is a near-Earth object with a diameter of approximately 340 m, which will\u0000 come closer to the Earth than a geostationary orbit in 2029, offering a unique\u0000 opportunity for characterizing the object during the upcoming encounter. Therefore,\u0000 Korea Astronomy and Space Science Institute has a plan to propose a space mission to\u0000 explore the Apophis asteroid using scientific instruments such as a laser altimeter. In\u0000 this study, we evaluate the performance metrics of a laser altimeter using a\u0000 pseudorandom noise modulation technique for the Apophis mission, in terms of detection\u0000 probability and ranging accuracy. The closed-form expression of detection probability is\u0000 provided using the cross correlation between the received pulse trains and pseudo-random\u0000 binary sequence. And the new ranging accuracy model using Gaussian error propagation is\u0000 also derived by considering the sampling rate. The operation range is significantly\u0000 limited by thermal noise rather than background noise, owing to not only the low power\u0000 laser but also the avalanche photodiode in the analog mode operation. However, it is\u0000 demonstrated from the numerical simulation that the laser altimeter can achieve the\u0000 ranging performance required for a proximity operation mode, which employs commercially\u0000 available components onboard CubeSat-scale satellites for optical communications.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":"469 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77498959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信