2021 7th International Conference on Space Science and Communication (IconSpace)最新文献_第4页

Investigation on Zonal Width of Low-Latitude F-Layer Irregularities in the South of China Based on C/N0 Observations from BDS GEO Satellites 基于BDS GEO卫星C/N0观测的中国南方低纬度f层不规则纬向宽度研究

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768681

Zhiyang Lu, Yuhua Zou

{"title":"Investigation on Zonal Width of Low-Latitude F-Layer Irregularities in the South of China Based on C/N0 Observations from BDS GEO Satellites","authors":"Zhiyang Lu, Yuhua Zou","doi":"10.1109/iconspace53224.2021.9768681","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768681","url":null,"abstract":"Statistical analysis was carried out in this work to estimate the zonal width (ZW) of low-latitude F-layer irregularities in the South of China by utilizing the 1-Hz carrier-to-noise density ratio (C/N0) measurements of the B1I signals of the BeiDou Navigation Satellite System (BDS) geostationary earth orbit (GEO) satellites (i.e., C01–C04) gathered by two adjacent geodetic Global Navigation Satellite System (GNSS) receivers. We analyzed the C/N0 measurements obtained at HKCL (22.296°N, 113.908°E) and HKQT (22.291°N, 114.213°E) sites during April 2014–April 2015. The two sites are equipped with the geodetic GNSS receiver Trimble NetR9 and are located nearly along the zonal (i.e., east-west) direction with a distance of ~31.38 km. Our statistical results showed that the occurrence rate of the events in which ZW < 24 km, 24 km ≤ ZW < 284 km, and 284 km ≤ ZW < 568 km was ~2%, ~44%, and ~54%, respectively. Our statistical results were in agreement with those of previous studies. Moreover, this investigation proved the viability of the approach, which deduces the zonal width of low-latitude F-layer irregularities by utilizing the 1-Hz C/N0 data of the B1I signals of the BDS GEO satellites gathered by two adjacent GNSS receivers.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117196479","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

Performance Comparison between Polyester and Denim Textile Antenna on Non-Identical Human Upper Arm Sizes for 5G mid-band 5G中频不同人体上臂尺寸聚酯与牛仔织物天线性能比较

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768724

Shehab Khan Noor, N. Ramli, N. Rahman, Mohd Najib Mohd Yasin

{"title":"Performance Comparison between Polyester and Denim Textile Antenna on Non-Identical Human Upper Arm Sizes for 5G mid-band","authors":"Shehab Khan Noor, N. Ramli, N. Rahman, Mohd Najib Mohd Yasin","doi":"10.1109/iconspace53224.2021.9768724","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768724","url":null,"abstract":"The usage of the textile antenna for diverse applications have been empowered by the miniaturization of wireless systems for the Fifth-generation technology (5G), and it has become one of the world's fastest developing technologies presently. However, the textile antenna when placed on human body goes through different bending and its performance gets altered. This paper presents design of two different textile antenna using polyester and denim as the substrate materials, where the radiating element and the ground is made from copper tape. The comparative study of polyester and denim textile antenna under various bending conditions due to non-identical human upper arm sizes (large, medium and small) for 5G mid band frequency has been analyzed. The analysis is presented comparatively from the simulated and optimized result using Computer Simulated Technology (CST) which focuses on the value of gain, antenna efficiency, bandwidth and directivity. It has been observed that denim textile antenna has covered desired frequency of 3.5 GHz with bandwidth of 140 MHz to 154.7 MHz in all the different bending conditions. Moreover, denim textile antenna obtained gain value above 2 dB in all the conditions. For polyester textile antenna, although it has covered 3.5 GHz during flat condition however as the bending angle increased, its resonance frequency shifted away from 3.5 GHz with insufficient bandwidth and low gain. At extreme bending of 72°, for both the antennas, there was frequency shifting in lower bands by 88.9 MHz (2.54%) for denim while it was 148.5 MHz (4.2%) for polyester.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123314217","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

Experimental Setup for Markerless Motion Capture and Landmarks Detection using OpenPose During Dynamic Gait Index Measurement 基于OpenPose的无标记运动捕捉与动态步态指标检测实验研究

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768699

Normurniyati Abd Shattar, K. B. Gan, Noor Syazwana Abd Aziz

{"title":"Experimental Setup for Markerless Motion Capture and Landmarks Detection using OpenPose During Dynamic Gait Index Measurement","authors":"Normurniyati Abd Shattar, K. B. Gan, Noor Syazwana Abd Aziz","doi":"10.1109/iconspace53224.2021.9768699","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768699","url":null,"abstract":"The majority of motion analysis tools used in sports biomechanics and rehabilitation do not provide autonomous kinematic data collection without the use of markers, experimental settings, or extensive processing durations. These limits can make it difficult to employ motion capture in routine training or rehabilitation situations and there is an evident need for the development of automated markerless systems. It is vital to select the right technical equipment and algorithms for accurate markerless motion capture. This paper discusses the markerless human motion capture method for landmark detection using the open-source library OpenPose during the Modified Dynamic Gait Index (m-DGI) assessment. The m-DGI research covered the following phases: gait level surface, change in gait speed, gait with horizontal head turns and gait with vertical head turns. The four stages in m-DGI were captured using two Canon EOS 90D DSLR cameras. The videos were recorded in frontal and side views (subjects moved toward the front camera) and the source code of OpenPose's human skeleton identification system can extract the image into a sequence of frames from the recorded video. This method processes every frame of extracted images in OpenCV-Python to detect the human skeleton key points. The application of this methodology in research and clinical practice has the potential to provide easy, time-efficient, and perhaps more relevant assessments of human mobility.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127071443","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: 3

A Proposed Cognitive Radio to Minimize the Sensing Time for High Frequency Receivers Based on Neural Network 一种基于神经网络的高频接收机感知时间最小化的认知无线电

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768717

A. Thabit

{"title":"A Proposed Cognitive Radio to Minimize the Sensing Time for High Frequency Receivers Based on Neural Network","authors":"A. Thabit","doi":"10.1109/iconspace53224.2021.9768717","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768717","url":null,"abstract":"Cognitive radio (CR) is the exciting emerging technology that has the ability to deal with the requirements of the frequency spectrum. This new technology illustrates new developments in communications systems, because CR allows usage of the frequency spectrum more efficiently. As an example of the challenges related to CR system is the detection of the founded authorized users (PU) over a large range of frequency band at a precise time called sensing time (Ts). To increase the detection reliability of the primary users at minimum sensing time, an adaptive CR system have been built in this work based on neural network to identify if signal or noise. The system consists of feature extraction and decision stages was designed with help of Numeral Virtual Generalizing RAM (NVG-RAM) weightless neural network (WNN). Obtained simulation results of the proposed system are tested at different noisy channels: as AWGN and fading channels (Rayleigh and Rician). The results shows that probability of detection (Pd)=100% at -38 dB. at very low sensing time equal to 0.4 msec. A novel technique is also presented to estimate SNR for CR by statistical features by calculation the moment and cumulants for different modulated noisy signals. This is an indirect method for SNR measurements based on statistical features.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121623459","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

Preliminary Design and Simulation of the Electrical Power System for a CubeSat Using LTspice 基于LTspice的立方体卫星电力系统初步设计与仿真

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768770

Peeyush Kumar, K. S, Ankith D H, Guru Kiran Prabhu, D. S, R. Geetha

{"title":"Preliminary Design and Simulation of the Electrical Power System for a CubeSat Using LTspice","authors":"Peeyush Kumar, K. S, Ankith D H, Guru Kiran Prabhu, D. S, R. Geetha","doi":"10.1109/iconspace53224.2021.9768770","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768770","url":null,"abstract":"Space industry is on a rise and satellites are being used in plethora of applications. Smaller satellites such as Cube-Sats and Nano-satellites are turning out to be extremely useful for research purposes as they are cost and space effective. In order to support and promote space research in academic institutions, student satellite projects are being encouraged. These projects help students to work closely with space industry professionals in order to gain knowledge about satellites and their functioning. However a satellite consists of different components each one of which has a different design approach and require different technical expertise. In this paper a preliminary approach for designing an Electrical Power System for a CubeSat is proposed along with modelling and simulation of the same in LTspice which is a spice based simulation software. Complete Electrical Power System has been designed for both Direct Energy Transfer and Maximum Power Point Tracking type architectures and simulation results for the same have been presented.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116811115","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

Comparative Study of Peak to Average Power Ratio in OFDM and FBMC Systems OFDM和FBMC系统中峰值平均功率比的比较研究

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768772

Ali AbdulHussein, H. Abdullah

引用次数: 3

Energy Extraction Using Thermoelectric Generator from Solar Array Arcing in Space Applications 利用热电发电机从太阳能阵列电弧中提取能量在空间中的应用

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768741

Mir Ashib Ullah, Muntaha Rahman, Qazi Mahabub-A-Rabbani, Fahim Abid

{"title":"Energy Extraction Using Thermoelectric Generator from Solar Array Arcing in Space Applications","authors":"Mir Ashib Ullah, Muntaha Rahman, Qazi Mahabub-A-Rabbani, Fahim Abid","doi":"10.1109/iconspace53224.2021.9768741","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768741","url":null,"abstract":"Solar array arcing due to spacecraft charging results in an efficiency loss of solar arrays installed in satellites. In this paper, energy extraction potential from a primary arc up to 0.2 A of 4 µs duration initiated at a triple junction has been investigated using a thermoelectric generator module. The temperature of the primary arc is calculated to be 3901.70 K and considered as the hot end temperature of the module. A hybridized model of a unit thermoelectric generator module is analyzed using COMSOL Multiphysics 5.3a. Considering a cold end temperature of 325.45 K during the eclipse, the TEG yields a maximum output power of 64.74 mW for an arc current of 0.2 A at a single triple junction. Over its entire duration of 4 µs, the instantaneous power generated by a thermoelectric generator has been calculated. Finally, by employing this model on a typical geostationary satellite, e.g. WINDS GEO satellite, the total energy harvested is calculated to be 3.13 mJ for approximately 26774 arcs on its 8760 triple junctions over its lifespan of 11 years. Although the total harvested energy is not significant for geostationary satellites, this energy can be used in low power applications where frequent arcing occurs.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128835053","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

Feature Extraction of GNSS Signals Based on Signal Processing Techniques for Land Deformation Detection 基于信号处理技术的GNSS信号特征提取

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768725

N. Khamisan, Kamarul Hawari bin Ghazali, Xu Jiang

{"title":"Feature Extraction of GNSS Signals Based on Signal Processing Techniques for Land Deformation Detection","authors":"N. Khamisan, Kamarul Hawari bin Ghazali, Xu Jiang","doi":"10.1109/iconspace53224.2021.9768725","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768725","url":null,"abstract":"The Global Navigation Satellite System (GNSS) refers to a constellation of satellites that provide position and time signals from space that allow a receiver to determine location. These GNSS signals can be used to determine the position and time of an object such as a human, a vehicle, and many other objects. Moreover, in this study, GNSS signals were used to determine the soil geophysical movement based on the signal positioning of the receiver station. A signal processing method has been applied to find the best feature extraction method for normal and abnormal signal classification. A set of GNSS signals has been acquired from a land deformation monitoring station in China that contains 3 months of the continuous GNSS signal. The signal is then processed and extracted using time series analysis and statistical approach to determine the normal and abnormality of the soil movement. There were three (3) periodic terms involved in the GNSS signal processing which velocity, distance, and acceleration. These 3 properties were used to analyze the normal and abnormality of soil movement that will be contributed to a landslide. Finally, the experimental results have proved that the feature extraction method on GNSS signal was found to be able to produce significant features to detect normal and abnormal land deformation.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122030014","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

Performance of Sewed Textile Antenna for Biomedical Application at ISM Band ISM波段生物医学用缝织天线性能研究

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768734

Yoshi Magdalena Daeli, Levy Olivia Nur, R. Anwar

{"title":"Performance of Sewed Textile Antenna for Biomedical Application at ISM Band","authors":"Yoshi Magdalena Daeli, Levy Olivia Nur, R. Anwar","doi":"10.1109/iconspace53224.2021.9768734","DOIUrl":"https://doi.org/10.1109/iconspace53224.2021.9768734","url":null,"abstract":"Textile antenna is one type of antenna that can be used as a wearable antenna, which is specially designed to be integrated into clothing and accessories. This type of antenna can be applied in various fields, such as the health, social, rescue, and military fields. This paper presents the performance of textile antennas with cordura substrate operating at the ISM band frequency in free-space condition and on-body condition. The substrate uses cordura fabric, while the radiating element uses copper yarn stitches. This study discusses the results of the simulation and measurement of the textile antenna. Through the measurement results, the performance of the antenna in the free space condition is better than the on-body condition with a VSWR value of 1.12 and a gain of 5.82 dBi. In addition, the Specific Absorption Ratio (SAR) value of 1.15 W/kg was obtained which states that the antenna is safe for use on the body because it is below the safe threshold, which is 1.6 W/kg. From the data obtained, the proposed antenna has good performance in both conditions and can be used for biomedical applications.","PeriodicalId":378366,"journal":{"name":"2021 7th International Conference on Space Science and Communication (IconSpace)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116406263","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

Single Negative Matamaterial Absorber of K-Band Application k波段单负极材料吸收体的应用

2021 7th International Conference on Space Science and Communication (IconSpace) Pub Date : 2021-11-23 DOI: 10.1109/iconspace53224.2021.9768719

Md. Nurnobi Chowdhury Saddam, M. Baharuddin, M. L. Hakim, T. Alam, Ahmad Musa

引用次数: 0