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Light-weight High-power Lithium-ion Battery Technologies for Small SAR Satellite 小型SAR卫星轻量化大功率锂离子电池技术
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652242
Lei Gao, Yueni Mei, Guiting Yang, Honghui Gu, Ke Wang
{"title":"Light-weight High-power Lithium-ion Battery Technologies for Small SAR Satellite","authors":"Lei Gao, Yueni Mei, Guiting Yang, Honghui Gu, Ke Wang","doi":"10.23919/CISS51089.2021.9652242","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652242","url":null,"abstract":"Until now, the highest rate of lithium-ion battery for SAR satellite is 5 C. With the increasing requirements of light weight, related indicators can be achieved through improving rate performance and maintaining high specific energy. To meet this demand, light-weight high-power lithium-ion battery technologies for small SAR satellite have been systematically developed, including electrode active materials research, separators improvement, and electrolytes formula design. Using LiNi0.8Co0.15Al0.05O2 (NCA) materials possessing both energy and power performances as cathode materials, the design capacity of battery has been increased by 15.6% and 29%, respectively, compared with that of power lithium batteries using Li1+zNixMn1-x-yCoyO2 (NMC) and LiCoO2 (LCO) materials as cathodes. Through comparing the power performances of different types of graphite anode materials, it is found that the discharge voltage plateau under 10 C rate can be increased by 0.2 V by improving the specific capacity based on particle-size control. Besides, the effect of types of ceramic separator coating layer and separator substrates on the power performance of lithium battery has been studied. It is found that the discharge voltage plateau under 10C rate can be increased by 0.4 V and the power platform kept stable during the discharge process when dry-process polyolefin film as the substrate and Al2O3 as the ceramic coating were employed. Furthermore, for the bottleneck of poor high-temperature and cycling stability of NCA materials, the effects of several types of electrolytes on batteries’ high-rate discharge and rate cycling were compared and studied. In this study, high-power lithium-ion battery applied for small SAR satellite has been successfully prepared, exhibiting a specific capacity of 180 Wh/kg with continuous discharge capability of 10 C.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115663174","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
The Influence of SAR Satellite Load Boot on Power Converter and Its Analysis SAR卫星负载启动对功率变换器的影响及分析
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652301
Kehai Bao, Hou Li, Lu Gao, Ling-Yun Fan, Zhi-Hao Wan, Jin Xiao
{"title":"The Influence of SAR Satellite Load Boot on Power Converter and Its Analysis","authors":"Kehai Bao, Hou Li, Lu Gao, Ling-Yun Fan, Zhi-Hao Wan, Jin Xiao","doi":"10.23919/CISS51089.2021.9652301","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652301","url":null,"abstract":"The power startup of SAR satellite load has the characteristics of heavy power and high frequency instantaneous pulse power. For the configuration scheme of the non-modulation single-bus satellite power system, the heavy power and high frequency instantaneous pulse of the satellite SAR load will directly cause the voltage pulsation of the non-modulation bus, resulting in the unstable input voltage of the platform bus converter. Base on the analysis of satellite load power demand under different mode and the load current value, evaluate the influence of satellite load of heavy power and high frequency pulse on platform bus converter. On the platform power converter input set filter unit, through the simulation analysis and verification of actual circuit, the filter unit can effectively control bus converter input voltage ripple within 2%, to ensure the reliability of the power supply system and power converter.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123799588","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
Design of an ultra-wideband power divider 一种超宽带功率分配器的设计
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652224
Jingjing Yang, Xiaowei Shen, Hanbing Luo, Hongying Zhang, Zhenbin Tu
{"title":"Design of an ultra-wideband power divider","authors":"Jingjing Yang, Xiaowei Shen, Hanbing Luo, Hongying Zhang, Zhenbin Tu","doi":"10.23919/CISS51089.2021.9652224","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652224","url":null,"abstract":"An UWB power divider with the frequency range from 2GHz to 8GHz is designed by using multi-class Wilkinson structure in this paper. The ADS and HFSS software are both used to simulate and optimize the power divider. A prototype of the power divider was fabricated and measured, the results of the simulation approximately coincide with the divider testing. The experimental results show excellent performance that the insertion loss is less than 3.5 dB, the port return loss is less than -15dB, and the isolation is more than 20 dB in the operating frequency band．","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126779743","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
Nearshore Ship Detection on SAR Image Based on Yolov5 基于Yolov5的SAR图像近岸船舶检测
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652233
Qiang Fu, Jie Chen, Wei Yang, Shichao Zheng
{"title":"Nearshore Ship Detection on SAR Image Based on Yolov5","authors":"Qiang Fu, Jie Chen, Wei Yang, Shichao Zheng","doi":"10.23919/CISS51089.2021.9652233","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652233","url":null,"abstract":"Nearshore ship detection faces big challenge due to the missing alarms and false alarms caused by onshore ship-like objects and close arrangement of ships. This paper proposes a method to detect nearshore ships, which is based on You Only Look Once Version 5 (Yolov5). To improve the precision, attention model and Circle Smooth Label (CSL) are unified into the detection network. The main research content and experimental work of this paper are as follows. First, Yolov5 network, attention model and CSL algorithm are analyzed. After that, the detection experiment is carried out based on Yolov5. Next, the attention model is introduced to improve the network. Then, combined with the CSL algorithm, the Yolov5 rotation detection network is reconstructed. Finally, by adjusting the training parameters and improving the attention, the test result of the detection network for inshore targets reached mAP above 80%, and the feasibility of the CSL+Yolov5 algorithm to achieve rotation detection is confirmed.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114883307","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: 5
Design of an X-Ku band Low Noise Amplifier X-Ku波段低噪声放大器的设计
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652284
Yafei Shen, Fang Yan, Zhenhao Wang, Kang Min, Xiaoyu Chen
{"title":"Design of an X-Ku band Low Noise Amplifier","authors":"Yafei Shen, Fang Yan, Zhenhao Wang, Kang Min, Xiaoyu Chen","doi":"10.23919/CISS51089.2021.9652284","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652284","url":null,"abstract":"This paper presents the design and test of a low noise figure and high gain low noise amplifier (LNA) module at X-Ku band. In order to realize this kind of characteristic, a two-stage topology was used which the transistors used in this design are NE3210S01 manufactured by NEC. The matching circuit of input, output and interstage is designed with assistance of joint simulation of HFSS and ADS. The measured noise figure of the LNA is less than 1.2dB and the input and output VSWR is less than 2.0. Measured linear gain of the module is greater than 20dB over the a testing bandwidth of 2GHz at room temperature..","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115472918","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
High-resolution beamforming technology based on entropy dividing sub-array 基于熵分子阵列的高分辨率波束形成技术
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652295
Ping Wang, Jiwei Tang, Z. Ye, Jing Luo, Chenfan Zhao, Yiling Qin
{"title":"High-resolution beamforming technology based on entropy dividing sub-array","authors":"Ping Wang, Jiwei Tang, Z. Ye, Jing Luo, Chenfan Zhao, Yiling Qin","doi":"10.23919/CISS51089.2021.9652295","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652295","url":null,"abstract":"The use of sub-array processing method for large arrays can achieve better processing performance at a small cost. This paper proposes a high-resolution beamforming technique based on entropy dividing sub-arrays for uniform linear arrays. By establishing the entropy model, the effects of sub-array division technology and sub-array unit directivity on the output performance of the array are comprehensively considered.The performance of sub-array division technology on interference and clutter suppression is simulated and analyzed, and the mathematical solution method of optimal sub-array division is explored. The method is extended to the design of composite multi-band arrays to optimize the parasitic grating lobes caused by missing cells, providing theoretical support and engineering implementable algorithms for the development of large-scale array radars. Finally, the validity and feasibility of the proposed model are verified by experimental data.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116601079","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
Research on Internal Calibration Technology of Bi-satellite Ka-band FMCW SAR System 双星ka波段FMCW SAR系统内部定标技术研究
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652212
Lipeng Fu, Hui Wang, Shichao Zheng
{"title":"Research on Internal Calibration Technology of Bi-satellite Ka-band FMCW SAR System","authors":"Lipeng Fu, Hui Wang, Shichao Zheng","doi":"10.23919/CISS51089.2021.9652212","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652212","url":null,"abstract":"Compared with single-satellite SAR system, bi-satellite SAR system solves the problem of isolation, which makes it have better anti-interference performance. However, the transmitting and the receiving subsystems of bi-satellite SAR are equipped in different satellites, so the realization of internal calibration is the key issue to the bi-satellite SAR system. In this paper, the principle of realization and the design scheme of the internal calibration subsystem is proposed for a bi-satellite Ka-band FMCW SAR system. The comprising of the internal calibration system, working modes and principle, the realization of calibrating links and the design of calibrators are described, as well as the index parameters are given in the paper, proving the feasibility of design and realization on the internal calibration system for bi-satellite Ka-band FMCW SAR theoretically. The further study will go on to verify the effectiveness of the design scheme by testing the prototype devices of calibrators and the whole SAR system.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129618546","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
SAR image target recognition based on senet depth separable convolutional neural network 基于深度可分卷积神经网络的SAR图像目标识别
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652272
Shubin Mei, X. Wei, Biao Jin, Jiao Guo
{"title":"SAR image target recognition based on senet depth separable convolutional neural network","authors":"Shubin Mei, X. Wei, Biao Jin, Jiao Guo","doi":"10.23919/CISS51089.2021.9652272","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652272","url":null,"abstract":"To solve the problem of slow convergence speed","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128647583","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
SAR Muti-Channel Adaptive Equalization Method Based On Particle Swarm Optimization 基于粒子群优化的SAR多通道自适应均衡方法
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652195
Qing Yang, Zhuo Zhou, K. Du, Nianzhu Wen, Zhongyu Li, Junjie Wu
{"title":"SAR Muti-Channel Adaptive Equalization Method Based On Particle Swarm Optimization","authors":"Qing Yang, Zhuo Zhou, K. Du, Nianzhu Wen, Zhongyu Li, Junjie Wu","doi":"10.23919/CISS51089.2021.9652195","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652195","url":null,"abstract":"Multi-channel SAR system improves the suppression performance of the main lobe clutter by increasing the degree of spatial freedom. In actual project, channel mismatch will greatly reduce the performance of clutter suppression. How to eliminate the amplitude and phase errors between channels has become an important engineering problem. Aiming at the problem of inconsistent amplitude and phase between the receiving channels of bistatic multi-channel SAR systems, this paper proposes an adaptive channel equalization method with faster convergence speed and lower computational complexity. Firstly, analyze and model the channel mismatch by constructing the echo model of the bistatic multi-channel SAR. Then use the adaptive algorithm to complete the equalization processing of multi-channel echo signal, and propose a method of combining the particle swarm algorithm and the adaptive algorithms. Through simulation and experimental data verification, the adaptive channel equalization technology combined with particle swarm algorithm can compensate the relative error between channels more accurately and efficiently.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130393369","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
On the in-Orbit Time Synchronization Test Method for Distributed InSAR Satellites 分布式InSAR卫星在轨时间同步测试方法研究
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652382
Di Zhao, Yusheng Hou, Xizhi Chen, Yanyang Liu, Junli Chen
{"title":"On the in-Orbit Time Synchronization Test Method for Distributed InSAR Satellites","authors":"Di Zhao, Yusheng Hou, Xizhi Chen, Yanyang Liu, Junli Chen","doi":"10.23919/CISS51089.2021.9652382","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652382","url":null,"abstract":"This paper presents an in-orbit time synchronization test method for distributed interferometric synthetic aperture radar (InSAR). In this paper, starting from the construction planning of geometric calibration field, the test data of characteristic points are obtained by two-dimensional interpolation of SAR echo complex images, and the slant distance deviation of dual satellite SAR is calculated, so as to obtain the in-orbit test results of time synchronization. This method solves the technical problem that the time synchronization index of distributed InSAR satellite cannot be directly tested in-orbit. The test method has good adaptability, simple operation and high test accuracy, and is suitable for the time synchronization in-orbit test of distributed InSAR satellite under dual satellite (one transmitter and two receivers) system or multi satellite (one transmitter and multi receivers) system.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121169033","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
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