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同波束VLBI在采样返回式多目标探测器精密测轨测位中的应用 被引量:15
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作者 刘庆会 陈明 +7 位作者 Sander Goossens 菊池冬彦 松本晃治 平劲松 王广利 郑为民 花田英夫 洪晓瑜 《中国科学:物理学、力学、天文学》 CSCD 北大核心 2010年第6期809-818,共10页
同波束VLBI即用射电望远镜的主波束同时观测角距很小的两个探测器发出的巧妙配置的多频点信标,据此得到两探测器在两个测站间的误差为皮秒量级的差分相位时延.在月球卫星SELENE的两个小卫星Rstar和Vstar的测定轨中,利用40多分钟的同波束... 同波束VLBI即用射电望远镜的主波束同时观测角距很小的两个探测器发出的巧妙配置的多频点信标,据此得到两探测器在两个测站间的误差为皮秒量级的差分相位时延.在月球卫星SELENE的两个小卫星Rstar和Vstar的测定轨中,利用40多分钟的同波束VLBI和测速测距数据数小时的短弧定轨精度已显著提高,而一年多的定轨结果表明弧长数天的长弧定轨精度已达10m左右,充分证明了同波束VLBI在多目标卫星精密测定轨中的作用.本文在介绍SELENE同波束VLBI观测、多普勒数据处理和定轨结果的基础上,以用于月球采样返回探测任务中的多目标探测器如轨道器、着陆器和返回器为例,给出各探测器搭载电波源的信标设计方案及设计原则,并分析S频段多频点同波束VLBI技术在轨道器和着陆器绕月飞行、着陆器月球软着陆、着陆器月球采样、返回器从月面上升、返回器多次变轨、特别是轨道器和返回器交会对接等各个测控段的高精度测定轨或测定位及月球重力场探测中的应用. 展开更多
关键词 同波束VLBI 差分相位时延 多目标探测器 精密定轨 重力场探测
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Research on the Strategy of Underwater United Detection Fusion and Communication Using Multi-sensor
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作者 Zhenhua Xu Jianguo Huang Hai Huang Qunfei Zhang 《Journal of Marine Science and Application》 2011年第3期358-363,共6页
In order to solve the distributed detection fusion problem of underwater target detection, when the signal to noise ratio (SNR) of the acoustic channel is low, a new strategy for united detection fusion and communicat... In order to solve the distributed detection fusion problem of underwater target detection, when the signal to noise ratio (SNR) of the acoustic channel is low, a new strategy for united detection fusion and communication using multiple sensors was proposed. The performance of detection fusion was studied and compared based on the Neyman-Pearson principle when the binary phase shift keying (BPSK) and on-off keying (OOK) modes were used by the local sensors. The comparative simulation and analysis between the optimal likelihood ratio test and the proposed strategy was completed, and both the theoretical analysis and simulation indicate that using the proposed new strategy could improve the detection performance effectively. In theory, the proposed strategy of united detection fusion and communication is of great significance to the establishment of an underwater target detection system. 展开更多
关键词 detection fusion likelihood ratio test(LRT) Neyman-Pearson (NP) low signal to noise ratio
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